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5.8

Cisco SD-WAN vEdge Software: Unauthorized Traffic Bypass via ACL Flaw

CVE-2025-20339 · published 1 year ago
Summary

An attacker can bypass security rules on Cisco SD-WAN devices without being authenticated. This could allow them to send unauthorized traffic to the device, potentially compromising network security. Update your SD-WAN software to fix the issue.

Original advisory text
A vulnerability in the access control list (ACL) processing of IPv4 packets of Cisco SD-WAN vEdge Software could allow an unauthenticated, remote attacker to bypass a configured ACL. This vulner...
A vulnerability in the access control list (ACL) processing of IPv4 packets of Cisco SD-WAN vEdge Software could allow an unauthenticated, remote attacker to bypass a configured ACL.

This vulnerability is due to the improper enforcement of the implicit deny all at the end of a configured ACL. An attacker could exploit this vulnerability by attempting to send unauthorized traffic to an interface on an affected device. A successful exploit could allow the attacker to bypass an ACL on the affected device.
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker partial control
Severity
5.8 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-284Improper Access Control
Timeline
Published24 Sep 2025
Updated31 Oct 2026
First seen7 Mar 2026
Sources
CVE-2025-20339 · NVD
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