Improper access control in Cisco SD-WAN vEdge Routers - CVE-2025-20339
Published: September 24, 2025
Vulnerability identifier: #VU116085
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:U/U:Green
CVE-ID: CVE-2025-20339
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Cisco Systems, Inc
Affected software:
Cisco SD-WAN vEdge Routers
Cisco SD-WAN vEdge Routers
Detailed vulnerability description
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper enforcement of the "implicit deny all" at the end of a configured ACL when processing IPv4 packets. A remote attacker can bypass implemented security restrictions and send unauthorized traffic to a device interface.
How to mitigate CVE-2025-20339
Install updates from vendor's website.