CVE-2022-1040 — Sophos Firewall Authentication Bypass Vulnerability

An authentication bypass vulnerability in the User Portal and Webadmin allows a remote attacker to execute code in Sophos Firewall version v18.5 MR3 and older.

01What is this vulnerability?

An authentication bypass vulnerability in the User Portal and Webadmin allows a remote attacker to execute code in Sophos Firewall version v18.5 MR3 and older.

02Affected products

Vendor	Product	Versions
Sophos	Sophos Firewall	unspecified

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2022-03-31. 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: 2022-03-25T12:10:10.000Z
• Last modified: 2025-10-21T23:15:43.601Z
• Added to CISA KEV: 2022-03-31
• BOD 22-01 due: 2022-04-21

09References

• www.sophos.com — https://www.sophos.com/en-us/security-advisories/sophos-sa-20220325-sfos-rce
• packetstormsecurity.com — http://packetstormsecurity.com/files/168046/Sophos-XG115w-Firewall-17.0.10-MR-10…
• www.exploit-db.com — https://www.exploit-db.com/exploits/51006