Critical severity9.8NVD Advisory· Published Sep 14, 2026· Updated Sep 15, 2026
CVE-2026-20353
CVE-2026-20353
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2Patches
Vulnerability mechanics
References
2News mentions
2- Cisco Warns of Active Attacks Exploiting New Critical Secure Email Gateway VulnerabilityThe Hacker News · Oct 14, 2026
- Cisco Warns of New Zero-Day ISE Auth Bypass (CVSS 10.0) Exploited in Active AttacksThe Hacker News · Sep 17, 2026