PT-2026-5370 · Tenda · Tenda Ac21

Lx-Lx · Published 2026-01-29 · Updated 2026-01-30 · CVE-2026-1637

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 AC21 version 16.03.08.16

Description A stack-based buffer overflow exists in the fromAdvSetMacMtuWan function located in the /goform/AdvSetMacMtuWan file. This allows for remote exploitation. The exploit is publicly available.

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

Exploit

Fix

Buffer Overflow

Stack Overflow

Weakness Enumeration

CWE-119

CWE-121

Related Identifiers

BDU:2026-01062

CVE-2026-1637

Affected Products

Tenda Ac21

References · 14

• 🔥 https://github.com/LX-LX88/cve/issues/25 · Exploit
• https://osv.dev/vulnerability/CVE-2026-1637 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-01062 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-1637 · Security Note
• https://vuldb.com/?submit.740865 · Note
• https://twitter.com/vuldb/status/2016959835083067730 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2017057691785416779 · Twitter Post
• https://t.me/CVEtracker/43261 · Telegram Post
• https://twitter.com/CVEnew/status/2017008600753832285 · Twitter Post
• https://tenda.com.cn · Note
• https://t.me/cveNotify/150335 · Telegram Post
• https://twitter.com/CveFindCom/status/2017027790818640175 · Twitter Post
• https://vuldb.com/?id.343416 · Note
• https://vuldb.com/?ctiid.343416 · Note