Cloudanix VulnDB

CVE-2026-20355

Medium · 5.9

CVSS

5.9

EPSS

0.2%

Published

Sep 2, 2026

CISA due date

—

The record

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 packages

Ecosystem Package Introduced Fixed

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