CVE-2025-20240
A vulnerability in the Web Authentication feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to conduct a…
- Published
- Updated
- Reserved
- Assigned by
- cisco
Description
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.
Timeline
ID reserved
By cisco
- 12 months later
· 12 months later
Published
- 2 days later
· 2 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | Medium6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVDNVD · Deferred | 3.1 | Medium6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.35% · top 71% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.1.
Weakness
Affected products
- affected 16.6.1
- affected 16.6.2
- affected 16.6.3
- affected 16.6.4
- affected 16.6.5
- affected 16.6.4a
- affected 16.6.5a
- affected 16.6.6
- affected 16.6.7
- affected 16.6.8
- affected 16.6.9
- affected 16.6.10
- affected 16.7.1
- affected 16.7.1a
- affected 16.7.1b
- affected 16.7.2
- affected 16.7.3
- affected 16.7.4
- affected 16.8.1
- affected 16.8.1a
- affected 16.8.1b
- affected 16.8.1s
- affected 16.8.1c
- affected 16.8.1d
- affected 16.8.2
- affected 16.8.1e
- affected 16.8.3
- affected 16.9.1
- affected 16.9.2
- affected 16.9.1a
- affected 16.9.1b
- affected 16.9.1s
- affected 16.9.3
- affected 16.9.4
- affected 16.9.3a
- affected 16.9.5
- affected 16.9.5f
- affected 16.9.6
- affected 16.9.7
- affected 16.9.8
- and 176 more
What to do
Exploitation: The Cisco Product Security Incident Response Team (PSIRT) is aware that proof-of-concept exploit code is available for the vulnerability described in this advisory. The Cisco PSIRT is not aware of any malicious use of the vulnerability that is described in this advisory.
References (1)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2025-20240)Record last updated .