CVE record · CVE-2026-20354

Cisco Secure Email S/MIME Ciphertext Decryption Vulnerabilty

CVSS 5.9 MediumEPSS 0.0020 · 10th percentile

Published by the CVE Program (CNA: cisco) at 2 Sept 2026, 16:14 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Cisco	Cisco Secure Email	affected 14.0.0-698 affected 13.5.1-277 affected 13.0.0-392 affected 14.2.0-620 affected 13.0.5-007 affected 13.5.4-038 affected 14.2.1-020 affected 14.3.0-032 affected 15.0.0-104 affected 15.0.1-030 affected 15.5.0-048 affected 15.5.1-055 and 12 more Other versions: unknown

Identifiers: CVE-2026-20354
CNA: cisco
Weakness (CWE): CWE-354
Tags: Cisco Secure Email
CWE-354
Published: 2 Sept 2026
Updated: 2 Sept 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
5.9	Medium	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N	CNA (cisco)

CISA KEV Not listed.
EPSS 0.0020, the 10th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 2 Sept 2026. New records show when each source confirmed them.

Sources

References from the CNA

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-smime-disc-dzw4rEdY

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.