CVE-2025-20339
MediumCVSS 5.8Exploitation Probability (EPSS)
Low risk22th percentile - higher than 22% of all known CVEs
Summary
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.
Risk Assessment
An attacker could bypass ACLs and gain access to protected network resources, potentially leading to unauthorized network access. The risk affects all devices with vulnerable ACL configurations.
Recommendation
Update Cisco SD-WAN vEdge Software to a version containing the fix. Until then, verify and strengthen ACL rules and monitor traffic.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS