TOTOLINK A3700R 9.1.2u.5822_B20200513 /cgi-bin/cstecgi.cgi setWiFiEasyGuestCfg ssid buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in TOTOLINK A3700R 9.1.2u.5822_B20200513. This impacts the function setWiFiEasyGuestCfg of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument ssid leads to buffer overflow. This vulnerability is referenced as CVE-2026-1143. Remote exploitation of the attack is possible. Furthermore, an exploit is available.

Detailsinfo

A vulnerability was found in TOTOLINK A3700R 9.1.2u.5822_B20200513 and classified as critical. This issue affects the function setWiFiEasyGuestCfg of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument ssid with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability.

It is possible to read the advisory at lavender-bicycle-a5a.notion.site. The identification of this vulnerability is CVE-2026-1143. The exploitation is known to be easy. The attack may be initiated remotely. Technical details as well as a public exploit are known.

The exploit is available 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.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.8
VulDB Temp Score: 8.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.8
CNA Vector: 🔒

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: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

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

01/18/2026 Advisory disclosed
01/18/2026 +0 days VulDB entry created
01/19/2026 +1 days VulDB entry last update

Sourcesinfo

Vendor: totolink.net

Advisory: lavender-bicycle-a5a.notion.site
Status: Not defined

CVE: CVE-2026-1143 (🔒)
GCVE (CVE): GCVE-0-2026-1143
GCVE (VulDB): GCVE-100-341735
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 01/18/2026 08:44
Updated: 01/19/2026 09:17
Changes: 01/18/2026 08:44 (56), 01/19/2026 09:17 (31)
Complete: 🔍
Submitter: wxhwxhwxh_mie
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #735502: TOTOLINK A3700R V9.1.2u.5822_B20200513 Buffer Overflow (by wxhwxhwxh_mie)

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