CVE-2020-15069
Sophos XG Firewall Buffer Overflow Vulnerability
What the flaw is
Sophos XG Firewall contains a buffer overflow vulnerability that allows for remote code execution via the "HTTP/S bookmark" feature.
Description as published by CISA. We have not independently reproduced it.
What CISA requires
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
This deadline is binding on US federal civilian agencies under BOD 22-01. It is not a legal deadline for anyone else, but it is a useful urgency signal — CISA sets it by how actively the flaw is being used, not by CVSS.
Public exploit code
3 public repositories referencing this CVE have been catalogued on GitHub. Treat this as a strong signal to prioritise patching, not as a verified working exploit — many such repositories are scanners, write-ups or forks rather than functional code.
Vendor advisories
Primary sources
Was this page helpful?
If something here is wrong or out of date, tell us and we will check the source.
Thanks — that is recorded.
Other Sophos entries
See allSource: CISA KEV catalog · last verified August 6, 2026. Rebuilt automatically twice a day.