Cisco Secure Email Gateway and Cisco Secure Email and Web Manager Remote Command Execution Vulnerability
Priority CRITICAL 100Exploited in the wildCWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
A vulnerability in the Spam Quarantine feature of Cisco AsyncOS Software for Cisco Secure Email Gateway and Cisco Secure Email and Web Manager could allow an unauthenticated, remote attacker to execute arbitrary system commands on an affected device with root privileges. This vulnerability is due to insufficient validation of HTTP requests by the Spam Quarantine feature. An attacker could exploit this vulnerability by sending a crafted HTTP request to the affected device. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system with root privileges.
Why it matters now
Exploitation Active In CISA KEV since 2025-12-17CISA due date 2025-12-24
EPSS 0.32392 98th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Active
- Automatable
- Yes
- 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 |
|---|---|---|---|---|---|
| Cisco | Cisco Secure Email | 14.0.0-698; 13.5.1-277; 13.0.0-392; 14.2.0-620; 13.0.5-007; 13.5.4-038; 14.2.1-020; 14.3.0-032; 15.0.0-104; 15.0.1-030; 15.5.0-048; 15.5.1-055; 15.5.2-018; 16.0.0-050; 15.0.3-002; 16.0.0-054; 15.5.3-022; 16.0.1-017 | — | No fix listed | CNA |
| Cisco | Cisco Secure Email and Web Manager | 13.6.2-023; 13.6.2-078; 13.0.0-249; 13.0.0-277; 13.8.1-052; 13.8.1-068; 13.8.1-074; 14.0.0-404; 12.8.1-002; 14.1.0-227; 13.6.1-201; 14.2.0-203; 14.2.0-212; 12.8.1-021; 13.8.1-108; 14.2.0-224; 14.3.0-120; 15.0.0-334; 15.5.1-024; 15.5.1-029; 15.5.2-005; 16.0.0-195; 15.5.3-017; 16.0.1-010; 15.0.1-035; 16.0.2-088 | — | No fix listed | CNA |
- Cisco Secure Email VendorCisco Affected 14.0.0-698; 13.5.1-277; 13.0.0-392; 14.2.0-620; 13.0.5-007; 13.5.4-038; 14.2.1-020; 14.3.0-032; 15.0.0-104; 15.0.1-030; 15.5.0-048; 15.5.1-055; 15.5.2-018; 16.0.0-050; 15.0.3-002; 16.0.0-054; 15.5.3-022; 16.0.1-017 Fixed in — No fix listed CNA
- Cisco Secure Email and Web Manager VendorCisco Affected 13.6.2-023; 13.6.2-078; 13.0.0-249; 13.0.0-277; 13.8.1-052; 13.8.1-068; 13.8.1-074; 14.0.0-404; 12.8.1-002; 14.1.0-227; 13.6.1-201; 14.2.0-203; 14.2.0-212; 12.8.1-021; 13.8.1-108; 14.2.0-224; 14.3.0-120; 15.0.0-334; 15.5.1-024; 15.5.1-029; 15.5.2-005; 16.0.0-195; 15.5.3-017; 16.0.1-010; 15.0.1-035; 16.0.2-088 Fixed in — No fix listed CNA
CPE configurations NVD · 22
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:* | before 15.0.5-016; 15.5 to before 15.5.4-012; 16.0 to before 16.0.4-016 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:secure_email_gateway_virtual_appliance_c100v:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:a:cisco:secure_email_gateway_virtual_appliance_c300v:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:a:cisco:secure_email_gateway_virtual_appliance_c600v:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:secure_email_gateway_c195:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:secure_email_gateway_c395:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:secure_email_gateway_c695:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:* | before 15.0.2-007; 15.5 to before 15.5.4-007; 16.0 to before 16.0.4-010 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:secure_email_and_web_manager_virtual_appliance_m100v:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:a:cisco:secure_email_and_web_manager_virtual_appliance_m300v:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:* Versions before 15.0.5-016; 15.5 to before 15.5.4-012; 16.0 to before 16.0.4-016 Vulnerable ·Cisco
- cpe:2.3:a:cisco:secure_email_gateway_virtual_appliance_c100v:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:a:cisco:secure_email_gateway_virtual_appliance_c300v:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:a:cisco:secure_email_gateway_virtual_appliance_c600v:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:secure_email_gateway_c195:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:secure_email_gateway_c395:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:secure_email_gateway_c695:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:* Versions before 15.0.2-007; 15.5 to before 15.5.4-007; 16.0 to before 16.0.4-010 Vulnerable ·Cisco
- cpe:2.3:a:cisco:secure_email_and_web_manager_virtual_appliance_m100v:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:a:cisco:secure_email_and_web_manager_virtual_appliance_m300v:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Show 12 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cisco:secure_email_and_web_manager_virtual_appliance_m600v:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:secure_email_and_web_manager_m170:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:secure_email_and_web_manager_m190:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:secure_email_and_web_manager_m195:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:secure_email_and_web_manager_m380:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:secure_email_and_web_manager_m390:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:secure_email_and_web_manager_m390x:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:secure_email_and_web_manager_m395:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:secure_email_and_web_manager_m680:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:secure_email_and_web_manager_m690:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:secure_email_and_web_manager_m690x:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:secure_email_and_web_manager_m695:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:a:cisco:secure_email_and_web_manager_virtual_appliance_m600v:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:secure_email_and_web_manager_m170:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:secure_email_and_web_manager_m190:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:secure_email_and_web_manager_m195:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:secure_email_and_web_manager_m380:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:secure_email_and_web_manager_m390:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:secure_email_and_web_manager_m390x:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:secure_email_and_web_manager_m395:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:secure_email_and_web_manager_m680:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:secure_email_and_web_manager_m690:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:secure_email_and_web_manager_m690x:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:secure_email_and_web_manager_m695:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2025-12-17 Added to CISA KEV
- 2026-10-02 Threatist record created from CVE-2025-20393
- 2026-10-03 Alias added: GHSA-mrgj-cg36-fgq8
References
Advisory 1
More Cisco Asyncos vulnerabilities
- TI-2026-74174 Arbitrary file write in Cisco Secure Email Gateway via AMP feature KEVCVSS 3.1CRITICAL 9.8
- TI-2026-53489 Cisco Secure Email Gateway SQL Injection Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2021-13698 Cisco Web Security Appliance Proxy Service Denial of Service Vulnerability CVSS 3.1HIGH 8.6
- TI-2018-11020 Cisco Email Security Appliance URL Filtering Denial of Service Vulnerability CVSS 3.1HIGH 8.6
- TI-2019-01567 Cisco Email Security Appliance Denial of Service Vulnerability CVSS 3.1HIGH 8.6
- TI-2019-01508 Cisco Web Security Appliance HTTPS Certificate Denial of Service Vulnerability CVSS 3.1HIGH 8.6
Sources
- CVE-2025-20393 · CVE Program
- CVE-2025-20393 · NVD
- CISA Known Exploited Vulnerabilities
- FIRST EPSS
- GHSA-mrgj-cg36-fgq8 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences