CVE-2025-25427: A stored cross-site scripting (XSS) vulnerability in the upnp.htm page of the web Interface in TP-Link WR841N

Q: How do I fix CVE-2025-25427?

wr841n firmware: upgrade to newer than 241230. Exact commands for each OS are on this page.

Q: Is CVE-2025-25427 being exploited?

CVE-2025-25427 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-25427 affect?

CVE-2025-25427 affects wr841n firmware. Severity is medium (CVSS 5.4). 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 descr

Q: How urgent is CVE-2025-25427?

Priority 36/100. Public exploit reference

Routine

MEDIUM 5.4UPGRADE

CVE-2025-25427 is a medium-severity flaw (CVSS 5.4) affecting wr841n firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-04-18
Last modified	2026-06-17

Publisher (CNA): TPLink · Vendor: tp-link

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-04-18 01:15 UTCPublished CVE record published
2026-06-17 09:00 UTCUpdated Record last modified

tp-link wr841n firmware UPGRADE

Affected: <= 241230

Fixed in: newer than 241230

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-25427?

wr841n firmware: upgrade to newer than 241230. Exact commands for each OS are on this page.

Is CVE-2025-25427 being exploited?

CVE-2025-25427 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-25427 affect?

CVE-2025-25427 affects wr841n firmware. Severity is medium (CVSS 5.4). 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 descr

How urgent is CVE-2025-25427?

Priority 36/100. Public exploit reference

Software pages

TP-Link vulnerabilities

References

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