What is the CVSS score of CVE-2026-1143?

CVE-2026-1143 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of A3700r Firmware are affected by CVE-2026-1143?

Organizations using A weakness face significant risk from CVE-2026-1143, a buffer overflow vulnerability rated CVSS 8.8.

Is there a public PoC exploit available for CVE-2026-1143?

Yes, a public proof-of-concept exploit is available for CVE-2026-1143. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-1143?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

A3700r Firmware CVE-2026-1143

HIGH

Buffer Overflow (CWE-119)

2026-01-19 cna@vuldb.com

Buffer Overflow A3700r Firmware

8.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 29, 2026 - 18:31 vuln.today

Public exploit code

CVE Published

Jan 19, 2026 - 07:16 nvd

HIGH 8.8

DescriptionCVE.org

A weakness has been identified in TOTOLINK A3700R 9.1.2u.5822_B20200513. This affects the function setWiFiEasyGuestCfg of the file /cgi-bin/cstecgi.cgi. Executing a manipulation of the argument ssid can lead to buffer overflow. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks.

AnalysisAI

Buffer overflow in TOTOLIK A3700R firmware version 9.1.2u.5822_B20200513 allows authenticated remote attackers to achieve complete system compromise through manipulation of the ssid parameter in the WiFi guest configuration function. Public exploit code exists for this vulnerability and no patch is currently available. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Authenticate to TOTOLINK router

Delivery

Send crafted HTTP POST request to /cgi-bin/cstecgi.cgi

Exploit

Inject oversized ssid parameter into setWiFiEasyGuestCfg function

Execution

Overflow buffer memory

Impact

Execute arbitrary code

Access

Authenticate to TOTOLINK router

Delivery

Send crafted HTTP POST request to /cgi-bin/cstecgi.cgi

Exploit

Inject oversized ssid parameter into setWiFiEasyGuestCfg function

Execution

Overflow buffer memory

Impact

Execute arbitrary code

Vulnerability AssessmentAI

Exploitation	TOTOLIK A3700R firmware version 9.1.2u.5822_B20200513 with guest WiFi configuration feature enabled. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	CVSS 8.8 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	A remote attacker could exploit this vulnerability to buffer overflow.
Remediation	Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 7 days: Identify all affected systems and apply vendor patches promptly. …

Threat intelligence, references, and detailed analysis are available after sign-in.

CVE-2026-1143 vulnerability details – vuln.today

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A3700r Firmware CVE-2026-1143

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

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Attack ChainAIDerived

Vulnerability AssessmentAI

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External POC / Exploit Code