CVE-2026-8764 Details
Description
A security vulnerability has been detected in H3C Magic B3 up to 100R002. This affects the function UpdateWanParams of the file /goform/aspForm. Such manipulation of the argument param leads to buffer overflow. The attack may be performed from remote. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
A buffer overflow vulnerability has been identified in the H3C Magic B3 router, affecting firmware versions through 100R002. The issue arises in the UpdateWanParams function within the /goform/aspForm file, where improper validation of the 'param' argument allows for remote exploitation. This vulnerability can lead to a denial-of-service condition and, under certain circumstances, may be exploited for remote code execution.
Users are advised to upgrade to a secure firmware version as soon as possible. The vendor should release a patched version that addresses the vulnerability by implementing proper input validation and memory management. Additionally, enabling security features like stack protection and FORTIFY_SOURCE during compilation can help mitigate similar vulnerabilities.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 17, 2026CISA-ADP
Assessed May 18, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/yyyy0031/CVE/issues/1 | [email protected] | ExploitTechnical Description |
| https://vuldb.com/submit/811373 | [email protected] | Permission Required |
| https://vuldb.com/vuln/364389 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/364389/cti | [email protected] | AdvisoryPermission Required |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-119 | Improper Restriction of Operations within the Bounds of a Memory Buffer | [email protected] |
| CWE-120 | Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| H3C Magic B3 | <= 100R002 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 17, 2026 | New CVE Received | [email protected] |