CVE-2025-25901Network attack vector

Service interruption via unbounded DNS parameter write

Published Feb 13, 2025 · Updated Feb 20, 2025

Buffer overflow in TP-Link TL-WR841ND V11 firmware allows remote attackers to cause a service interrupt via a crafted network request. The WAN SLAAC handler at /userRpm/WanSlaacCfgRpm.htm writes oversized dnsserver1 or dnsserver2 parameter data beyond a buffer. No authentication or user interaction is required, and the documented consequence is availability loss rather than data disclosure or modification.

CVSS severity7.5
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in TP-Link TL-WR841ND V11 firmware allows remote attackers to cause a service interrupt via a crafted network request. The WAN SLAAC handler at /userRpm/WanSlaacCfgRpm.htm writes oversized dnsserver1 or dnsserver2 parameter data beyond a buffer. No authentication or user interaction is required, and the documented consequence is availability loss rather than data disclosure or modification.

The record

CVE
CVE-2025-25901
Published
Feb 13, 2025
Updated
Feb 20, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 13, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 20, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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