Microsoft Exchange Server Remote Code Execution Vulnerability
Priority CRITICAL 93Exploited in the wildCWE-502Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Microsoft. Impact type from Microsoft.
Summary
Microsoft Exchange Server Remote Code Execution Vulnerability
Why it matters now
Exploitation Active In CISA KEV since 2021-11-03CISA due date 2022-05-03Known ransomware use
EPSS 0.95762 99th percentileScored 2026-11-07
Fix Fixed Microsoft: 2 updates
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Active
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Microsoft | Microsoft Exchange Server 2010 Service Pack 3 | 14.0.0.0 to before 14.03.0513.000 | 14.03.0513.000 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2013 Cumulative Update 21 | 15.00.0 to before 15.00.1395.012 | 15.00.1395.012 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2013 Cumulative Update 22 | 15.00.0 to before 15.00.1473.006 | 15.00.1473.006 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2013 Cumulative Update 23 | 15.00.0 to before 15.00.1497.012 | 15.00.1497.012 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2013 Service Pack 1 | 15.00.0 to before 15.00.0847.064 | 15.00.0847.064 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 10 | 15.01.0 to before 15.01.1531.012 | 15.01.1531.012 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 11 | 15.01.0 to before 15.01.1591.018 | 15.01.1591.018 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 12 | 15.01.0 to before 15.01.1713.010 | 15.01.1713.010 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 13 | 15.01.0 to before 15.01.1779.008 | 15.01.1779.008 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 14 | 15.01.0 to before 15.01.1847.012 | 15.01.1847.012 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 15 | 15.01.0 to before 15.01.1913.012 | 15.01.1913.012 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 16 | 15.01.0 to before 15.01.1979.008 | 15.01.1979.008 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 17 | 15.01.0 to before 15.01.2044.013 | 15.01.2044.013 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 18 | 15.01.0 to before 15.01.2106.013 | 15.01.2106.013 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 19 | 15.01.0 to before 15.01.2176.009 | 15.01.2176.009 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 8 | 15.01.0 to before 15.01.1415.010 | 15.01.1415.010 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 9 | 15.01.0 to before 15.01.1466.016 | 15.01.1466.016 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2019 | 15.02.0 to before 15.02.0221.018 | 15.02.0221.018 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 1 | 15.02.0 to before 15.01.1979.006 | 15.01.1979.006 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 2 | 15.02.0 to before 15.02.0397.011 | 15.02.0397.011 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 3 | 15.02.0 to before 15.02.0464.015 | 15.02.0464.015 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 4 | 15.02.0 to before 15.02.0659.012 | 15.02.0659.012 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 5 | 15.02.0 to before 15.02.0595.008 | 15.02.0595.008 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 6 | 15.02.0 to before 15.02.0529.013 | 15.02.0529.013 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 7 | 15.02.0 to before 15.02.0721.013 | 15.02.0721.013 | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 8 | 15.02.0 to before 15.02.0792.010 | 15.02.0792.010 | Patch available | CNA |
- Microsoft Exchange Server 2010 Service Pack 3 VendorMicrosoft Affected 14.0.0.0 to before 14.03.0513.000 Fixed in 14.03.0513.000 Patch available CNA
- Microsoft Exchange Server 2013 Cumulative Update 21 VendorMicrosoft Affected 15.00.0 to before 15.00.1395.012 Fixed in 15.00.1395.012 Patch available CNA
- Microsoft Exchange Server 2013 Cumulative Update 22 VendorMicrosoft Affected 15.00.0 to before 15.00.1473.006 Fixed in 15.00.1473.006 Patch available CNA
