What is CVE-2026-20310?

CVE-2026-20310 is a critical-severity vulnerability in Cisco Catalyst Sd-wan Controller, classified under Improper Link Resolution Before File Access. CVSS score: 9.1/10. Published 2026-08-05.

How severe is CVE-2026-20310?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Cisco Catalyst Sd-wan Controller

CVE-2026-20310

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 ad…

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

Affected products

Cisco Catalyst Sd-wan Controller — versions 20.6.4, 20.9.2, 20.3.6
Cisco Catalyst Sd-wan Manager — versions 20.1.12, 19.2.1, 18.4.4

Weakness classification (CWE)

CWE-59 — Improper Link Resolution Before File Access

References

psirt@cisco.com

Frequently asked questions

What is CVE-2026-20310?: CVE-2026-20310 is a critical-severity vulnerability in Cisco Catalyst Sd-wan Controller, classified under Improper Link Resolution Before File Access. CVSS score: 9.1/10. Published 2026-08-05.
How severe is CVE-2026-20310?: Critical severity. CVSS v3 base score is 9.1 out of 10.