CVE-2021-46394 json
There is a stack buffer overflow vulnerability in the formSetPPTPServer function of Tenda-AX3 router V16.03.12.10_CN.
published 2022-03-04 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-33073
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.7%
- EPSS 2.7% chance of exploitation in 30 days, percentile 86%
- public exploits
- 0
- none known
Summary
There is a stack buffer overflow vulnerability in the formSetPPTPServer function of Tenda-AX3 router V16.03.12.10_CN. The v13 variable is directly retrieved from the http request parameter startIp. Then v13 will be splice to stack by function sscanf without any security check, which causes stack overflow. By POSTing the page /goform/SetPptpServerCfg with proper startIp, the attacker can easily perform remote code execution with carefully crafted overflow data.
Exploit prediction
2.74% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/sec-bin/IoT-CVE/tree/main/Tenda/AX3/4 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
References
-
github.com
/sec-bin/IoT-CVE/tree/main/Tenda/AX3/4
exploit, third-party-advisory
Sources
- CVE List CVE-2021-46394
- NVD CVE-2021-46394
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