What is CVE-2026-3398?

CVE-2026-3398 is a high-severity vulnerability in Tenda F453, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2026-03-01.

How severe is CVE-2026-3398?

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

Buffer overflow in Tenda F453

CVE-2026-3398

A vulnerability was determined in Tenda F453 1.0.0.3. Affected is the function fromAdvSetWan of the file /goform/AdvSetWan of the component httpd. Executing a manipulation of the argument wanmode/PPPOEPassword can lead to buffer overflow…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (28.3th 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-348293 | Tenda F453 httpd AdvSetWan fromAdvSetWan buffer overflow (vdb-entry, technical-description)
VDB-348293 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
Submit #759630 | Tenda F453 v1.0.0.3 Buffer Access Using Size of Source Buffer (third-party-advisory)
github.com/Litengzheng/vul_db/blob/main/F453/vul_82/README.md (exploit)
www.tenda.com.cn/ (product)

Frequently asked questions

What is CVE-2026-3398?: CVE-2026-3398 is a high-severity vulnerability in Tenda F453, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2026-03-01.
How severe is CVE-2026-3398?: High severity. CVSS v3 base score is 8.8 out of 10.