Internet Explorer Memory Corruption Vulnerability
Priority CRITICAL 95Exploited in the wildCWE-416Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- Low · High · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Microsoft. Impact type from Microsoft.
Summary
Internet Explorer Memory Corruption Vulnerability
Why it matters now
Exploitation Active In CISA KEV since 2021-11-03CISA due date 2021-11-17Known ransomware use
EPSS 0.81667 99th percentileScored 2026-11-07
Fix Fixed Microsoft: 11 updates
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Active
- Automatable
- No
- Technical impact
- Partial
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 | Internet Explorer 11 | 1.0.0 to before 10.0.17134.2087 | 10.0.17134.2087 | Patch available | CNA |
| Microsoft | Internet Explorer 9 | 1.0.0 to before 6.0.6003.21070 | 6.0.6003.21070 | Patch available | CNA |
| Microsoft | Microsoft Edge (EdgeHTML-based) | 1.0..0 to before 10.0.17134.2087 | 10.0.17134.2087 | Patch available | CNA |
- Internet Explorer 11 VendorMicrosoft Affected 1.0.0 to before 10.0.17134.2087 Fixed in 10.0.17134.2087 Patch available CNA
- Internet Explorer 9 VendorMicrosoft Affected 1.0.0 to before 6.0.6003.21070 Fixed in 6.0.6003.21070 Patch available CNA
- Microsoft Edge (EdgeHTML-based) VendorMicrosoft Affected 1.0..0 to before 10.0.17134.2087 Fixed in 10.0.17134.2087 Patch available CNA
CPE configurations NVD · 21
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:microsoft:edge:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10_1507:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:arm64:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:x64:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_10_2004:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_10_20h2:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
- cpe:2.3:a:microsoft:edge:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10_1507:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:arm64:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:x64:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_10_2004:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_10_20h2:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
Show 11 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:a:microsoft:internet_explorer:11:-:*:*:*:*:*:* | 11 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:* | r2 sp1 | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* | r2 | Running on | Microsoft |
| cpe:2.3:a:microsoft:internet_explorer:9:*:*:*:*:*:*:* | 9 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
- cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:a:microsoft:internet_explorer:11:-:*:*:*:*:*:* Versions 11 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:* Versions r2 sp1 Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* Versions r2 Running on ·Microsoft
- cpe:2.3:a:microsoft:internet_explorer:9:*:*:*:*:*:*:* Versions 9 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
Remediation
Microsoft 11 updates
- Monthly Rollup
- Internet Explorer 11 6.3.9600.19968
- Windows 8.1 for 32-bit systems 6.3.9600.19968
- Windows 8.1 for x64-based systems 6.3.9600.19968
- Windows RT 8.1 6.3.9600.19968
- Windows Server 2012 R2 6.3.9600.19968
- Windows Server 2012 R2 (Server Core installation) 6.3.9600.19968
- Monthly Rollup
- Internet Explorer 11 6.2.9200.23298
- Windows Server 2012 6.2.9200.23298
- Windows Server 2012 (Server Core installation) 6.2.9200.23298
- Monthly Rollup
- Internet Explorer 9 6.0.6003.21070
- Windows Server 2008 for 32-bit Systems Service Pack 2 6.0.6003.21070
- Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 6.0.6003.21070
- Windows Server 2008 for x64-based Systems Service Pack 2 6.0.6003.21070
- Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 6.0.6003.21070
