CVE-2026-20353 Cisco Secure Email Gateway Security Hardening Release
Cisco Secure Email Gateway received security hardening updates to address internal resource management issues identified during a security review.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20353?
CVE-2026-20353 is a critical vulnerability in Cisco Secure Email, published on 14 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Email Gateway and Cisco Secure Email and Web Manager engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20353 are related to issues with improper control of a resource through its lifetime that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-664.
Weakness: CWE-664
Which versions are affected by CVE-2026-20353?
How do I fix CVE-2026-20353?
No fix has been published for CVE-2026-20353 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-20353 being exploited?
There is no known exploitation of CVE-2026-20353 in the wild and no public exploit code.
Sources
Also known as GHSA-2xw5-xcxg-33qg.