How severe is CVE-2025-63409?

CVE-2025-63409 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-63409 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-63409?

CVE-2025-63409 affects Gcomtw Gcom Epon 1ge Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-63409?

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

Does CVE-2025-63409 have an EU (EUVD) identifier?

Yes. CVE-2025-63409 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-208090.

When was CVE-2025-63409 published?

CVE-2025-63409 was published on 2026-02-24 and last updated on 2026-07-05.

CVE-2025-63409

CVE-2025-63409 is a high-severity vulnerability in Gcomtw Gcom Epon 1ge Firmware with a CVSS 3.x base score of 8.8. 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-284.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-208090
Weakness: CWE-284
Affected product: Gcomtw Gcom Epon 1ge Firmware
Published: 2026-02-24
Last modified: 2026-07-05

Description

Privilege escalation and improper access control in GCOM EPON 1GE C00R371V00B01 allows remote authenticated users to modify administrator only settings and extract administrator credentials.

Frequently asked questions

What is CVE-2025-63409?: Privilege escalation and improper access control in GCOM EPON 1GE C00R371V00B01 allows remote authenticated users to modify administrator only settings and extract administrator credentials.
How severe is CVE-2025-63409?: CVE-2025-63409 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-63409 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-63409?: CVE-2025-63409 affects Gcomtw Gcom Epon 1ge Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-63409?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-63409 have an EU (EUVD) identifier?: Yes. CVE-2025-63409 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-208090.
When was CVE-2025-63409 published?: CVE-2025-63409 was published on 2026-02-24 and last updated on 2026-07-05.

References

https://github.com/theShinigami/CVE-Disclosures/tree/main/CVE-2025-63409

EU advisories (EUVD)

http://gcom.com

Affected products (1)

cpe:2.3:o:gcomtw:gcom_epon_1ge_firmware:c00r371v00b01:*:*:*:*:*:*:*

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