Medium severity · published Sep 24, 2025
CVE-2025-20339
Cisco SD-WAN vEdge Software Access Control List Bypass Vulnerability
5.8
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CS
Cisco SD-WAN vEdge Cloud · Cisco
20.9.1; 20.9.1.1; 20.9.2; 20.9.3; 20.9.3.1; 20.9.2.2; +6 more · source: vendor
CS
Cisco SD-WAN vEdge Router · Cisco
20.3.1; 20.3.2; 20.4.1; 20.4.1.1; 20.3.3; 20.4.1.2; +26 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-20339
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-20339
sec.cloudapps.cisco.com
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-defaultacl-pSJk9nVF
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