CVE-2026-6581
Published: 19 April 2026
Summary
CVE-2026-6581 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability. Its CVSS base score is 7.4 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 35.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-16 (Memory Protection).
Deeper analysis
CVE-2026-6581 is a buffer overflow vulnerability affecting H3C Magic B1 devices up to version 100R004. The issue resides in the SetMobileAPInfoById function within the /goform/aspForm file, where manipulation of the "param" argument triggers the overflow. Classified under CWE-119 and CWE-120, it carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) and was published on 2026-04-19.
The vulnerability enables remote exploitation by attackers with low privileges (PR:L) over the network with low complexity and no user interaction required. Successful exploitation grants high-impact access to confidentiality, integrity, and availability, potentially allowing arbitrary code execution or system compromise on affected devices.
Advisories from VulDB indicate that the vendor was contacted early but provided no response, with no patches or mitigations disclosed. An exploit is publicly available, including details on GitHub at https://github.com/hmKunlun/H3Cc/blob/main/h3c.md and VulDB entries at https://vuldb.com/vuln/358216.
In notable context, the public exploit availability increases the risk of active misuse against unpatched H3C Magic B1 deployments.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-23716
Vulnerability details
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…
more
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.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Buffer overflow in the web management interface (/goform/aspForm) of a network device directly enables remote exploitation of a public-facing application (T1190) for arbitrary code execution.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly prevents buffer overflow by enforcing input validation on the 'param' argument at web form entry points like /goform/aspForm.
Implements memory protections such as ASLR and non-executable memory to block arbitrary code execution from buffer overflow exploitation.
Requires timely remediation of known flaws like this buffer overflow vulnerability through patching or compensatory controls on affected H3C devices.