TOTOLINK CP450 4.1.0 /cgi-bin/cstecgi.cgi topicurl buffer overflow

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 (≈)
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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.
9.0$0-$5k2.94

Summaryinfo

A vulnerability labeled as very critical has been found in TOTOLINK CP450 4.1.0. This affects an unknown function of the file /cgi-bin/cstecgi.cgi. Executing a manipulation of the argument topicurl can lead to buffer overflow. This vulnerability is handled as CVE-2026-85031. The attack can be executed remotely. Additionally, an exploit exists.

Detailsinfo

A vulnerability classified as very critical was found in TOTOLINK CP450 4.1.0. This vulnerability affects an unknown part of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument topicurl with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability.

This vulnerability was named CVE-2026-85031. The exploitation appears to be easy. The attack can be initiated remotely. Technical details and also a private exploit are known. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/02/2026).

It is declared as proof-of-concept.

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

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

Productinfo

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.0

VulDB Base Score: 9.9
VulDB Temp Score: 9.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Private
Status: Proof-of-Concept
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

09/02/2026 Advisory disclosed
09/02/2026 +0 days VulDB entry created
09/02/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: totolink.net

Status: Not defined

CVE: CVE-2026-85031 (🔒)
GCVE (CVE): GCVE-0-2026-85031
GCVE (VulDB): GCVE-100-398296
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 09/02/2026 22:20
Changes: 09/02/2026 22:20 (52)
Complete: 🔍
Submitter: summadeus
Cache ID: 216::103

Submitinfo

Accepted

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