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[NEW] [medium] Cisco Secure Email Gateway: Multiple vulnerabilities enable bypass of security measures

mediumCVE-2026-20354CVE-2026-20355
A remote, anonymous attacker can exploit multiple vulnerabilities in Cisco AsyncOS and Cisco Secure Email Gateway to bypass security measures.

CSIRTS triage

vendor: Ciscoproduct: Secure Email GatewayAuthentication bypass
What
Multiple vulnerabilities in Cisco Secure Email Gateway and AsyncOS allow remote anonymous attackers to bypass security measures.
Who is affected
Deployments of Cisco Secure Email Gateway handling email traffic.
Urgency
Medium severity; security bypass requires prompt patching to prevent unauthorized access.
Action
Apply patches for CVE-2026-20354 and CVE-2026-20355 to Cisco Secure Email Gateway.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity
medium
Published
2026-09-03
Exploitation
Not in CISA KEV at last sync
Language
Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-3156

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-20354coverage & exploitation statusNVD · CVE.org
CVE-2026-20355coverage & exploitation statusNVD · CVE.org

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