CVE-2026-17252

Unauthenticated web service crash via stack overwrite

Published Aug 21, 2026 · Updated Aug 21, 2026

Stack-based out-of-bounds write in TP-Link TL-MR6400 v7 before 1.9.0 Build 260714 allows remote attackers to crash the web service. The login request handler writes beyond a stack buffer while parsing a specially crafted malformed HTTP request. Exploitation requires unauthenticated access from an adjacent network and temporarily removes access to the router's web management interface until the service recovers.

CVSS severity7.1
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based out-of-bounds write in TP-Link TL-MR6400 v7 before 1.9.0 Build 260714 allows remote attackers to crash the web service. The login request handler writes beyond a stack buffer while parsing a specially crafted malformed HTTP request. Exploitation requires unauthenticated access from an adjacent network and temporarily removes access to the router's web management interface until the service recovers.

The record

CVE
CVE-2026-17252
Published
Aug 21, 2026
Updated
Aug 21, 2026
Vendor
TP-Link Systems Inc.
Product
TL-MR6400
Classifications
CWE-787, CAPEC-100, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.9.0 Build 260714

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

TP-Link Systems Inc. · TL-MR6400version=0 <1.9.0 Build 260714

Published CVSS scores

7.1TP-Link Systems Inc.CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CAPEC-100Overflow Buffers
T1499.004Application or System Exploitation

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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