Critical severity · published Aug 5, 2026
CVE-2026-20310
Cisco SD-WAN Software Security Hardening Release - Improper Link Resolution Before File Access
9.1
CVSS
0.6%
EPSS
No
On KEV
Description
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Catalyst SD-WAN engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.
The vulnerabilities tracked by CVE-2026-20310 are related to improper link resolution before file access issues that are grouped under the Common Weakness Enumeration (CWE) CWE-59.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CC
Cisco Catalyst SD-WAN Controller · Cisco
20.6.4; 20.9.2; 20.3.6; 20.7.2; 20.7.1; 20.5.1; +34 more · source: vendor
CC
Cisco Catalyst SD-WAN Manager · Cisco
20.1.12; 19.2.1; 18.4.4; 18.4.5; 20.1.1.1; 20.1.1; +34 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-20310
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-20310
sec.cloudapps.cisco.com
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-sdwan-faLcR3K
www.cve.org
https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification
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