VDB
CVE-2026-20353
CVE-2026-20353
PUBLISHED
CVSS 9.8 CRITICAL
Reported by cisco · Published September 14, 2026
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.
Risk Scores
CVSS 3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Cisco Secure Email | 14.0.0-698, 13.5.1-277, 13.0.0-392 |
| Cisco | Cisco Secure Email | 14.0.0-698, 13.5.1-277, 13.0.0-392 |
Timeline
- Sep 14, 2026 Coalition ESS Score
- Sep 14, 2026 CVE Published
- Sep 15, 2026 EPSS Score
- Sep 16, 2026 EPSS Score
- Sep 18, 2026 EPSS Score