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CVE-2026-20310 is a critical vulnerability in Cisco Catalyst SD-WAN software affecting Cisco Catalyst SD-WAN Controller and Cisco Catalyst SD-WAN Manager. The flaw is classified as CWE-59, improper link resolution before file access, indicating that the software does not safely resolve links before performing file operations. This class of weakness can permit a symlink or similar link-manipulation attack that causes the application to access unintended files or resources. Cisco states the issue was identified during an internal security review and addressed through security hardening releases. The vulnerability is remotely exploitable and has been assigned a CVSS v3.1 score of 9.1 with vector AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H, indicating low attack complexity, no user interaction, changed scope, and high impact to confidentiality, integrity, and availability once exploited.
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No public exploit code observed for this vulnerability.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical Catalyst SD-WAN vulnerability described as improper link resolution before file access.
A critical Cisco Catalyst SD-WAN Software vulnerability involving improper link resolution before file access, potentially enabling symbolic link abuse to access unintended files.
A link following vulnerability in Cisco Catalyst SD-WAN Software.
A critical improper link resolution before file access vulnerability in Cisco Catalyst SD-WAN software/security hardening releases, associated with CWE-59 and remotely exploitable.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.