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Magic B1 CVE-2026-6581

| EUVD-2026-23716 HIGH
Classic Buffer Overflow (CWE-120)
2026-04-19 VulDB GHSA-wg8p-6252-5cpj
7.4
CVSS 4.0 · NVD
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Severity by source

NVD PRIMARY
7.4 HIGH
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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

8
PoC Detected
Apr 22, 2026 - 20:22 vuln.today
Public exploit code
Analysis Updated
Apr 19, 2026 - 23:27 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Apr 19, 2026 - 23:22 vuln.today
cvss_changed
CVSS changed
Apr 19, 2026 - 23:22 NVD
8.8 (HIGH) 7.4 (HIGH)
Analysis Generated
Apr 19, 2026 - 22:50 vuln.today
EUVD ID Assigned
Apr 19, 2026 - 22:45 euvd
EUVD-2026-23716
Analysis Generated
Apr 19, 2026 - 22:45 vuln.today
CVE Published
Apr 19, 2026 - 22:30 nvd
HIGH 7.4

DescriptionCVE.org

A vulnerability was detected in H3C Magic B1 up to 100R004. Affected by this vulnerability is the function SetMobileAPInfoById of the file /goform/aspForm. Performing a manipulation of the argument param results in buffer overflow. Remote exploitation of the attack is possible. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

AnalysisAI

Remote code execution in H3C Magic B1 router firmware versions up to 100R004 allows authenticated attackers to trigger a buffer overflow in the SetMobileAPInfoById function via crafted HTTP requests to /goform/aspForm. CVSS:4.0 rated 7.4 (High) with confirmed publicly available exploit code on GitHub. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Reconnaissance via internet scanning
Delivery
Authenticate with compromised/default credentials
Exploit
Send crafted POST to /goform/aspForm
Install
Trigger buffer overflow in SetMobileAPInfoById
C2
Execute arbitrary code as root
Execute
Install persistent backdoor
Impact
Intercept network traffic or pivot to LAN

Vulnerability AssessmentAI

Exploitation Requires low-privileged authentication (PR:L from CVSS vector) to the H3C Magic B1 web management interface - attacker must possess valid router login credentials before exploitation. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Real-world risk is ELEVATED. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker identifies H3C Magic B1 routers exposed on the internet through Shodan or Censys searches targeting characteristic HTTP response signatures. Using credentials obtained via default password lists, brute force, or credential stuffing databases, the attacker authenticates to the web management interface. …
Remediation No vendor-released patch identified at time of analysis - H3C did not respond to vulnerability disclosure per VulDB report (https://vuldb.com/vuln/358216). … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Identify all H3C Magic B1 routers running firmware 100R004 or earlier in your environment and disable remote management access; segment affected devices from critical network zones. …

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CVE-2026-6581 vulnerability details – vuln.today

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