- Microsoft Exchange Server 2013 Cumulative Update 23 VendorMicrosoft Affected 15.00.0 to before 15.00.1497.012 Fixed in 15.00.1497.012 Patch available CNA
- Microsoft Exchange Server 2013 Service Pack 1 VendorMicrosoft Affected 15.00.0 to before 15.00.0847.064 Fixed in 15.00.0847.064 Patch available CNA
- Microsoft Exchange Server 2016 Cumulative Update 10 VendorMicrosoft Affected 15.01.0 to before 15.01.1531.012 Fixed in 15.01.1531.012 Patch available CNA
- Microsoft Exchange Server 2016 Cumulative Update 11 VendorMicrosoft Affected 15.01.0 to before 15.01.1591.018 Fixed in 15.01.1591.018 Patch available CNA
- Microsoft Exchange Server 2016 Cumulative Update 12 VendorMicrosoft Affected 15.01.0 to before 15.01.1713.010 Fixed in 15.01.1713.010 Patch available CNA
- Microsoft Exchange Server 2016 Cumulative Update 13 VendorMicrosoft Affected 15.01.0 to before 15.01.1779.008 Fixed in 15.01.1779.008 Patch available CNA
- Microsoft Exchange Server 2016 Cumulative Update 14 VendorMicrosoft Affected 15.01.0 to before 15.01.1847.012 Fixed in 15.01.1847.012 Patch available CNA
- Microsoft Exchange Server 2016 Cumulative Update 15 VendorMicrosoft Affected 15.01.0 to before 15.01.1913.012 Fixed in 15.01.1913.012 Patch available CNA
- Microsoft Exchange Server 2016 Cumulative Update 16 VendorMicrosoft Affected 15.01.0 to before 15.01.1979.008 Fixed in 15.01.1979.008 Patch available CNA
- Microsoft Exchange Server 2016 Cumulative Update 17 VendorMicrosoft Affected 15.01.0 to before 15.01.2044.013 Fixed in 15.01.2044.013 Patch available CNA
- Microsoft Exchange Server 2016 Cumulative Update 18 VendorMicrosoft Affected 15.01.0 to before 15.01.2106.013 Fixed in 15.01.2106.013 Patch available CNA
- Microsoft Exchange Server 2016 Cumulative Update 19 VendorMicrosoft Affected 15.01.0 to before 15.01.2176.009 Fixed in 15.01.2176.009 Patch available CNA
- Microsoft Exchange Server 2016 Cumulative Update 8 VendorMicrosoft Affected 15.01.0 to before 15.01.1415.010 Fixed in 15.01.1415.010 Patch available CNA
- Microsoft Exchange Server 2016 Cumulative Update 9 VendorMicrosoft Affected 15.01.0 to before 15.01.1466.016 Fixed in 15.01.1466.016 Patch available CNA
- Microsoft Exchange Server 2019 VendorMicrosoft Affected 15.02.0 to before 15.02.0221.018 Fixed in 15.02.0221.018 Patch available CNA
- Microsoft Exchange Server 2019 Cumulative Update 1 VendorMicrosoft Affected 15.02.0 to before 15.01.1979.006 Fixed in 15.01.1979.006 Patch available CNA
- Microsoft Exchange Server 2019 Cumulative Update 2 VendorMicrosoft Affected 15.02.0 to before 15.02.0397.011 Fixed in 15.02.0397.011 Patch available CNA
- Microsoft Exchange Server 2019 Cumulative Update 3 VendorMicrosoft Affected 15.02.0 to before 15.02.0464.015 Fixed in 15.02.0464.015 Patch available CNA
- Microsoft Exchange Server 2019 Cumulative Update 4 VendorMicrosoft Affected 15.02.0 to before 15.02.0659.012 Fixed in 15.02.0659.012 Patch available CNA
- Microsoft Exchange Server 2019 Cumulative Update 5 VendorMicrosoft Affected 15.02.0 to before 15.02.0595.008 Fixed in 15.02.0595.008 Patch available CNA
- Microsoft Exchange Server 2019 Cumulative Update 6 VendorMicrosoft Affected 15.02.0 to before 15.02.0529.013 Fixed in 15.02.0529.013 Patch available CNA
- Microsoft Exchange Server 2019 Cumulative Update 7 VendorMicrosoft Affected 15.02.0 to before 15.02.0721.013 Fixed in 15.02.0721.013 Patch available CNA
- Microsoft Exchange Server 2019 Cumulative Update 8 VendorMicrosoft Affected 15.02.0 to before 15.02.0792.010 Fixed in 15.02.0792.010 Patch available CNA
CPE configurations NVD · 26
