Vulnerability · Published Feb 21, 2026 · Assigned by VulDB
CVE-2026-2886Tenda A21 SetOnlineDevName set_device_name stack-based overflow
High 8.8
In plain English
A high-severity stack buffer overflow in A21 from Tenda. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.6%top 48.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
Weakness: CWE-121, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
References
- VDB-347180 | Tenda A21 SetOnlineDevName set_device_name stack-based overflow vdb-entry, technical-description
- VDB-347180 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
- Submit #754640 | Tenda A21 V1.0.0.0 Stack-based Buffer Overflow third-party-advisory
- https://github.com/QIU-DIE/cve-nneeww/issues/6 exploit, issue-tracking
- https://www.tenda.com.cn/ product