What is CVE-2026-20004?

CVE-2026-20004 is a high-severity vulnerability in Cisco Ios Xe Software, classified under CWE-771. CVSS score: 7.4/10. Published 2026-03-25.

How severe is CVE-2026-20004?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in Cisco Ios Xe Software

CVE-2026-20004

A vulnerability in the TLS library of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to exhaust the available memory of an affected device. This vulnerability is due to improper management of memory resources du…

EPSS: 0.001 (22.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

Affected products

Cisco Ios Xe Software — versions 16.9.1, 16.9.2, 16.9.1a

Weakness classification (CWE)

CWE-771

References

cisco-sa-iosxe-tls-dos-TVgLDEZL

Frequently asked questions

What is CVE-2026-20004?: CVE-2026-20004 is a high-severity vulnerability in Cisco Ios Xe Software, classified under CWE-771. CVSS score: 7.4/10. Published 2026-03-25.
How severe is CVE-2026-20004?: High severity. CVSS v3 base score is 7.4 out of 10.