CVE-2025-50399: fastcom fac1200r_firmware Classic Buffer Overflow
Analyzed
Published 26-11-2025Last modified 04-12-2025
Vulnerability summary
CVE-2025-50399 is a critical (CVSS 9.8) Classic Buffer Overflow vulnerability in fastcom fac1200r_firmware. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 35.4% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)EPSS score
0.42%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github
Timeline
- 26-11-2025PublishedVulnerability first disclosed.
- 04-12-2025Last modifiedVulnerability information updated.
Description
FAST FAC1200R F400_FAC1200R_Q is vulnerable to Buffer Overflow in the function sub_80435780 via the parameter password.
CVSS metrics
2 scores · 2 sources · 1 versionCritical 9.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 2 agree
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.42%
Chance of exploitation in the next 30 days
Percentile
35%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.42% on 22-09-2026
22-09-202622-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundIot Vul
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Fastcom1 product
- fac1200r_firmwaref400_fac1200r_q
1 vendor · 1 product