VDB-387112 · CVE-2026-9031 · EUVD-2026-54656

TP-Link Archer A6 v4 HTTP-WRITEOEM handler input validation

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.4	$0-$5k	2.79

Summaryinfo

A vulnerability described as problematic has been identified in TP-Link Archer A6 v4. Affected by this vulnerability is an unknown functionality of the component HTTP-WRITEOEM handler. Executing a manipulation can lead to input validation. This vulnerability is tracked as CVE-2026-9031. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in TP-Link Archer A6 v4 (unknown version) and classified as problematic. This vulnerability affects an unknown code block of the component HTTP-WRITEOEM handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect integrity, and availability. CVE summarizes:

An input validation vulnerability exists in the HTTP-WRITEOEM handler due to insufficient validation of user-supplied data before it is processed by internal flash-write handling logic. Successful exploitation may cause httpd process or device to crash, resulting in loss of access to the web interface and a denial-of-service condition.

The advisory is shared for download at tp-link.com. This vulnerability was named CVE-2026-9031 since 05/19/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/07/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-54656). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

TP-Link

Name

Archer A6 v4

License

commercial

Website

Vendor: https://www.tp-link.com/

CPE 2.3info

🔒

CPE 2.2info

🔒

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.4
VulDB Temp Score: 5.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

05/19/2026 CVE reserved
08/07/2026 +80 days Advisory disclosed
08/07/2026 +0 days VulDB entry created
08/07/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: tp-link.com

Advisory: tp-link.com
Status: Not defined

CVE: CVE-2026-9031 (🔒)
GCVE (CVE): GCVE-0-2026-9031
GCVE (VulDB): GCVE-100-387112
EUVD: 🔒

Entryinfo

Created: 08/07/2026 23:03
Updated: 08/07/2026 23:56
Changes: 08/07/2026 23:03 (51), 08/07/2026 23:56 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.