CVE-2025-65221: tenda ac21_firmware Stack-based Buffer Overflow
CVSS: 4.3v3.1MediumAnalyzed
Published 20-11-2025Last modified 20-11-2025
Vulnerability summary
CVE-2025-65221 is a medium (CVSS 4.3) Stack-based Buffer Overflow vulnerability in tenda ac21_firmware. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 23.1% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
4.3/10
010
Medium · v3.1 (CVE.org)EPSS score
0.32%
0%100%
Low · +0.02 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Timeline
- 20-11-2025PublishedVulnerability first disclosed.
- 20-11-2025Last modifiedVulnerability information updated.
Description
Tenda AC21 V16.03.08.16 is vulnerable to Buffer Overflow via the list parameter of /goform/setPptpUserList.
CVSS metrics
2 scores · 2 sources · 1 versionMedium 4.3Preferred score · CVE.org (CNA)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LSourcesAll 2 agree
- NVDNIST4.3MediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS trend
Probability
0.32%
Chance of exploitation in the next 30 days
Percentile
23%
Versus all other CVEs
30-day change
+0.02 pp
From 0.29% on 21-09-2026
21-09-202621-10-2026
EPSS score0.32%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundMy Vuln 2
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Tenda1 product
- ac21_firmware16.03.08.16
1 vendor · 1 product