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:microsoft:exchange_server:2010:sp3:*:*:*:*:*:* | 2010 sp3 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_21:*:*:*:*:*:* | 2013 cumulative_update_21 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_22:*:*:*:*:*:* | 2013 cumulative_update_22 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:* | 2013 cumulative_update_23 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2013:sp1:*:*:*:*:*:* | 2013 sp1 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_10:*:*:*:*:*:* | 2016 cumulative_update_10 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_11:*:*:*:*:*:* | 2016 cumulative_update_11 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_12:*:*:*:*:*:* | 2016 cumulative_update_12 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_13:*:*:*:*:*:* | 2016 cumulative_update_13 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_14:*:*:*:*:*:* | 2016 cumulative_update_14 | Vulnerable | Microsoft |
- cpe:2.3:a:microsoft:exchange_server:2010:sp3:*:*:*:*:*:* Versions 2010 sp3 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_21:*:*:*:*:*:* Versions 2013 cumulative_update_21 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_22:*:*:*:*:*:* Versions 2013 cumulative_update_22 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:* Versions 2013 cumulative_update_23 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2013:sp1:*:*:*:*:*:* Versions 2013 sp1 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_10:*:*:*:*:*:* Versions 2016 cumulative_update_10 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_11:*:*:*:*:*:* Versions 2016 cumulative_update_11 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_12:*:*:*:*:*:* Versions 2016 cumulative_update_12 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_13:*:*:*:*:*:* Versions 2016 cumulative_update_13 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_14:*:*:*:*:*:* Versions 2016 cumulative_update_14 Vulnerable ·Microsoft
Show 16 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_15:*:*:*:*:*:* | 2016 cumulative_update_15 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_16:*:*:*:*:*:* | 2016 cumulative_update_16 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_17:*:*:*:*:*:* | 2016 cumulative_update_17 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_18:*:*:*:*:*:* | 2016 cumulative_update_18 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:* | 2016 cumulative_update_19 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_8:*:*:*:*:*:* | 2016 cumulative_update_8 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_9:*:*:*:*:*:* | 2016 cumulative_update_9 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2019:-:*:*:*:*:*:* | 2019 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_1:*:*:*:*:*:* | 2019 cumulative_update_1 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_2:*:*:*:*:*:* | 2019 cumulative_update_2 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_3:*:*:*:*:*:* | 2019 cumulative_update_3 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_4:*:*:*:*:*:* | 2019 cumulative_update_4 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_5:*:*:*:*:*:* | 2019 cumulative_update_5 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_6:*:*:*:*:*:* | 2019 cumulative_update_6 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_7:*:*:*:*:*:* | 2019 cumulative_update_7 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:* | 2019 cumulative_update_8 | Vulnerable | Microsoft |
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_15:*:*:*:*:*:* Versions 2016 cumulative_update_15 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_16:*:*:*:*:*:* Versions 2016 cumulative_update_16 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_17:*:*:*:*:*:* Versions 2016 cumulative_update_17 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_18:*:*:*:*:*:* Versions 2016 cumulative_update_18 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:* Versions 2016 cumulative_update_19 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_8:*:*:*:*:*:* Versions 2016 cumulative_update_8 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_9:*:*:*:*:*:* Versions 2016 cumulative_update_9 