Vulnerability record · CVE-2026-2871 · published 21 February 2026

CVE-2026-2871: Tenda a21 firmware memory buffer overflow vulnerability

Tenda · A21 Firmware

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

7.4 CVSS 4.0 High EPSS 1.0% · top 37.7% CWE-119 · Memory buffer overflowCWE-121 · Stack-based buffer overflow

7.4CVSS 4.0 base score, v2 9.0

1.0%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

6References, 1 tagged exploit

17 Jun 2026Last modified by NVD

Description

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

A21 Firmware Tenda

References

Link	Tags
https://github.com/QIU-DIE/cve-nneeww/issues/2	ExploitIssue TrackingMitigationThird Party Advisory
https://vuldb.com/?ctiid.347108	Permissions RequiredVDB Entry
https://vuldb.com/?id.347108	Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.754630	Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.754631	Third Party AdvisoryVDB Entry
https://www.tenda.com.cn/	Product

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-2871), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.