How severe is CVE-2025-50402?

CVE-2025-50402 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-50402 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-50402?

CVE-2025-50402 affects Fastcom Fac1200r Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-50402?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-50402 have an EU (EUVD) identifier?

Yes. CVE-2025-50402 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199731.

When was CVE-2025-50402 published?

CVE-2025-50402 was published on 2025-11-26 and last updated on 2026-06-17.

CVE-2025-50402

CVE-2025-50402 is a critical-severity vulnerability in Fastcom Fac1200r Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-199731
Weakness: CWE-120
Affected product: Fastcom Fac1200r Firmware
Published: 2025-11-26
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2025-50402?: FAST FAC1200R F400_FAC1200R_Q is vulnerable to Buffer Overflow in the function sub_80435780 via the parameter string fac_password.
How severe is CVE-2025-50402?: CVE-2025-50402 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-50402 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-50402?: CVE-2025-50402 affects Fastcom Fac1200r Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-50402?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-50402 have an EU (EUVD) identifier?: Yes. CVE-2025-50402 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199731.
When was CVE-2025-50402 published?: CVE-2025-50402 was published on 2025-11-26 and last updated on 2026-06-17.

References

https://github.com/sezangel/IOT-vul/tree/main/FAST/FAC1200R/2

Affected products (1)

cpe:2.3:o:fastcom:fac1200r_firmware:f400_fac1200r_q:*:*:*:*:*:*:*

More vulnerabilities in Fastcom Fac1200r Firmware

CVE-2025-50399 — Critical (CVSS 9.8): FAST FAC1200R F400_FAC1200R_Q is vulnerable to Buffer Overflow in the function sub_80435780 via the parameter password.

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