What is CVE-2025-20209?

CVE-2025-20209 is a high-severity vulnerability in Cisco Ios Xr Software, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2025-03-12.

How severe is CVE-2025-20209?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Cisco Ios Xr Software

CVE-2025-20209

A vulnerability in the Internet Key Exchange version 2 (IKEv2) function of Cisco IOS XR Software could allow an unauthenticated, remote attacker to prevent an affected device from processing any control plane UDP packets.  This vul…

EPSS: 0.005 (39.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Cisco Ios Xr Software — versions 6.5.3, 6.6.1, 6.5.2
Cisco Ios_xr — versions 6.5.1, 6.5.2, 6.5.3
Cisco Ncs_1004
Cisco Ncs_1010
Cisco Ncs_1014
Cisco Ncs_540l

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

psirt@cisco.com (Vendor Advisory)
psirt@cisco.com (Not Applicable)

Frequently asked questions

What is CVE-2025-20209?: CVE-2025-20209 is a high-severity vulnerability in Cisco Ios Xr Software, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2025-03-12.
How severe is CVE-2025-20209?: High severity. CVSS v3 base score is 7.5 out of 10.