What is CVE-2025-12611?

CVE-2025-12611 is a high-severity vulnerability in Tenda Ac21, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2025-11-03.

How severe is CVE-2025-12611?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Tenda Ac21

CVE-2025-12611

A vulnerability was identified in Tenda AC21 16.03.08.16. This vulnerability affects the function formSetPPTPServer of the file /goform/SetPptpServerCfg. The manipulation of the argument startIp leads to buffer overflow. Remote exploitatio…

Vulnerability class: Buffer Overflow

EPSS: 0.002 (47.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). 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.

Affected products

Tenda Ac21 — versions 16.03.08.16

Weakness classification (CWE)

References

VDB-330906 | Tenda AC21 SetPptpServerCfg formSetPPTPServer buffer overflow (vdb-entry, technical-description)
VDB-330906 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
Submit #678491 | Tenda AC21 V16.03.08.16 Buffer Overflow (third-party-advisory)
github.com/LX-LX88/cve/issues/10 (broken-link, exploit, issue-tracking)
www.tenda.com.cn/ (product)

Frequently asked questions

What is CVE-2025-12611?: CVE-2025-12611 is a high-severity vulnerability in Tenda Ac21, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2025-11-03.
How severe is CVE-2025-12611?: High severity. CVSS v3 base score is 8.8 out of 10.