What is the CVSS score of CVE-2026-2877?

CVE-2026-2877 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 A18 Firmware are affected by CVE-2026-2877?

A critical buffer overflow vulnerability affects Tenda A18 wireless router models running firmware 15.13.07.13, allowing unauthenticated remote attackers to execute arbitrary code and potentially…

How to fix or mitigate CVE-2026-2877?

Within 24 hours: Inventory all Tenda A18 devices running firmware 15.13.07.13 and isolate affected units from production networks if possible. Within 7 days: Implement network segmentation to restrict administrative access to these devices and enable WAF rules blocking malformed requests to /goform/WifiExtraSet endpoint. Within 30 days: Contact Tenda for firmware availability; if no patch emerges, evaluate replacement with patched router models and decommission vulnerable units from security-critical network segments.

A18 Firmware CVE-2026-2877

HIGH

Buffer Overflow (CWE-119)

2026-02-21 cna@vuldb.com

Buffer Overflow Stack Overflow A18 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 - 22:04 vuln.today

CVE Published

Feb 21, 2026 - 19:15 nvd

HIGH 8.8

DescriptionCVE.org

A vulnerability has been found in Tenda A18 15.13.07.13. This affects the function strcpy of the file /goform/WifiExtraSet of the component Httpd Service. The manipulation of the argument wpapsk_crypto5g leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.

AnalysisAI

Stack-based buffer overflow in Tenda A18 firmware versions up to 15.13.07.13 allows remote attackers with low privileges to achieve code execution through the wpapsk_crypto5g parameter in the /goform/WifiExtraSet endpoint. Public exploit code exists for this vulnerability, and no patch is currently available. The high CVSS score (8.8) reflects the combination of remote exploitability and complete system compromise potential.

Technical ContextAI

Classified as CWE-119 (Buffer Overflow). Affects A18 Firmware. A vulnerability has been found in Tenda A18 15.13.07.13. This affects the function strcpy of the file /goform/WifiExtraSet of the component Httpd Service. The manipulation of the argument wpapsk_crypto5g leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.

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.