PatchTheCVECVE-2026-76519: Cisco Secure Email Gateway Relative Path Traversal Vulnerability
CVE-2026-76519 is a critical-severity flaw (CVSS 9.8) affecting asyncos, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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
Why this priority
- Critical severity
- Exploited in the wild (CISA KEV)
- Covered by 3 security sources
- CISA SSVC: automatable with total technical impact
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.6% (top 25%) |
| CISA exploited list | Yes, fix due 2026-10-17 |
| Weakness | CWE-23 |
| Published | 2026-10-14 |
| Last modified | 2026-10-15 |
Am I affected?
Timeline
- Exploited Added to the CISA Known Exploited Vulnerabilities list
- Published CVE record published
- Updated Record last modified
- Deadline CISA due date for US federal agencies to patch
Exact fixes by distribution
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
Advisories and coverage
Official advisories
- HKCERT: Cisco Secure Email Gateway Remote Code Execution Vulnerability 2026-10-15
- Canadian Cyber Centre: Cisco security advisory (AV26-1042) – Update 1 2026-10-14
- Cisco Security Advisories: Cisco Secure Email Gateway Arbitrary File Write Vulnerability 2026-10-14
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-76519?
asyncos: upgrade to 15.5.5-014, 16.5.0-780. Exact commands for each OS are on this page.
Is CVE-2026-76519 being exploited?
Yes. CVE-2026-76519 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.
What does CVE-2026-76519 affect?
CVE-2026-76519 affects asyncos. Severity is critical (CVSS 9.8). 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 impr
How urgent is CVE-2026-76519?
Priority 89/100. Critical severity; Exploited in the wild (CISA KEV); Covered by 3 security sources; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action
Related CVEs
- CVE-2026-76461 CRITICAL 9.8 EXPLOITED UPGRADE Cisco Secure Email Gateway SQL Injection Vulnerability