How severe is CVE-2022-1040?

CVE-2022-1040 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2022-1040?

Affected package information for CVE-2022-1040 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2022-1040?

No fixed version has been published for CVE-2022-1040 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2022-1040 actively exploited in the wild?

Yes. There are 15 known exploit references for CVE-2022-1040, including 1 documented proof-of-concept exploit on Exploit-DB and 11 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2022-1040?

CVE-2022-1040 has an EPSS (Exploit Prediction Scoring System) score of 94.4%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2022-1040 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2022-1040 (Sophos Firewall Authentication Bypass Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2022-03-31. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-04-21. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

Which products and versions are affected by CVE-2022-1040?

CVE-2022-1040 affects sophos sfos. Check the affected-products list on this page against your deployed version to confirm exposure.

Is there exploit tooling available for CVE-2022-1040?

A Nuclei detection template exists for CVE-2022-1040, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2022-1040 published, and has it been updated?

CVE-2022-1040 was published on March 25, 2022 and was last updated on October 27, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2022-03-31 — agencies required to remediate by 2022-04-21

CVE-2022-1040

CRITICAL

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.

Published

Mar 25, 2022

Updated

Oct 27, 2025

Affected

0 pkgs

Patched

None yet

Exploits

15 known

EPSS Exploitation Probability

via FIRST.org ↗

94.4%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

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.

Affected Products

1 product · 1 configurations

sfossophos

≤ 18.5.3

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-51006webappshardware

Sophos XG115w Firewall 17.0.10 MR-10 - Authentication Bypass

by Aryan Chehreghani · Sep 2, 2022

Exploit-DB Source

Frequently Asked Questions

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.

O3 Security · Impact-Aware SCA

Is CVE-2022-1040 in your stack?

O3 detects CVE-2022-1040 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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