What is CVE-2025-63409?

CVE-2025-63409 is a high-severity vulnerability in Gcomtw Gcom Epon 1ge, classified under Improper Access Control. CVSS score: 8.8/10. Published 2026-02-24.

How severe is CVE-2025-63409?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Gcomtw Gcom Epon 1ge

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.

Published 2026-02-24 · last modified 2026-07-05.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (19.2th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Gcomtw Gcom Epon 1ge
Gcomtw Gcom Epon 1ge Firmware — versions c00r371v00b01

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

gcom.com (Broken Link)
github.com/theShinigami/CVE-Disclosures/tree/main/CVE-2025-63409 (Third Party Advisory)

Frequently asked questions

What is CVE-2025-63409?: CVE-2025-63409 is a high-severity vulnerability in Gcomtw Gcom Epon 1ge, classified under Improper Access Control. CVSS score: 8.8/10. Published 2026-02-24.
How severe is CVE-2025-63409?: High severity. CVSS v3 base score is 8.8 out of 10.