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5.9 Medium

CVE-2026-20355 Multiple vulnerabilities in the Secure/Multipurpose Internet Mail Extensions (S/MIME) decryption functionality of…

Description

Multiple vulnerabilities in the Secure/Multipurpose Internet Mail Extensions (S/MIME) decryption functionality of Cisco Secure Email could allow an unauthenticated, remote attacker to recover plain text from encrypted email messages. These vulnerabilities are due to insufficient validation of message integrity. An attacker could exploit these vulnerabilities by using a machine-in-the-middle technique to intercept and modify traffic between email gateways. A successful exploit could allow the attacker to obtain plaintext content from the encrypted communication.

Affected products and versions

Product Affected versions Fixed in
Cisco Secure Email 16.5.0-780 No fix stated
Cisco Secure Email 16.0 16.0.0-050 → 16.0.4-016 No fix stated
Cisco Secure Email 15.5 15.5.0-048 → 15.5.4-012 No fix stated
Cisco Secure Email 15.0 15.0.0-104 → 15.0.5-016 No fix stated
Cisco Secure Email 14.3.0-032 No fix stated
Cisco Secure Email 14.2 14.2.0-620 → 14.2.1-020 No fix stated
Cisco Secure Email 14.0.0-698 No fix stated
Cisco Secure Email 13.5 13.5.1-277 → 13.5.4-038 No fix stated
Cisco Secure Email 13.0 13.0.0-392 → 13.0.5-007 No fix stated

References

Timeline

  1. Published
  2. Last modified

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