What is the CVSS score of CVE-2026-26731?

CVE-2026-26731 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 A3002ru Firmware are affected by CVE-2026-26731?

A high-severity buffer overflow vulnerability (CVE-2026-26731) affecting TOTOLIK A3002RU routers allows remote attackers to execute arbitrary code with a CVSS score of 8.8.

Is there a public PoC exploit available for CVE-2026-26731?

Yes, a public proof-of-concept exploit is available for CVE-2026-26731. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-26731?

Within 24 hours: Identify and inventory all TOTOLINK A3002RU V2.1.1-B20211108.1455 devices in the network and isolate affected units from critical systems. Within 7 days: Implement network segmentation to restrict router management access, disable remote administration features if enabled, and deploy WAF rules to block malicious formDnsv6 requests. Within 30 days: Replace affected routers with patched or alternative vendor models, or prepare emergency patching procedures once vendor patches become available.

A3002ru Firmware CVE-2026-26731

HIGH

Out-of-bounds Write (CWE-787)

2026-02-17 cve@mitre.org

Buffer Overflow Memory Corruption A3002ru 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

PoC Detected

Mar 16, 2026 - 16:16 vuln.today

Public exploit code

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

CVE Published

Feb 17, 2026 - 19:21 nvd

HIGH 8.8

DescriptionCVE.org

TOTOLINK A3002RU V2.1.1-B20211108.1455 was discovered to contain a stack-based buffer overflow via the routernamer`parameter in the formDnsv6 function.

AnalysisAI

Remote code execution in TOTOLIK A3002RU V2.1.1 firmware results from a stack-based buffer overflow in the DNS configuration function that can be exploited by authenticated network users. Public exploit code exists for this vulnerability, and attackers with valid credentials can achieve full system compromise including code execution and data manipulation. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Authenticate to router management interface

Exploit

Send malicious formDnsv6 request with oversized routernamer parameter

Execution

Trigger stack buffer overflow in formDnsv6 function

Impact

Execute arbitrary code with router privileges

Access

Authenticate to router management interface

Exploit

Send malicious formDnsv6 request with oversized routernamer parameter

Execution

Trigger stack buffer overflow in formDnsv6 function

Impact

Execute arbitrary code with router privileges

Vulnerability AssessmentAI

Exploitation	TOTOLINK A3002RU V2.1.1-B20211108.1455 with formDnsv6 function accessible. … 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	An attacker could exploit this vulnerability to compromise the affected system.
Remediation	Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Identify and inventory all TOTOLINK A3002RU V2.1.1-B20211108.1455 devices in the network and isolate affected units from critical systems. …

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

CVE-2026-26731 vulnerability details – vuln.today

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A3002ru Firmware CVE-2026-26731

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

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Attack ChainAIDerived

Vulnerability AssessmentAI

Recommended ActionAI

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External POC / Exploit Code