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.
Analysis
Analysis and contextual insights are available on OpenCVE Cloud.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| Cisco | Cisco Secure Email | unknown |
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No data available yet.
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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Wed, 02 Sep 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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-354 | |
| References |
| |
| Metrics |
cvssV3_1
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Subscriptions
No data.
MITRE
Status: PUBLISHED
Assigner: cisco
Published:
Updated: 2026-09-02T17:58:58.074Z
Reserved: 2025-10-08T11:59:15.414Z
Link: CVE-2026-20354
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-09-02T17:17:33.897
Modified: 2026-09-02T17:17:33.897
Link: CVE-2026-20354
Redhat
No data.
OpenCVE Enrichment
No data.
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CWE-354
Improper Validation of Integrity Check Value