CVE-2025-6090 Overview
CVE-2025-6090 is a buffer overflow vulnerability affecting the H3C GR-5400AX router running firmware version V100R009L50. The flaw resides in the UpdateWanparamsMulti and UpdateIpv6params functions within /routing/goform/aspForm. Attackers can trigger the overflow by manipulating the param argument in HTTP requests to the affected endpoint. The vulnerability is remotely exploitable and requires low privileges. Public exploit details have been disclosed, increasing the risk of opportunistic exploitation. The vendor has confirmed the issue but assesses the risk as low and has no immediate plans for remediation, leaving affected devices exposed. This vulnerability is categorized under [CWE-119] — improper restriction of operations within the bounds of a memory buffer.
Critical Impact
Remote attackers with low privileges can trigger a buffer overflow in the H3C GR-5400AX web management interface, potentially leading to memory corruption and code execution on the router.
Affected Products
- H3C GR-5400AX router
- Firmware version V100R009L50
- Web management interface component /routing/goform/aspForm
Discovery Timeline
- 2025-06-15 - CVE-2025-6090 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-6090
Vulnerability Analysis
The vulnerability affects the aspForm handler within the router's web management interface. Two functions, UpdateWanparamsMulti and UpdateIpv6params, process user-supplied input from the param argument without adequate bounds checking. When an attacker submits an oversized value, the input overflows the destination buffer and corrupts adjacent memory. The flaw is reachable over the network, and exploitation requires only low-privileged access to the router interface. Successful exploitation can compromise confidentiality, integrity, and availability of the device. Public disclosure of exploit details raises the likelihood of automated scanning and exploitation against exposed devices. The vendor has confirmed the issue but declined to release a patch, citing a low internal risk assessment.
Root Cause
The root cause is improper input length validation in the UpdateWanparamsMulti and UpdateIpv6params functions. Both routines copy the param value into a fixed-size stack or heap buffer without verifying its length. This classic [CWE-119] pattern allows adjacent memory structures, including saved return addresses and function pointers, to be overwritten.
Attack Vector
An authenticated attacker sends a crafted HTTP request to /routing/goform/aspForm with an oversized param value. The request targets either UpdateWanparamsMulti or UpdateIpv6params processing paths. Because the interface is accessible over the network, an attacker who obtains low-privileged web credentials, or reaches an exposed management interface, can trigger the overflow remotely. The vulnerability manifests during input parsing within the goform handler. Refer to the public advisory on GitHub and the VulDB entry #312557 for exploit specifics.
Detection Methods for CVE-2025-6090
Indicators of Compromise
- HTTP POST requests to /routing/goform/aspForm containing unusually long param values.
- Unexpected reboots, crashes, or service restarts on H3C GR-5400AX devices.
- Anomalous outbound connections originating from the router management plane.
- Presence of new administrative sessions or configuration changes without authorization.
Detection Strategies
- Inspect HTTP traffic to router management interfaces for oversized parameters targeting aspForm endpoints.
- Deploy network intrusion detection signatures matching UpdateWanparamsMulti and UpdateIpv6params with abnormally long input.
- Correlate router log entries with authentication events to identify low-privileged accounts issuing unusual configuration requests.
Monitoring Recommendations
- Forward router syslog and management-plane access logs to a centralized SIEM for continuous review.
- Alert on repeated failed or malformed POSTs to /routing/goform/aspForm.
- Monitor for unexpected device restarts or degraded performance that may indicate exploitation attempts.
How to Mitigate CVE-2025-6090
Immediate Actions Required
- Restrict access to the router's web management interface to trusted management networks only.
- Disable remote WAN-side administration on the H3C GR-5400AX.
- Rotate all administrative credentials and enforce strong passwords to limit low-privileged access abuse.
- Segment the router management VLAN from general user and guest networks.
Patch Information
The vendor has confirmed the vulnerability but has stated they do not plan immediate remediation because they assess the risk as low. No official patch is available at the time of this writing. Consult the VulDB CTI report #312557 and monitor the H3C security advisories for future updates.
Workarounds
- Place the router behind an upstream firewall that blocks unsolicited access to the management interface.
- Consider replacing the affected device with a supported model if the vendor does not release a patch.
- Apply strict ACLs limiting HTTP/HTTPS access to /routing/goform/aspForm to trusted administrator hosts.
- Continuously monitor the device for anomalous behavior and be prepared to isolate it if exploitation is suspected.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
