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Fencer Vulns
critical 9.8

CVE-2026-76519 kev in the critical feed json

Cisco Secure Email Gateway Arbitrary File Write Vulnerability

published 2026-10-14 25 d ago modified 2026-10-15 24 d ago also EUVD-2026-101420

cvss
9.8
version 3.1, CNA
cisa kev
Exploited
added 2026-10-14
epss
6.2%
EPSS 6.2% chance of exploitation in 30 days, percentile 93%
public exploits
1
Metasploit

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.

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.

Patch / fix

cisa required action Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

  • cisco asyncos 15.5.5-014, 16.5.0-780

Timeline

  1. CISA SSVC: exploitation active
  2. First public exploit (Metasploit exploit/unix/smtp/cisco_secure_email_gateway_amp_file_write_rce)
  3. Added to CISA KEV
  4. Published
  5. CISA patch deadline

Known exploited

Added
26 d ago
Patch by
2026-10-17 (23 d ago)
Ransomware
Not known
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Vendor, product
Cisco, Secure Email Gateway
CISA name
Cisco Secure Email Gateway Relative Path Traversal Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
total
Assessed
26 d ago

Exploit prediction

6.23% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Cisco Cisco Secure Email

Classification

Weakness
  • CWE-23 Relative Path Traversal

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.