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%.

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

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

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 Assessment

Weakness	CWE CWE-119 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Totolik A3600R firmware version 5.9c.4959 with setAppEasyWizardConfig function in /lib/cste_modules/app.so exposed via web interface. Low-privilege user account required for authentication.
Impact	CVSS 8.8 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: None. Exploitable via remote/network. Public exploit/POC available.
Exploit ScenarioDerived	A remote attacker could exploit this flaw, buffer overflow.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

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.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:00 CVSS 8.8

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. [CVSS 8.8 HIGH]

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.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

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.

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Exploit and PoC references, threat intelligence from 22 sources

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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

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.

Executive ViewAI

Why It Matters

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). Organizations using this device model face immediate risk of network compromise, data exfiltration, and lateral movement into corporate infrastructure, particularly if these devices are deployed as edge network equipment or in remote office locations.

Business Impact: High

Compensating Controls

Network segmentation: Isolate affected routers on dedicated VLAN with restricted ingress/egress rules. 2) Disable unnecessary remote management and web administration interfaces. 3) Implement strict firewall rules limiting traffic to/from setAppEasyWizardConfig endpoints. 4) Deploy WAF rules to block malicious payloads targeting /lib/cste_modules/app.so. 5) Enable detailed logging and monitoring for exploitation attempts. 6) Consider replacing devices with patched firmware versions once available from vendor, or evaluate alternative router platforms with active security support.

Threat Intelligence Overview

EPSS Score

0.2%

Top 62% exploitable

Exploit

POC

Public exploit code exists

Data Quality

5 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC Yes

EPSS 0.2%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +44

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.