PT-2026-21395 · Tenda · Tenda Ac21

Hhsw34 · Published 2026-02-21 · Updated 2026-02-22 · CVE-2026-2886

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 flaw exists in Tenda A21 version 1.0.0.0 related to the set device name function within the /goform/SetOnlineDevName file. Manipulation of the devName argument can trigger a stack-based buffer overflow, allowing for remote exploitation. The exploit has been publicly released.

Recommendations Update to a newer version that contains a fix for this vulnerability. As a temporary workaround, consider restricting access to the /goform/SetOnlineDevName file to minimize the risk of exploitation.

Exploit

Fix

Buffer Overflow

Stack Overflow

Weakness Enumeration

CWE-119

CWE-121

Related Identifiers

CVE-2026-2886

Affected Products

Tenda Ac21

References · 12

• 🔥 https://github.com/QIU-DIE/cve-nneeww/issues/6 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-2886 · Security Note
• https://osv.dev/vulnerability/CVE-2026-2886 · Vendor Advisory
• https://vuldb.com/?submit.754640 · Note
• https://t.me/cveNotify/152737 · Telegram Post
• https://twitter.com/CveFindCom/status/2025324848491135339 · Twitter Post
• https://tenda.com.cn · Note
• https://t.me/CVEtracker/45396 · Telegram Post
• https://twitter.com/CVEnew/status/2025425454640050497 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2025324043524571623 · Twitter Post
• https://vuldb.com/?id.347180 · Note
• https://vuldb.com/?ctiid.347180 · Note