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TI-2021-21215 Aliases CVE-2021-46394GHSA-qgw7-h965-2gp6

There is a stack buffer overflow vulnerability in the formSetPPTPServer function of…

Priority MEDIUM 47CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

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.

Why it matters now

EPSS 0.02738 86th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:tenda:ax3_firmware:16.03.12.10:*:*:*:*:*:*:*16.03.12.10VulnerableTenda
cpe:2.3:h:tenda:ax3:-:*:*:*:*:*:*:*not specified by NVDRunning onTenda
  • cpe:2.3:o:tenda:ax3_firmware:16.03.12.10:*:*:*:*:*:*:* Versions 16.03.12.10 Vulnerable ·Tenda
  • cpe:2.3:h:tenda:ax3:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Tenda

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-46394
  2. 2026-10-03 Alias added: GHSA-qgw7-h965-2gp6

References

Exploit 1

  • TI-2025-42929 Tenda AX3 firmware v16.03.12.11 contains a stack-based buffer overflow in the formGetIptv… CVSS 3.1CRITICAL 9.8
  • TI-2025-42927 Tenda AX3 firmware v16.03.12.11 contains a stack-based buffer overflow in the formGetIptv… CVSS 3.1CRITICAL 9.8
  • TI-2025-42926 Tenda AX3 firmware v16.03.12.11 contains a stack overflow in formSetIptv via the vlanId… CVSS 3.1CRITICAL 9.8
  • TI-2025-42925 Tenda AX3 firmware v16.03.12.11 contains a stack overflow in formSetIptv via the list… CVSS 3.1CRITICAL 9.8
  • TI-2023-28433 Tenda AX3 v16.03.12.11 was discovered to contain a remote code execution (RCE)… CVSS 3.1CRITICAL 9.8
  • TI-2023-09933 Tenda AX3 V16.03.12.11 was discovered to contain a stack overflow via the timeType function at /goform/SetSysTimeCfg. CVSS 3.1CRITICAL 9.8
See all 52 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences