What is CVE-2025-65221?

CVE-2025-65221 is a medium-severity vulnerability in Tenda Ac21, classified under Stack-based Buffer Overflow. CVSS score: 4.3/10. Published 2025-11-20.

How severe is CVE-2025-65221?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Buffer overflow in Tenda Ac21

CVE-2025-65221

Tenda AC21 V16.03.08.16 is vulnerable to Buffer Overflow via the list parameter of /goform/setPptpUserList.

Vulnerability class: Buffer Overflow

Published 2025-11-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.003 (19.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Tenda Ac21
Tenda Ac21 Firmware — versions 16.03.08.16

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

github.com/Madgeaaaaa/MY_VULN_2/blob/main/Tenda/VULN2.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-65221?: CVE-2025-65221 is a medium-severity vulnerability in Tenda Ac21, classified under Stack-based Buffer Overflow. CVSS score: 4.3/10. Published 2025-11-20.
How severe is CVE-2025-65221?: Medium severity. CVSS v3 base score is 4.3 out of 10.