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.
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History
Thu, 03 Sep 2026 15:45:00 +0000
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Wed, 02 Sep 2026 16:30:00 +0000
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| 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. | |
| Title | Cisco Secure Email S/MIME Ciphertext Decryption Vulnerabilty | |
| Weaknesses | CWE-345 | |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: cisco
Published:
Updated: 2026-09-02T17:58:57.899Z
Reserved: 2025-10-08T11:59:15.414Z
Link: CVE-2026-20355
No data.
Status : Awaiting Analysis
Published: 2026-09-02T17:17:34.027
Modified: 2026-09-02T19:23:13.660
Link: CVE-2026-20355
No data.
OpenCVE Enrichment
Updated: 2026-09-03T15:30:05Z