What is CVE-2025-50399?

CVE-2025-50399 is a critical-severity vulnerability in Fastcom Fac1200r, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2025-11-26.

How severe is CVE-2025-50399?

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

Buffer overflow in Fastcom Fac1200r

CVE-2025-50399

FAST FAC1200R F400_FAC1200R_Q is vulnerable to Buffer Overflow in the function sub_80435780 via the parameter password.

Vulnerability class: Buffer Overflow

EPSS: 0.004 (33.9th percentile) — read the EPSS interpretation.

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.

Affected products

Fastcom Fac1200r
Fastcom Fac1200r_firmware — versions f400_fac1200r_q
N/a — versions n/a

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

cve@mitre.org (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-50399?: CVE-2025-50399 is a critical-severity vulnerability in Fastcom Fac1200r, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2025-11-26.
How severe is CVE-2025-50399?: Critical severity. CVSS v3 base score is 9.8 out of 10.