PT-2026-21381 · Tenda · Tenda Ac21

Hhsw34 · Published 2026-02-21 · Updated 2026-02-22 · CVE-2026-2872

Positive Technologies (AI Summary)

CVSS v2.0

9.0

High

Base vector

AV:N/AC:L/Au:S/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Tenda A21 version 1.0.0.0

Description A security issue exists in the Tenda A21 router. The issue is a stack-based buffer overflow in the MAC Filtering Configuration Endpoint, specifically within the set device name function located in the /goform/setBlackRule file. Manipulation of the devName/mac argument can trigger the overflow. This can be exploited remotely. The exploit has been publicly disclosed.

Recommendations Update to a newer version that contains a fix for this vulnerability.

Exploit

Fix

Stack Overflow

Buffer Overflow

Weakness Enumeration

CWE-121

CWE-119

Related Identifiers

CVE-2026-2872

Affected Products

Tenda Ac21

References · 13

• 🔥 https://github.com/QIU-DIE/cve-nneeww/issues/3 · Exploit
• https://osv.dev/vulnerability/CVE-2026-2872 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-2872 · Security Note
• https://twitter.com/VulmonFeeds/status/2025247200809291831 · Twitter Post
• https://vuldb.com/?submit.754634 · Note
• https://twitter.com/CveFindCom/status/2025241811833303477 · Twitter Post
• https://vuldb.com/?id.347109 · Note
• https://twitter.com/CveTodo/status/2025246685673234441 · Twitter Post
• https://t.me/CVEtracker/45386 · Telegram Post
• https://t.me/cveNotify/152727 · Telegram Post
• https://tenda.com.cn · Note
• https://vuldb.com/?ctiid.347109 · Note
• https://twitter.com/CVEnew/status/2025425463506862561 · Twitter Post