CVE-2026-76519KEV · OVERDUECWE-23

Cisco Secure Email Gateway Relative Path Traversal Vulnerability

Critical · published October 14, 2026

Patch now

Confirmed exploited, and the score agrees

CVSS calls it critical at 9.8. It is confirmed in active exploitation. It sits in the 75.2th percentile for exploit probability.

7
days past CISA
deadline
CVSS v3.1
9.8
EPSS
2%
Percentile
75.2
In the wild
Confirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.01573 · 75.2th percentile
Weakness
CWE-23 · Relative Path Traversal
Published
2026-10-14T21:19Z
KEV added
2026-10-14 · due 2026-10-17
Affected products (2)
ProductVersionsFixed in
cisco/asyncos≥ 15.0, < 15.5.5-01415.5.5-014
cisco/asyncos≥ 16.0, < 16.5.0-78016.5.0-780
References (2)
EPSS history
Timeline
  • 16 OCT 03:32Z
    EPSS moved — → 2%
    epss
  • 14 OCT 16:07Z
    Cisco Secure Email Gateway Arbitrary File Write Vulnerability
    cvelistv5
  • 14 OCT 16:07Z
    Cisco Secure Email Gateway Arbitrary File Write Vulnerability
    cvelistv5