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CVE-2026-76519

CRITICAL 9.8 KNOWN EXPLOITED

Published 2026-10-14 · Last modified 2026-10-15

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.

ACTIVELY EXPLOITED

Confirmed exploited in the wild — in CISA KEV since 2026-10-14. Patch or mitigate now.

Exploitation likelihood

1.6%chance of exploitation in 30 days · 75th percentile

● In CISA KEV (2026-10-14) ○ Public exploit / PoC

Impact if exploited

9.8CVSS 3.1 · CRITICAL

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

Test against your own equipment

curl -s https://vulnpedia.com/cve/CVE-2026-76519/poc.jsonMachine-readable PoC index for this CVE (for automation).

Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-76519/poc.json

Affected

Vendors Cisco

Products Cisco Secure Email Asyncos Secure Email Gateway Virtual Appliance C100v Secure Email Gateway Virtual Appliance C300v Secure Email Gateway Virtual Appliance C600v Secure Email Gateway C195 Secure Email Gateway C395 Secure Email Gateway C695

Weakness (CWE)

  • CWE-23: Relative Path Traversal

CVSS vector

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

Known Affected Software Configurations

VendorProductVersion range
CiscoAsyncos≥ 15.0 and < 15.5.5-014
CiscoAsyncos≥ 16.0 and < 16.5.0-780

All CVSS metrics

  • CRITICAL 9.8 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CRITICAL 9.8 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Advisories

Sources: NVD · CVE.org · EPSS