Details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 14 September 2026
- Updated
- 15 October 2026
- Weakness
- CWE-664
CVE-2026-20353 CVE-2026-20353
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.
CVSS base score
9.8
/10
Critical- CISA KEV
- Not listed
- Public exploit
- None known
- EPSS
- 0.40% chance of exploitation in 30 days