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

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 - 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. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Authenticate as low-privilege user

Exploit

Send crafted HTTP request with oversized apcliSsid parameter

Execution

Trigger buffer overflow in setAppEasyWizardConfig function

Impact

Execute arbitrary code with device privileges

Access

Authenticate as low-privilege user

Exploit

Send crafted HTTP request with oversized apcliSsid parameter

Execution

Trigger buffer overflow in setAppEasyWizardConfig function

Impact

Execute arbitrary code with device privileges

Vulnerability AssessmentAI

Exploitation	Totolik A3600R firmware version 5.9c.4959 with setAppEasyWizardConfig function in /lib/cste_modules/app.so exposed via web interface. … 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 flaw, buffer overflow.
Remediation	Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

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). …

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

CVE-2026-1686 vulnerability details – vuln.today

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A3600r Firmware CVE-2026-1686

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