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. No patch is currently available.

Technical ContextAI

Classified as CWE-787 (Out-of-bounds Write). Affects the formDnsv6 component of A3002Ru Firmware. TOTOLINK A3002RU V2.1.1-B20211108.1455 was discovered to contain a stack-based buffer overflow via the routernamer`parameter in the formDnsv6 function.

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.