CVE-2026-9031

Authenticated service crash via unvalidated flash-write input

Published Aug 7, 2026 · Updated Aug 7, 2026

Improper input validation in TP-Link Archer A6 v4 before V4_1.15.10 Build 260625 Rel.25447 allows remote authenticated users to crash httpd. The HTTP-WRITEOEM handler passes insufficiently validated user-supplied data to internal flash-write handling logic. High-privilege authentication and an adjacent network position are required; exploitation crashes httpd or the device and removes web-interface access.

CVSS severity6.8
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in TP-Link Archer A6 v4 before V4_1.15.10 Build 260625 Rel.25447 allows remote authenticated users to crash httpd. The HTTP-WRITEOEM handler passes insufficiently validated user-supplied data to internal flash-write handling logic. High-privilege authentication and an adjacent network position are required; exploitation crashes httpd or the device and removes web-interface access.

The record

CVE
CVE-2026-9031
Published
Aug 7, 2026
Updated
Aug 7, 2026
Vendor
TP-Link Systems Inc.
Product
Archer A6
Classifications
CWE-20, CAPEC-153, T1499.004
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 7, 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 <V4_1.15.10 Build 260625 Rel.25447

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

TP-Link Systems Inc. · Archer A6version=0 <V4_1.15.10 Build 260625 Rel.25447

Published CVSS scores

6.8TP-Link Systems Inc.CVSS:4.0/AV:A/AC:L/AT:N/PR:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CAPEC-153Input Data Manipulation
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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