What is CVE-2026-20084?

CVE-2026-20084 is a high-severity vulnerability in Cisco Ios Xe Software, classified under Uncontrolled Resource Consumption. CVSS score: 8.6/10. Published 2026-03-25.

How severe is CVE-2026-20084?

High severity. CVSS v3 base score is 8.6 out of 10.

Resource exhaustion in Cisco Ios Xe Software

CVE-2026-20084

A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition. This vulnerab…

Vulnerability class: DoS (Denial of Service)

EPSS: 0.002 (36.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

Affected products

Cisco Ios Xe Software — versions 16.6.1, 16.6.2, 16.6.3

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

cisco-sa-bootp-WuBhNBxA

Frequently asked questions

What is CVE-2026-20084?: CVE-2026-20084 is a high-severity vulnerability in Cisco Ios Xe Software, classified under Uncontrolled Resource Consumption. CVSS score: 8.6/10. Published 2026-03-25.
How severe is CVE-2026-20084?: High severity. CVSS v3 base score is 8.6 out of 10.