Which versions of Wr841N Firmware are affected by CVE-2025-25427?

Organizations using the upnp.htm page of the web Interface in TP-Link WR841N face significant risk from CVE-2025-25427, a cross-site scripting vulnerability rated CVSS 8.6.

Is there a public PoC exploit available for CVE-2025-25427?

Yes, a public proof-of-concept exploit is available for CVE-2025-25427. Prioritise patching immediately. EPSS: 0.4%.

How to fix or mitigate CVE-2025-25427?

Within 7 days: Identify all affected systems running the upnp.htm page of the web Interface in TP-Link WR841N and apply vendor patches promptly. Verify anti-CSRF tokens and content security policies are enforced.

Wr841N Firmware CVE-2025-25427

Q: What is the CVSS score of CVE-2025-25427?

CVE-2025-25427 has a CVSS 4.0 base score of 8.6 (High). CVSS vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:L/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.4%.

HIGH

Cross-site Scripting (XSS) (CWE-79)

2025-04-18 f23511db-6c3e-4e32-a477-6aa17d310630

TP-Link XSS Wr841N Firmware

8.6

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

8.6 HIGH

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:L/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:L/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

Scope

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:37 vuln.today

PoC Detected

Jul 09, 2025 - 17:35 vuln.today

Public exploit code

CVE Published

Apr 18, 2025 - 01:15 nvd

HIGH 8.6

DescriptionCVE.org

A stored cross-site scripting (XSS) vulnerability in the upnp.htm page of the web Interface in TP-Link WR841N v14/v14.6/v14.8 <= Build 241230 Rel. 50788n allows remote attackers to inject arbitrary JavaScript code via the port mapping description. This leads to an execution of the JavaScript payload when the upnp page is loaded.

AnalysisAI

A stored cross-site scripting (XSS) vulnerability in the upnp.htm page of the web Interface in TP-Link WR841N v14/v14.6/v14.8 <= Build 241230 Rel. Rated high severity (CVSS 8.6), this vulnerability is no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. A stored cross-site scripting (XSS) vulnerability in the upnp.htm page of the web Interface in TP-Link WR841N v14/v14.6/v14.8 <= Build 241230 Rel. 50788n allows remote attackers to inject arbitrary JavaScript code via the port mapping description. This leads to an execution of the JavaScript payload when the upnp page is loaded. Affected products include: Tp-Link Wr841N Firmware.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.

CVE-2025-25427 vulnerability details – vuln.today

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