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Permalink CVE-2026-20353
9.8 CRITICAL
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Network (N)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): None (N)
  • User Interaction (UI): None (N)
  • Scope (S): Unchanged (U)
  • Confidentiality (C): High (H)
  • Integrity (I): High (H)
  • Availability (A): High (H)
  • Modified Attack Vector (MAV): Network (N)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): None (N)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): High (H)
  • Modified Scope (MS): Unchanged (U)
  • Modified Integrity (MI): High (H)
  • Modified Availability (MA): High (H)
created 1 week, 2 days ago Activity log
  • Created & dismissed (no matching packages found) suggestion 1 week, 2 days ago
Cisco Secure Email Gateway Security Hardening Release

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.

Affected products

Cisco Secure Email
  • ==15.5.3-022
  • ==16.0.1-017
  • ==14.0.0-698
  • ==14.2.0-620
  • ==13.5.4-038
  • ==15.5.4-012
  • ==16.0.2-112
  • ==15.0.0-104
  • ==16.0.3-044
  • ==16.0.4-016
  • ==13.0.5-007
  • ==14.2.1-020
  • ==14.3.0-032
  • ==15.5.0-048
  • ==15.5.2-018
  • ==15.0.3-002
  • ==15.5.1-055
  • ==16.0.0-050
  • ==13.5.1-277
  • ==16.0.0-054
  • ==15.0.5-016
  • ==15.0.1-030
  • ==13.0.0-392