Improper input validation in Cisco Secure Web Appliance
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
A vulnerability in the scanning engines of Cisco AsyncOS Software for Cisco Secure Web Appliance, formerly known as Cisco Web Security Appliance (WSA), could allow an unauthenticated, remote attacker to bypass a configured rule, thereby allowing traffic onto a network that should have been blocked. This vulnerability exists because malformed, encoded traffic is not properly detected. An attacker could exploit this vulnerability by connecting through an affected device to a malicious server and receiving malformed HTTP responses. A successful exploit could allow the attacker to bypass an explicit block rule and receive traffic that should have been rejected by the device.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Cisco | Cisco Secure Web Appliance | 11.8.0-414; 11.8.1-023; 11.8.3-018; 11.8.3-021; 12.0.1-268; 12.0.3-007; 12.5.2-007; 12.5.1-011; 12.5.4-005; 12.5.5-004; 14.5.0-498; 14.0.3-014; 14.0.2-012 | — | No fix listed | CNA |
- Cisco Secure Web Appliance VendorCisco Affected 11.8.0-414; 11.8.1-023; 11.8.3-018; 11.8.3-021; 12.0.1-268; 12.0.3-007; 12.5.2-007; 12.5.1-011; 12.5.4-005; 12.5.5-004; 14.5.0-498; 14.0.3-014; 14.0.2-012 Fixed in — No fix listed CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:* | 11.8 to before 14.0.4 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asyncos:14.5.0:*:*:*:*:*:*:* | 14.5.0 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:s195:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:s395:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:s695:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:* Versions 11.8 to before 14.0.4 Vulnerable ·Cisco
- cpe:2.3:o:cisco:asyncos:14.5.0:*:*:*:*:*:*:* Versions 14.5.0 Vulnerable ·Cisco
- cpe:2.3:h:cisco:s195:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:s395:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:s695:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2022-20952
- 2026-10-03 Alias added: GHSA-36pr-655q-f5wg
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-2025-14683 Cisco Secure Email Gateway and Cisco Secure Email and Web Manager Remote Command Execution Vulnerability KEVCVSS 3.1CRITICAL 10.0
- 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
Sources
- CVE-2022-20952 · CVE Program
- CVE-2022-20952 · NVD
- FIRST EPSS
- GHSA-36pr-655q-f5wg · 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