CVE-2025-25900: A buffer overflow vulnerability was discovered in TP-Link TL-WR841ND V11 via the username and password paramet

Routine

MEDIUM 4.9MITIGATE

CVE-2025-25900 is a medium-severity flaw (CVSS 4.9) affecting tl-wr841nd v11 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A buffer overflow vulnerability was discovered in TP-Link TL-WR841ND V11 via the username and password parameters at /userRpm/PPPoEv6CfgRpm.htm. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted packet.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-120
Published	2025-02-13
Last modified	2026-06-17

Publisher (CNA): MITRE · 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

2025-02-13 16:16 UTCPublished CVE record published
2026-06-17 09:01 UTCUpdated Record last modified

tp-link tl-wr841nd v11 firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

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-2025-25900?

tl-wr841nd v11 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-25900 being exploited?

CVE-2025-25900 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-2025-25900 affect?

CVE-2025-25900 affects tl-wr841nd v11 firmware. Severity is medium (CVSS 4.9). A buffer overflow vulnerability was discovered in TP-Link TL-WR841ND V11 via the username and password parameters at /userRpm/PPPoEv6CfgRpm.htm. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted packet.

How urgent is CVE-2025-25900?

Priority 26/100. No elevated risk signals yet.

Software pages

TP-Link vulnerabilities

Related CVEs

CVE-2025-25899 LOW 3.5 MITIGATE A buffer overflow vulnerability was discovered in TP-Link TL-WR841ND V11 via the 'gw' parameter at /userRpm/Wa

References

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