CVE-2023-1671 — Sophos Web Appliance Command Injection Vulnerability

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.

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
Sophos	Sophos Web Appliance	unspecified

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2023-11-16. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-04-04T00:00:00.000Z
• Last modified: 2025-10-21T23:15:21.081Z
• Added to CISA KEV: 2023-11-16
• BOD 22-01 due: 2023-12-07

09References

• www.sophos.com — https://www.sophos.com/en-us/security-advisories/sophos-sa-20230404-swa-rce
• packetstormsecurity.com — http://packetstormsecurity.com/files/172016/Sophos-Web-Appliance-4.3.10.4-Comman…