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CVE-2026-76519: Cisco Secure Email Gateway Relative Path Traversal Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-10-14
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-14 · updated 2026-10-15
• Weakness: CWE-23

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.

Affected products

• Cisco Asyncos: from 15.0 before 15.5.5-014; from 16.0 before 16.5.0-780 — fixed in 15.5.5-014, 16.5.0-780

How to fix

Upgrade to a fixed version: Cisco Asyncos 15.5.5-014, 16.5.0-780. Check the vendor advisory for mitigations.

In the news

• 2026-017: Critical Vulnerability in Cisco Secure Email Gateway
• Cisco Secure Email Gateway Arbitrary File Write Vulnerability

References

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-afw-zqYJkjxp
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76519

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