Cyber Posture

CVE-2025-63409

High

Published: 24 February 2026

Published
24 February 2026
Modified
26 February 2026
KEV Added
—
Patch
—
CVSS Score 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0015 35.7th percentile
Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

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.

Mitigating Controls (NIST 800-53 r5)AI

AC-6 Least Privilege good match
prevent

Enforces least privilege to prevent low-privilege authenticated users from escalating to administrator actions like modifying settings or extracting credentials.

AC-3 Access Enforcement good match
prevent

Mandates enforcement of access control policies to block improper access by remote authenticated users to administrator-only functions.

SI-2 Flaw Remediation good match
prevent

Directly remediates the specific privilege escalation flaw in GCOM EPON 1GE C00R371V00B01 through timely flaw correction and patching.

Security SummaryAI

CVE-2025-63409 is a privilege escalation and improper access control vulnerability, mapped to CWE-284, in the GCOM EPON 1GE C00R371V00B01. This issue allows remote authenticated users to bypass restrictions and perform actions typically limited to administrators. The vulnerability received a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) and was published on 2026-02-24T16:24:06.990.

An attacker with low-privilege authenticated access over the network can exploit this vulnerability with low complexity and no user interaction required. Successful exploitation enables modification of administrator-only settings and extraction of administrator credentials, resulting in high impacts to confidentiality, integrity, and availability.

Mitigation details are available in advisories referenced at http://gcom.com and the disclosure repository at https://github.com/theShinigami/CVE-Disclosures/tree/main/CVE-2025-63409.

Details

CWE(s)
CWE-284

Affected Products

gcomtw
gcom epon 1ge firmware
c00r371v00b01

MITRE ATT&CK Enterprise TechniquesAI

T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
T1212 Exploitation for Credential Access Credential Access
Adversaries may exploit software vulnerabilities in an attempt to collect credentials.
attack.mitre.org →
Why these techniques?

Vulnerability enables privilege escalation (T1068), exploitation of remote services (T1210), and credential access via extraction of admin credentials (T1212).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

References