Exploited. On CISA's list since 2022-03-31.
Sophos Firewall Authentication Bypass Vulnerability
CVE-2022-1040 · Sophos Firewall · Published 2022-03-25
How bad would it be?
9.8 out of 10
CVSS rates it critical: about as damaging as flaws get.
How likely is it to be used?
over 99%
Estimated chance of exploitation in the next 30 days, among the top 1% of all scored flaws (EPSS, 2026-10-29).
Is it already being used?
Yes
CISA has seen it exploited in real attacks. For US government agencies the fix is deadline passed 1653 days ago (2022-04-21).
What CISA says to do
Apply updates per vendor instructions.
An authentication bypass vulnerability in User Portal and Webadmin of Sophos Firewall allows for remote code execution.
What the flaw is
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.
From the NVD.
Fixes and advisories
Learn this
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Understand the kind of weakness behind this flaw. These resources teach the weakness, rather than reproduce this specific CVE. Follow the vendor's advice above to fix the affected product.
CWE-158 · CISA KEV. We have not selected a close learning match for this label.
CWE is a catalogue of weakness types. Labels come from the sources shown and can differ or change. Resource matches reviewed 16 October 2026.
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Exploited flaws from CISA's KEV catalogue. Chance of exploitation from EPSS by FIRST. Descriptions and scores from the NVD. This product uses the NVD API but is not endorsed or certified by the NVD.