CVE-2025-5156: A vulnerability was found in H3C GR-5400AX up to 100R008 and classified as critical

Q: How do I fix CVE-2025-5156?

gr-5400ax firmware: upgrade to newer than 100R008. Exact commands for each OS are on this page.

Q: Is CVE-2025-5156 being exploited?

CVE-2025-5156 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-5156 affect?

CVE-2025-5156 affects gr-5400ax firmware. Severity is high (CVSS 8.8). A vulnerability was found in H3C GR-5400AX up to 100R008 and classified as critical. Affected by this issue is the function EditWlanMacList of the file /routing/goform/aspForm. The manipulation of the argument param leads to buffer overflow

This month

HIGH 8.8UPGRADE

CVE-2025-5156 is a high-severity flaw (CVSS 8.8) affecting gr-5400ax firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was found in H3C GR-5400AX up to 100R008 and classified as critical. Affected by this issue is the function EditWlanMacList of the file /routing/goform/aspForm. The manipulation of the argument param leads to buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.9% (top 39%)
CISA exploited list	No
Weakness	CWE-119, CWE-120
Published	2025-05-25
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: h3c

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-05-25 22:15 UTCPublished CVE record published
2026-06-17 09:47 UTCUpdated Record last modified

h3c gr-5400ax firmware UPGRADE

Affected: <= 100R008

Fixed in: newer than 100R008

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-5156?

gr-5400ax firmware: upgrade to newer than 100R008. Exact commands for each OS are on this page.

Is CVE-2025-5156 being exploited?

CVE-2025-5156 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-5156 affect?

CVE-2025-5156 affects gr-5400ax firmware. Severity is high (CVSS 8.8). A vulnerability was found in H3C GR-5400AX up to 100R008 and classified as critical. Affected by this issue is the function EditWlanMacList of the file /routing/goform/aspForm. The manipulation of the argument param leads to buffer overflow

How urgent is CVE-2025-5156?

Priority 46/100. High severity

References

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