What is the CVSS score of CVE-2026-1686?

CVE-2026-1686 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: 0.2%.

Which versions of A3600r Firmware are affected by CVE-2026-1686?

Totolik A3600R wireless routers (version 5.9c.4959) contain a critical vulnerability that allows remote attackers to execute arbitrary code with high severity (CVSS 8.8).

Is there a public PoC exploit available for CVE-2026-1686?

Yes, a public proof-of-concept exploit is available for CVE-2026-1686. Prioritise patching immediately. EPSS: 0.2%.

How to fix or mitigate CVE-2026-1686?

Within 24 hours: Identify all Totolink A3600R 5.9c.4959 devices in your network inventory and assess their exposure (internet-facing, internal-only, or DMZ placement). Within 7 days: Implement compensating controls (network segmentation, WAF rules, feature disabling) and consider temporarily isolating non-critical affected devices. Within 30 days: Develop a device replacement or migration plan, coordinate with Totolik for patch availability, and evaluate alternative router solutions with active vendor support.

A3600r Firmware CVE-2026-1686

HIGH

Buffer Overflow (CWE-119)

2026-01-30 cna@vuldb.com

Buffer Overflow A3600r 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 - 22:00 vuln.today

PoC Detected

Feb 10, 2026 - 14:43 vuln.today

Public exploit code

CVE Published

Jan 30, 2026 - 16:16 nvd

HIGH 8.8

DescriptionCVE.org

A security flaw has been discovered in Totolink A3600R 5.9c.4959. This issue affects the function setAppEasyWizardConfig in the library /lib/cste_modules/app.so. Performing a manipulation of the argument apcliSsid results in buffer overflow. It is possible to initiate the attack remotely. The exploit has been released to the public and may be used for attacks.

AnalysisAI

Buffer overflow in Totolink A3600R firmware version 5.9c.4959 allows authenticated remote attackers to execute arbitrary code through the setAppEasyWizardConfig function via a malformed apcliSsid parameter. Public exploit code exists for this vulnerability and no patch is currently available. Affected devices are at high risk given the lack of mitigation options and active exploitation potential.

Technical ContextAI

Classified as CWE-119 (Buffer Overflow). Affects A3600R Firmware. A security flaw has been discovered in Totolink A3600R 5.9c.4959. This issue affects the function setAppEasyWizardConfig in the library /lib/cste_modules/app.so. Performing a manipulation of the argument apcliSsid results in buffer overflow. It is possible to initiate the attack remotely. The exploit has been released to the public and may 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.