---
id: CVE-2026-76519
title: "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.\r\n\r\nThis vulnerability is due to i…"
summary: "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.\r\n\r\nThis vulnerability is due to i…"
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-23
vendor: cisco
product: asyncos
affected:
  - 'asyncos >= 15.0, < 15.5.5-014'
  - 'asyncos >= 16.0, < 16.5.0-780'
patched:
  - asyncos 16.5.0-780
published: '2026-10-14'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T13:47:19.470'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-76519'
references:
  - url: >-
      https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-afw-zqYJkjxp
    label: psirt@cisco.com
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76519
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - kev
  - in-the-wild
  - exploit-available
  - cve.org
kev: true
kevDateAdded: '2026-10-14'
kevDueDate: '2026-10-17'
kevRansomware: false
exploited: true
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/Mickysalivan/CVE-2026-76519-Proof-of-concept'
  checkedAt: '2026-10-27T19:12:36.385Z'
exploitAvailable: true
zeroDay: true
ssvc:
  exploitation: active
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-14T19:32:49.377572Z'
ingestedAt: '2026-10-14T17:44:53.677Z'
epss: 0.02152
epssPercentile: 0.82051
---

## Overview

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&nbsp;root privileges on the underlying operating system.

## Affected

- `asyncos >= 15.0, < 15.5.5-014`
- `asyncos >= 16.0, < 16.5.0-780`

## Remediation

Upgrade past the affected range:

- `asyncos 16.5.0-780`