CVE-2023-1671
KEVSophos Web Appliance Command Injection Vulnerability
Description
Sophos Web Appliance contains a command injection vulnerability in the warn-proceed handler that allows for remote code execution.
A pre-auth command injection vulnerability in the warn-proceed handler of Sophos Web Appliance older than version 4.3.10.4 allows execution of arbitrary code.
CVSS 3.1 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HPublishedApr 4, 2023
Last modifiedJun 17, 2026
Added to KEVNov 16, 2023
Remediation dueDec 7, 2023
References
- packetstormsecurity.com/files/172016/Sophos-Web-Appliance-4.3.10.4-Command-Injection.htmlExploitThird Party Advisory
- sophos.com/en-us/security-advisories/sophos-sa-20230404-swa-rceVendor Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-1671US Government Resource
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89
Risk assessment · Critical
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1055 days
- CVSS
- 9.8 CRITICAL
- EPSS (30-day exploit probability)
- 100.0% · top 1% of all CVEs
- Weakness
- CWE-77
- Attack vector
- Network, remotely reachable
- Preconditions
- No privileges and no user interaction
Recommended actions
- 1.Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.