What is the CVSS score of CVE-2026-2886?

CVE-2026-2886 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 A21 Firmware are affected by CVE-2026-2886?

CVE-2026-2886 is a high-severity vulnerability affecting Tenda A21 wireless routers that could allow attackers to compromise device configuration and potentially gain unauthorized network access.

Is there a public PoC exploit available for CVE-2026-2886?

Yes, a public proof-of-concept exploit is available for CVE-2026-2886. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-2886?

Within 24 hours: Inventory all Tenda A21 1.0.0.0 devices in your network and isolate affected units from critical systems. Within 7 days: Implement network segmentation to restrict administrative access to these devices and monitor for suspicious configuration changes. Within 30 days: Develop a replacement plan for affected devices, contact Tenda for patch availability, or migrate to alternative networking equipment with active vendor support.

A21 Firmware CVE-2026-2886

HIGH

Buffer Overflow (CWE-119)

2026-02-21 cna@vuldb.com

Buffer Overflow Stack Overflow A21 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

PoC Detected

Feb 23, 2026 - 21:00 vuln.today

Public exploit code

CVE Published

Feb 21, 2026 - 21:16 nvd

HIGH 8.8

DescriptionCVE.org

A weakness has been identified in Tenda A21 1.0.0.0. This affects the function set_device_name of the file /goform/SetOnlineDevName. This manipulation of the argument devName causes stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks.

AnalysisAI

Stack Overflow and Tenda A21 1.0.0.0 are vulnerable to remote code execution through a stack-based buffer overflow in the device name configuration function, exploitable by authenticated attackers without user interaction. Public exploit code exists for this vulnerability, enabling attackers to achieve complete compromise of affected systems. No patch is currently available.

Technical ContextAI

Classified as CWE-119 (Buffer Overflow). Affects A21 Firmware. A weakness has been identified in Tenda A21 1.0.0.0. This affects the function set_device_name of the file /goform/SetOnlineDevName. This manipulation of the argument devName causes stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks.

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.