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Huawei EG8141A5 devices through V5R019C00S100, EG8145V5 devices through V5R019C00S100, and EG8145V5-V2 devices through V5R021C00S184 allow the Epuser account to disable ONT firewall functionality, e.g., to remove the default blocking of the SSH and TELNET TCP ports, aka HWNO-56Q3.

CVE-2025-49599 is a medium-severity security vulnerability affecting Huawei optical network terminal (ONT) devices, specifically the EG8141A5, EG8145V5, and EG8145V5-V2 models running firmware versions up to V5R019C00S100 and V5R021C00S184 respectively. The vulnerability arises from incorrect authorization controls (CWE-863) related to the 'Epuser' account on these devices. This account is able to disable the ONT's firewall functionality, which by default blocks critical TCP ports such as SSH (port 22) and TELNET (port 23). By disabling these protections, an attacker with access to the Epuser account can expose the device to remote access attempts via these protocols, which are often targeted for exploitation due to their history of weak authentication and known vulnerabilities. The CVSS 3.1 base score of 4.1 reflects a medium severity, with the vector indicating that the attack requires low complexity, privileges (PR:L) on the device, no user interaction, and affects the integrity of the device configuration without impacting confidentiality or availability. The scope is changed (S:C), meaning the vulnerability affects components beyond the initially vulnerable component. No known exploits are currently reported in the wild, and no patches are listed, indicating that mitigation may require vendor intervention or configuration changes. This vulnerability is significant because ONT devices serve as the demarcation point between customer premises and the service provider network, and weakening their firewall can lead to unauthorized access, lateral movement, or further compromise of the home or enterprise network.

Detailed information about CVE-2025-49599: CWE-863 Incorrect Authorization in Huawei EG8141A5 affecting Huawei EG8141A5. Get real-time updates, technical detail

CVE-2025-49599: CWE-863 Incorrect Authorization in Huawei EG8141A5 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-49599: CWE-863 Incorrect Authorization in Huawei EG8141A5

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