CVE-2026-6560
Published: 19 April 2026
Summary
CVE-2026-6560 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 37.7th 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-2026-6560 is a buffer overflow vulnerability affecting H3C Magic B0 devices up to version 100R002. The issue resides in the Edit_BasicSSID function within the /goform/aspForm file, where manipulation of the "param" argument triggers the overflow. Classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-120 (Buffer Copy without Checking Size of Input), 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), indicating high severity due to its potential for remote exploitation.
Attackers with low privileges (PR:L) and network access can exploit this vulnerability remotely with low complexity and no user interaction required. Successful exploitation allows arbitrary code execution, leading to high impacts on confidentiality, integrity, and availability, such as full system compromise on the affected device.
References, including a GitHub vulnerability report and VulDB entries, confirm the exploit has been publicly disclosed and may be actively used. The vendor was notified early but provided no response, and no patches or official mitigations are mentioned in available advisories. Security practitioners should isolate affected devices, monitor for exploitation attempts targeting the /goform/aspForm endpoint, and consider network segmentation until further vendor guidance emerges.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-23684
Vulnerability details
A security vulnerability has been detected in H3C Magic B0 up to 100R002. This vulnerability affects the function Edit_BasicSSID of the file /goform/aspForm. Such manipulation of the argument param leads to buffer overflow. The attack can be executed remotely. The…
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exploit has been disclosed publicly 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 public web form (/goform/aspForm) directly enables remote code execution on the device via exploitation of a public-facing application.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly prevents buffer overflow exploitation by validating the 'param' argument in the Edit_BasicSSID function of /goform/aspForm.
Protects against arbitrary code execution resulting from the buffer overflow through memory safeguards like DEP or stack canaries.
Mandates timely flaw remediation to patch or mitigate the known buffer overflow vulnerability in H3C Magic B0 devices.