TOTOLINK CA300-PoE 6.2c.884 /cgi-bin/cstecgi.cgi setWiFiBasicConfig KeyStr buffer overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.4$0-$5k1.25+

Summaryinfo

A vulnerability described as very critical has been identified in TOTOLINK CA300-PoE 6.2c.884. Affected is the function setWiFiBasicConfig of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument KeyStr results in buffer overflow. This vulnerability is cataloged as CVE-2026-123961. The attack may be launched remotely. Furthermore, there is an exploit available.

Detailsinfo

A vulnerability was found in TOTOLINK CA300-PoE 6.2c.884. It has been classified as very critical. Affected is the function setWiFiBasicConfig of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument KeyStr with an unknown input leads to a buffer overflow vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability.

The advisory is shared for download at lavender-bicycle-a5a.notion.site. This vulnerability is traded as CVE-2026-123961. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details and a public exploit are known. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 11/06/2026).

The exploit is shared for download at lavender-bicycle-a5a.notion.site. 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: 9.4

VulDB Base Score: 9.9
VulDB Temp Score: 9.4
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: 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

11/06/2026 Advisory disclosed
11/06/2026 +0 days VulDB entry created
11/06/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: totolink.net

Advisory: lavender-bicycle-a5a.notion.site
Status: Confirmed

CNA: VulDB
CVE: CVE-2026-123961 (🔒)

GCVE (CVE): GCVE-0-2026-123961
GCVE (VulDB): GCVE-100-432024
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 11/06/2026 18:12
Changes: 11/06/2026 18:12 (55)
Complete: 🔍
Submitter: wxhwxhwxh_mie
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #1033753: TOTOLINK CA300-PoE CA300-PoE_Firmware V6.2c.884 Buffer Overflow (by wxhwxhwxh_mie)

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