CVE-2026-76519

critical

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.

https://www.securityweek.com/cisco-warns-of-exploited-secure-email-gateway-vulnerability/

https://www.helpnetsecurity.com/2026/10/15/cve-2026-0322-cve-2026-76519-cve-2026-105133-cve-2026-105134-exploted/

https://thehackernews.com/2026/10/palo-alto-networks-patches-pan-os.html

https://thehackernews.com/2026/10/cisco-warns-of-active-attacks.html

https://securityaffairs.com/200985/security/cisco-urges-customers-to-patch-email-gateway-flaw-and-check-for-compromise.html

https://www.theregister.com/security/2026/10/14/cisco-make-me-root-email-bug-exploited-as-a-0-day-by-unknown-crims/5303168

https://www.cisa.gov/news-events/alerts/2026/10/14/cisa-adds-four-known-exploited-vulnerabilities-catalog

https://www.bleepingcomputer.com/news/security/cisco-patches-actively-exploited-secure-email-gateway-zero-day/

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-afw-zqYJkjxp

https://github.com/Mickysalivan/CVE-2026-76519-Proof-of-concept

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76519

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-101420

Details

Source: Mitre, NVD

Published: 2026-10-14

Updated: 2026-10-15

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

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

Severity: Critical

EPSS

EPSS: 0.01743

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest

Detections

Analytics