TOTOLINK N600R 4.3.0cu.7647_B20210106 CGI /cgi-bin/cstecgi.cgi setSystemConfig Hostname stack-based overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.1$0-$5k2.51

Summaryinfo

A vulnerability identified as very critical has been detected in TOTOLINK N600R 4.3.0cu.7647_B20210106. The impacted element is the function setSystemConfig of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Performing a manipulation of the argument Hostname results in stack-based overflow. This vulnerability is identified as CVE-2026-79911. The attack can be initiated remotely. Additionally, an exploit exists.

Detailsinfo

A vulnerability was found in TOTOLINK N600R 4.3.0cu.7647_B20210106. It has been classified as very critical. This affects the function setSystemConfig of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument hostname with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on confidentiality, integrity, and availability.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-79911. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details and a public exploit are known. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/25/2026).

The exploit is shared for download at github.com. 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.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.1

VulDB Base Score: 10.0
VulDB Temp Score: 9.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
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

08/25/2026 Advisory disclosed
08/25/2026 +0 days VulDB entry created
08/25/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: totolink.net

Advisory: github.com
Status: Not defined

CVE: CVE-2026-79911 (🔒)
GCVE (CVE): GCVE-0-2026-79911
GCVE (VulDB): GCVE-100-395061
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 08/25/2026 17:02
Changes: 08/25/2026 17:02 (57)
Complete: 🔍
Submitter: ST4R0002
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #881258: Totolink N600R Wireless N Router V4.3.0cu.7647_B20210106 Stack-based Buffer Overflow (by ST4R0002)

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