CVE-2025-20339

Cisco SD-WAN vEdge Software Access Control List Bypass Vulnerability

MEDIUM
5.8
CVSS Score
Published: September 24, 2025 at 04:40 PM UTC
Updated: September 26, 2026 at 12:27 AM UTC
2 products affected across 1 vendorSD-WAN vEdge RouterSD-WAN vEdge Cloud

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Severity
MEDIUM5.8
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.8MEDIUMcisco
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-284

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