What is CVE-2023-38940?

CVE-2023-38940 is a critical-severity vulnerability in Tenda F1203, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2023-08-07.

How severe is CVE-2023-38940?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Tenda F1203

CVE-2023-38940

Tenda F1203 V2.0.1.6, FH1203 V2.0.1.6 and FH1205 V2.0.0.7(775) were discovered to contain a stack overflow via the ssid parameter in the form_fast_setting_wifi_set function.

Vulnerability class: Buffer Overflow

Published 2023-08-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (56.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Tenda F1203
Tenda F1203 Firmware — versions 2.0.1.6
Tenda Fh1203
Tenda Fh1203 Firmware — versions 2.0.1.6
Tenda Fh1205
Tenda Fh1205 Firmware — versions 2.0.0.7\(775\), 2.0.0.7(775)

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/FirmRec/IoT-Vulns/tree/main/tenda/form_fast_setting_wifi_set (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2023-38940?: CVE-2023-38940 is a critical-severity vulnerability in Tenda F1203, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2023-08-07.
How severe is CVE-2023-38940?: Critical severity. CVSS v3 base score is 9.8 out of 10.