What is the CVSS score of CVE-2025-50399?

CVE-2025-50399 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Fac1200R Firmware are affected by CVE-2025-50399?

Organizations using FAST FAC1200R F400_FAC1200R_Q face critical risk from CVE-2025-50399, a buffer overflow vulnerability rated CVSS 9.8.

Is there a public PoC exploit available for CVE-2025-50399?

Yes, a public proof-of-concept exploit is available for CVE-2025-50399. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2025-50399?

Within 24 hours: Identify all affected systems and apply vendor patches immediately. If patching is delayed, consider network segmentation to limit exposure.

Fac1200R Firmware CVE-2025-50399

CRITICAL

Classic Buffer Overflow (CWE-120)

2025-11-26 cve@mitre.org

Buffer Overflow Fac1200R Firmware

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:24 vuln.today

PoC Detected

Jan 02, 2026 - 14:47 vuln.today

Public exploit code

CVE Published

Nov 26, 2025 - 16:15 nvd

CRITICAL 9.8

DescriptionCVE.org

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

AnalysisAI

FAST FAC1200R F400_FAC1200R_Q is vulnerable to Buffer Overflow in the function sub_80435780 via the parameter password. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Buffer Copy without Size Check (CWE-120), which allows attackers to overflow a buffer to corrupt adjacent memory. FAST FAC1200R F400_FAC1200R_Q is vulnerable to Buffer Overflow in the function sub_80435780 via the parameter password. Affected products include: Fastcom Fac1200R Firmware.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Always validate buffer sizes before copy operations. Use bounded functions (strncpy, snprintf). Enable compiler protections.

CVE-2025-50399 vulnerability details – vuln.today

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Fac1200R Firmware CVE-2025-50399

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

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External POC / Exploit Code