Buffer overflow in Tenda F453
CVE-2026-5021
A flaw has been found in Tenda F453 1.0.0.3. This affects the function fromPPTPUserSetting of the file /goform/PPTPUserSetting of the component httpd. This manipulation of the argument delno causes stack-based buffer overflow. Remote explo…
Vulnerability class: Buffer Overflow
EPSS: 0.001 (25.8th 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 F453 — versions 1.0.0.3
Weakness classification (CWE)
References
- VDB-353906 | Tenda F453 httpd PPTPUserSetting fromPPTPUserSetting stack-based overflow (vdb-entry, technical-description)
- VDB-353906 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
- Submit #778415 | Tenda F453 v1.0.0.3 Stack-based Buffer Overflow (third-party-advisory)
- github.com/Litengzheng/vul_db/blob/main/F453/vul_92/README.md (exploit)
- www.tenda.com.cn/ (product)
Frequently asked questions
- What is CVE-2026-5021?
- CVE-2026-5021 is a high-severity vulnerability in Tenda F453, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-03-29.
- How severe is CVE-2026-5021?
- High severity. CVSS v3 base score is 8.8 out of 10.