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2019:-:*:*:*:*:*:* Versions 2019 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_1:*:*:*:*:*:* Versions 2019 cumulative_update_1 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_2:*:*:*:*:*:* Versions 2019 cumulative_update_2 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_3:*:*:*:*:*:* Versions 2019 cumulative_update_3 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_4:*:*:*:*:*:* Versions 2019 cumulative_update_4 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_5:*:*:*:*:*:* Versions 2019 cumulative_update_5 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_6:*:*:*:*:*:* Versions 2019 cumulative_update_6 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_7:*:*:*:*:*:* Versions 2019 cumulative_update_7 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:* Versions 2019 cumulative_update_8 Vulnerable ·Microsoft
Remediation
Microsoft 2 updates
- Security Update
- Microsoft Exchange Server 2010 Service Pack 3 14.03.0513.000
- Security Update
- Microsoft Exchange Server 2013 Cumulative Update 21 15.00.1395.012
- Microsoft Exchange Server 2013 Cumulative Update 22 15.00.1473.006
- Microsoft Exchange Server 2013 Cumulative Update 23 15.00.1497.012
- Microsoft Exchange Server 2013 Service Pack 1 15.00.0847.064
- Microsoft Exchange Server 2016 Cumulative Update 10 15.01.1531.012
- Microsoft Exchange Server 2016 Cumulative Update 11 15.01.1591.018
- Microsoft Exchange Server 2016 Cumulative Update 12 15.01.1713.010
- Microsoft Exchange Server 2016 Cumulative Update 13 15.01.1779.008
- Microsoft Exchange Server 2016 Cumulative Update 14 15.01.1847.012
- Microsoft Exchange Server 2016 Cumulative Update 15 15.01.1913.012
- Microsoft Exchange Server 2016 Cumulative Update 16 15.01.1979.008
- Microsoft Exchange Server 2016 Cumulative Update 17 15.01.2044.013
- Microsoft Exchange Server 2016 Cumulative Update 18 15.01.2106.013
- Microsoft Exchange Server 2016 Cumulative Update 19 15.01.2176.009
- Microsoft Exchange Server 2016 Cumulative Update 8 15.01.1415.010
- Microsoft Exchange Server 2016 Cumulative Update 9 15.01.1466.016
- Microsoft Exchange Server 2019 15.02.0221.018
- Microsoft Exchange Server 2019 Cumulative Update 1 15.01.1979.006
- Microsoft Exchange Server 2019 Cumulative Update 2 15.02.0397.011
- Microsoft Exchange Server 2019 Cumulative Update 3 15.02.0464.015
- Microsoft Exchange Server 2019 Cumulative Update 4 15.02.0659.012
- Microsoft Exchange Server 2019 Cumulative Update 5 15.02.0595.008
- Microsoft Exchange Server 2019 Cumulative Update 6 15.02.0529.013
- Microsoft Exchange Server 2019 Cumulative Update 7 15.02.0721.013
- Microsoft Exchange Server 2019 Cumulative Update 8 15.02.0792.010
Vendor assessments
Microsoft
Microsoft's page for this CVE →
- Impact
- Remote Code Execution
- Exploited
- Yes
- Publicly disclosed
- No
- Exploitability
- Exploitation Detected
Timeline
- 2021-11-03 Added to CISA KEV
- 2026-10-02 Threatist record created from CVE-2021-26857
- 2026-10-03 Alias added: GHSA-2qwq-gqpm-q83g
References
More Microsoft Exchange Server vulnerabilities
- TI-2024-14170 Microsoft Exchange Server Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2022-19610 Microsoft Exchange Server Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2021-13547 Microsoft Exchange Server Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2021-13502 Microsoft Exchange Server Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2021-08465 Microsoft Exchange Server Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2023-07929 Microsoft Exchange Server Remote Code Execution Vulnerability KEVCVSS 3.1HIGH 8.8
Sources
- CVE-2021-26857 · CVE Program
- CVE-2021-26857 · NVD
- CISA Known Exploited Vulnerabilities
- FIRST EPSS
- GHSA-2qwq-gqpm-q83g · GitHub Advisory Database · CC BY 4.0
- CVE-2021-26857 · Microsoft Security Update Guide
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences