EUVD-2026-31549
GHSA-mx2p-2hcq-xr76
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
A vulnerability was found in H3C Magic B0 up to 100R002. This affects the function Edit_BasicSSID_5G of the file /goform/aspForm. Performing a manipulation of the argument param results in buffer overflow. The attack may be initiated remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.
AnalysisAI
Buffer overflow in the H3C Magic B0 router (firmware up to 100R002) allows authenticated remote attackers to corrupt memory via the param argument handled by the Edit_BasicSSID_5G function in /goform/aspForm, leading to high impact on confidentiality, integrity, and availability. Publicly available exploit code exists per VulDB, though EPSS remains very low (0.04%, 13th percentile) and the issue is not listed in CISA KEV, indicating no public exploit identified as actively used at time of analysis. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Attacker must reach the router's HTTP management interface (/goform/aspForm) over the network and must already hold low-privileged authenticated access to the web UI (CVSS PR:L) - typically a valid web admin or guest-admin account, which on SOHO devices is often default/weak credentials. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H) describes a low-complexity network-reachable attack requiring low privileges and no user interaction, with high impact on the vulnerable component but no scope change to other systems - yielding a base score of 7.4. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained low-privileged web UI credentials on an H3C Magic B0 router - for example via default or reused credentials on a LAN-reachable or WAN-exposed admin portal - sends a crafted POST to /goform/aspForm targeting Edit_BasicSSID_5G with an oversized param value. Publicly available exploit code (referenced at https://github.com/alc9700jmo/CVE/issues/25) demonstrates the buffer overflow, which can crash the router or, with reliable offsets for the specific firmware build, execute attacker-controlled code as the web service user, giving full control of the gateway and the LAN behind it. |
| Remediation | No vendor-released patch identified at time of analysis - H3C did not respond to coordinated disclosure, so defenders should treat affected Magic B0 devices (firmware up to 100R002) as unpatched and apply compensating controls. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and inventory all H3C Magic B0 routers; document firmware versions (up to 100R002); isolate affected devices using network segmentation. …
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External POC / Exploit Code
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