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2026-017: Critical Vulnerability in Cisco Secure Email Gateway

On 14 October 2026, Cisco published a security advisory addressing a critical vulnerability affecting the Advanced Malware Protection (AMP) feature of Cisco Secure Email Gateway. This vulnerability could allow an unauthenticated, remote attacker to write arbitrary files and execute commands with root privileges on the underlying operating system.<br> The Cisco PSIRT is aware of active exploitation of this vulnerability.<br> CERT-EU strongly recommends updating the Content Scanner Tools package or upgrading Cisco AsyncOS Software to a fixed release as soon as possible, prioritising appliances reachable from the internet. CERT-EU also recommends checking all affected appliances for indicators of compromise.<br>
CRITICAL
Severity & confidence
Source severitycritical
Platform severitycritical
Confidencehigh
Exploitationunknown
CVSS-
Affected
CountriesEU
Reporting sources (1)
CERT-EU - Security Advisories
Open source โ†—
Timeline & provenance
Published2026-10-15T09:40:14
Last updated2026-10-21T05:52:00
Ingested2026-10-15T09:40:14
FreshnessNEAR-REAL-TIME
Threat typemalware
Recommended action
No recommended action published with this item - review the original source.
Next steps
  1. Identify affected systems in your environment.
  2. Apply the vendor patch or mitigation guidance.
  3. Review logs for indicators described in the advisory.
  4. Follow the affected vendor/product to track updates.
Confidence explanation
Reported by a government or cert-grade source (CISA, NCSC, NVD, ENISA, MSRC).
Source type: gov ยท Original: CERT-EU - Security Advisories