What is CVE-2025-20240?

CVE-2025-20240 is a medium-severity vulnerability in Cisco Ios Xe Software, classified under CWE-692. CVSS score: 6.1/10. Published 2025-09-24.

How severe is CVE-2025-20240?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2025-20240 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Cisco Ios Xe Software

CVE-2025-20240

A vulnerability in the Web Authentication feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to conduct a reflected cross-site scripting attack (XSS) on an affected device. This vulnerability is due to impr…

EPSS: 0.003 (18.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Cisco Ios Xe Software — versions 16.6.1, 16.6.2, 16.6.3

Weakness classification (CWE)

CWE-692

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

psirt@cisco.com

Frequently asked questions

What is CVE-2025-20240?: CVE-2025-20240 is a medium-severity vulnerability in Cisco Ios Xe Software, classified under CWE-692. CVSS score: 6.1/10. Published 2025-09-24.
How severe is CVE-2025-20240?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2025-20240 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.