Show 8 more Microsoft updates
- Monthly Rollup
- Internet Explorer 11 6.1.7601.24566
- Windows 7 for 32-bit Systems Service Pack 1 6.1.7601.24566
- Windows 7 for x64-based Systems Service Pack 1 6.1.7601.24566
- Windows Server 2008 R2 for x64-based Systems Service Pack 1 6.1.7601.24566
- Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 6.1.7601.24566
- Security Update
- Internet Explorer 11 10.0.17763.1817
- Microsoft Edge (EdgeHTML-based) 10.0.17763.1817
- Windows 10 Version 1809 for 32-bit Systems 10.0.17763.1817
- Windows 10 Version 1809 for ARM64-based Systems 10.0.17763.1817
- Windows 10 Version 1809 for x64-based Systems 10.0.17763.1817
- Windows Server 2019 10.0.17763.1817
- Windows Server 2019 (Server Core installation) 10.0.17763.1817
- Security Update
- Internet Explorer 11 10.0.17134.2087
- Microsoft Edge (EdgeHTML-based) 10.0.17134.2087
- Windows 10 Version 1803 for 32-bit Systems 10.0.17134.2087
- Windows 10 Version 1803 for ARM64-based Systems 10.0.17134.2087
- Windows 10 Version 1803 for x64-based Systems 10.0.17134.2087
- Security Update
- Internet Explorer 11 10.0.18363.1440
- Microsoft Edge (EdgeHTML-based) 10.0.18363.1440
- Windows 10 Version 1909 for 32-bit Systems 10.0.18363.1440
- Windows 10 Version 1909 for ARM64-based Systems 10.0.18363.1440
- Windows 10 Version 1909 for x64-based Systems 10.0.18363.1440
- Windows Server, version 1909 (Server Core installation) 10.0.18363.1440
- Security Update
- Internet Explorer 11 10.0.10240.18874
- Microsoft Edge (EdgeHTML-based) 10.0.10240.18874
- Windows 10 for 32-bit Systems 10.0.10240.18874
- Windows 10 for x64-based Systems 10.0.10240.18874
- Security Update
- Internet Explorer 11 10.0.14393.4283
- Microsoft Edge (EdgeHTML-based) 10.0.14393.4283
- Windows 10 Version 1607 for 32-bit Systems 10.0.14393.4283
- Windows 10 Version 1607 for x64-based Systems 10.0.14393.4283
- Windows Server 2016 10.0.14393.4283
- Windows Server 2016 (Server Core installation) 10.0.14393.4283
- Security Update
- Internet Explorer 11 10.0.19043.867
- Microsoft Edge (EdgeHTML-based) 10.0.19043.867
- Windows 10 Version 2004 for 32-bit Systems 10.0.19043.867
- Windows 10 Version 2004 for ARM64-based Systems 10.0.19043.867
- Windows 10 Version 2004 for x64-based Systems 10.0.19043.867
- Windows 10 Version 20H2 for 32-bit Systems 10.0.19043.867
- Windows 10 Version 20H2 for ARM64-based Systems 10.0.19043.867
- Windows Server, version 2004 (Server Core installation) 10.0.19043.867
- Windows Server, version 20H2 (Server Core Installation) 10.0.19043.867
- https
- Internet Explorer 11 IE Cumulative
- Internet Explorer 9 IE Cumulative
Vendor assessments
Microsoft
Microsoft's page for this CVE →
- Impact
- Remote Code Execution
- Exploited
- Yes
- Publicly disclosed
- Yes
- Exploitability
- Exploitation Detected
Timeline
- 2021-11-03 Added to CISA KEV
- 2026-10-02 Threatist record created from CVE-2021-26411
- 2026-10-03 Alias added: GHSA-c5rh-mmr6-c7ch
References
More Microsoft Edge vulnerabilities
- TI-2024-07390 Type confusion in Google Chrome KEVCVSS 3.1CRITICAL 9.6
- TI-2022-03781 Out-of-bounds write in Google Chrome KEVCVSS 3.1CRITICAL 9.6
- TI-2015-00277 Use-after-free vulnerability in Adobe Flash Player before 13.0.0.269 and 14.x through… KEVCVSS 3.1CRITICAL 9.8
- TI-2015-00275 Unspecified vulnerability in Adobe Flash Player through 13.0.0.262 and 14.x, 15.x, and… KEVCVSS 3.1CRITICAL 9.8
- TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
- TI-2020-12621 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
Sources
- CVE-2021-26411 · CVE Program
- CVE-2021-26411 · NVD
- CISA Known Exploited Vulnerabilities
- FIRST EPSS
- GHSA-c5rh-mmr6-c7ch · GitHub Advisory Database · CC BY 4.0
- CVE-2021-26411 · Microsoft Security Update Guide
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences