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 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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.006 (48.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
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)
References
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.