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 TOTOLINK

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

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. An attacker with network access and valid credentials can execute arbitrary code with full system privileges.

Technical ContextAI

Classified as CWE-119 (Buffer Overflow). Affects A3700R Firmware. 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.

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.