CVE-2025-20240
MEDIUMDescription
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 improper sanitization of user-supplied input. An attacker could exploit this vulnerability by persuading a user to click a malicious link. A successful exploit could allow the attacker to execute a reflected XSS attack and steal user cookies from the affected device.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 19% of all known CVEs.
References
Related Vulnerabilities
Other CWE-692 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2023-26047 | Medium | 6.5 | 0.5% | - | Fix |
| CVE-2024-30924 | Medium | 4.6 | 0.3% | - | - |
| CVE-2025-53904 | Unscored | - | 0.3% | - | - |
| CVE-2025-49590 | Medium | 6.1 | 0.3% | - | Fix |
| CVE-2026-71478 | Medium | 6.1 | 0.2% | - | - |
| CVE-2024-42214 | Medium | 5.3 | 0.2% | - | - |
Common questions
How do I fix CVE-2025-20240?
No published fix for CVE-2025-20240 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2025-20240 being actively exploited?
Not that we know of. CVE-2025-20240 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.27% is the estimated probability that it will be exploited in the next 30 days. That is higher than 19% of all scored CVEs.
How severe is CVE-2025-20240?
CVE-2025-20240 has a CVSS v3 base score of 6.1, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-09-26.