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CVE-2026-76519

A vulnerability in the Advanced Malware Protection (AMP) feature of Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to write arbitrary files on the…

  • Severity: Critical
  • CVSS 9.8
  • EPSS 1.57%
  • On CISA KEV
  • Public exploit
  • P1 · Patch now

Why P1: on CISA KEV.

Description

A vulnerability in the Advanced Malware Protection (AMP) feature of Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to write arbitrary files on the underlying operating system. This vulnerability is due to improper handling of email attachments when the file reputation service is enabled. An attacker could exploit this vulnerability by sending an email that contains a crafted attachment through an affected device. A successful exploit could allow the attacker to write arbitrary files and execute commands with root privileges on the underlying operating system.

CISA Known Exploited Vulnerability

Added 2026-10-14, remediation due 2026-10-17. Ransomware use: Unknown. Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for…

Affected products

  • cisco asyncos >= 15.0, < 15.5.5-014
  • cisco asyncos >= 16.0, < 16.5.0-780
  • Cisco Secure Email Gateway Version details not specified by CISA
  • cisco secure email gateway c195 Version details not specified in source
  • cisco secure email gateway c395 Version details not specified in source
  • cisco secure email gateway c695 Version details not specified in source
  • cisco secure email gateway virtual appliance c100v Version details not specified in source
  • cisco secure email gateway virtual appliance c300v Version details not specified in source
  • cisco secure email gateway virtual appliance c600v Version details not specified in source

Weakness

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Published 2026-10-14 · updated 2026-10-15 · sources: NVD, GitHub Advisory Database, CISA KEV