CVE-2021-46394: tenda ax3_firmware Out-of-bounds Write
Vulnerability summary
CVE-2021-46394 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in tenda ax3_firmware. EPSS estimates a 2.74% chance of exploitation in the next 30 days, higher than 86% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 04-03-2022PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
2 scores · 1 source · 2 versionsEPSS trend
Probability
2.74%
Chance of exploitation in the next 30 days
Percentile
86%
Versus all other CVEs
30-day change
No change 0.00 pp
From 2.74% on 22-09-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundIot Cve
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Tenda1 product
- ax3_firmware16.03.12.10
1 vendor · 1 product