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9.8

Cisco Secure Email may mismanage resources

CVE-2026-20353 · published 28 days ago
Summary

Cisco Secure Email and Cisco Secure Email and Web Manager contain coding mistakes that could let a user or attacker keep a system resource active longer than intended. This could lead to slowed performance or denial of service. Apply the latest software hardening updates from Cisco to fix the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
cisco cisco secure email 14.0.0-698
Original advisory text
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...
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.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker full control
Severity
9.8 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-664Improper Control of a Resource Through its Lifetime
Timeline
Published14 Sep 2026
Updated11 Oct 2026
First seen14 Sep 2026
Sources
CVE-2026-20353 · NVD
CVE-2026-20353 · MITRE
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