CVE-2025-20339 Cisco SD-WAN vEdge Software Access Control List Bypass Vulnerability
Unauthenticated remote attackers can bypass configured access control lists on Cisco SD-WAN vEdge devices by exploiting improper implicit deny enforcement.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-20339?
CVE-2025-20339 is a medium-severity vulnerability in Cisco SD-WAN vEdge Cloud, published on 24 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-284
Which versions are affected by CVE-2025-20339?
How do I fix CVE-2025-20339?
No fix has been published for CVE-2025-20339 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-20339 being exploited?
There is no known exploitation of CVE-2025-20339 in the wild and no public exploit code.
Sources
Also known as GHSA-97xx-3c9q-f5rx.