Vulnerability · Published Feb 21, 2026 · Assigned by VulDB
CVE-2026-2873Tenda A21 openSchedWifi setSchedWifi 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 vulnerability was detected in Tenda A21 1.0.0.0. This issue affects the function setSchedWifi of the file /goform/openSchedWifi. Performing a manipulation of the argument schedStartTime/schedEndTime results in stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit is now public and may be used.
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-347110 | Tenda A21 openSchedWifi setSchedWifi stack-based overflow vdb-entry, technical-description
- VDB-347110 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
- Submit #754635 | Tenda A21 V1.0.0.0 Stack-based Buffer Overflow third-party-advisory
- https://github.com/QIU-DIE/cve-nneeww/issues/4 exploit, issue-tracking
- https://www.tenda.com.cn/ product