TOTOLINK A3600R 5.9c.4959 /lib/cste_modules/app.so setAppEasyWizardConfig rootSsid buffer overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.5$0-$5k2.12-

Summaryinfo

A vulnerability was found in TOTOLINK A3600R 5.9c.4959. It has been rated as critical. This affects the function setAppEasyWizardConfig in the library /lib/cste_modules/app.so. This manipulation of the argument rootSsid causes buffer overflow. This vulnerability is tracked as CVE-2026-31027. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in TOTOLINK A3600R 5.9c.4959. It has been declared as critical. Affected by this vulnerability is the function setAppEasyWizardConfig in the library /lib/cste_modules/app.so. The manipulation of the argument rootSsid 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. The summary by CVE is:

TOTOlink A3600R v5.9c.4959 contains a buffer overflow vulnerability in the setAppEasyWizardConfig interface of /lib/cste_modules/app.so. The vulnerability occurs because the rootSsid parameter is not properly validated for length, allowing remote attackers to trigger a buffer overflow, potentially leading to arbitrary code execution or denial of service.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-31027 since 03/09/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/01/2026).

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-2026-17913). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.5

VulDB Base Score: 8.8
VulDB Temp Score: 8.5
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: 🔒
Status: Not defined
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

03/09/2026 CVE reserved
04/01/2026 +22 days Advisory disclosed
04/01/2026 +0 days VulDB entry created
04/01/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: totolink.net

Advisory: github.com
Status: Not defined

CVE: CVE-2026-31027 (🔒)
GCVE (CVE): GCVE-0-2026-31027
GCVE (VulDB): GCVE-100-354697
EUVD: 🔒

Entryinfo

Created: 04/01/2026 18:05
Updated: 04/01/2026 19:32
Changes: 04/01/2026 18:05 (55), 04/01/2026 19:32 (1)
Complete: 🔍
Cache ID: 216:975:103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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