What is CVE-2026-20210?

CVE-2026-20210 is a medium-severity vulnerability in Cisco Catalyst Sd-wan Manager, classified under CWE-779. CVSS score: 5.4/10. Published 2026-05-14.

How severe is CVE-2026-20210?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Cisco Catalyst Sd-wan Manager

CVE-2026-20210

A vulnerability in the web UI of Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an authenticated, remote attacker with read-only permissions to modify configurations and perform unauthorized actions on an affected syst…

EPSS: 0.000 (9.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

Affected products

Cisco Catalyst Sd-wan Manager — versions 20.1.12, 19.2.1, 18.4.4

Weakness classification (CWE)

CWE-779

References

psirt@cisco.com
psirt@cisco.com

Frequently asked questions

What is CVE-2026-20210?: CVE-2026-20210 is a medium-severity vulnerability in Cisco Catalyst Sd-wan Manager, classified under CWE-779. CVSS score: 5.4/10. Published 2026-05-14.
How severe is CVE-2026-20210?: Medium severity. CVSS v3 base score is 5.4 out of 10.