# CVE-2026-9393: H3C Magic B0 buffer overflow in Edit_BasicSSID_5G

Source: https://junglewise.ai/threats/cve-2026-9393-h3c-magic-b0-buffer-overflow-in-edit-basicssid-5g  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-24. Updated: 2026-05-26  
License: CC BY 4.0 with a link back

CVE-2026-9393 · Severity: high · CVSS 8.8 · Published 2026-05-24

A security vulnerability exists in the H3C Magic B0 router, a device used for wireless networking. An attacker can exploit this flaw to crash the router's management interface or potentially take full control of the device. This could lead to a complete loss of internet connectivity for the network or unauthorized access to network traffic.

Vendors: [H3C](https://junglewise.ai/threats/vendors/h3c).

## Quick answers

**Is CVE-2026-9393 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9393 being exploited in the wild.

**How severe is CVE-2026-9393?** High severity, with a CVSS score of 8.8, published 24 May 2026.

**Which products and versions are affected?** H3C Magic B0 Router up to 100R002.

**Is there a fix for CVE-2026-9393?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-9393 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-9393?** Check whether you run H3C Magic B0 Router at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stack-based buffer overflow vulnerability exists in the H3C Magic B0 router (firmware <= 100R002). The flaw is located within the Edit_BasicSSID_5G function in the /goform/aspForm handler. The root cause is a lack of boundary checks when processing the 'param' argument, where user-supplied input is copied into a fixed-size buffer using unsafe memory operations. An authenticated attacker can trigger this vulnerability by sending a specially crafted POST request. Successful exploitation can lead to a crash of the web management service, device instability, or potential remote code execution. A public exploit (PoC) is available, and the vendor has not yet released a patch.

## Affected products

- H3C Magic B0 Router up to 100R002

## Timeline

- 2026-04-26: disclosed: Vulnerability details and PoC published on GitHub.
- 2026-05-24: advisory: CVE-2026-9393 published.

## References

- [https://github.com/alc9700jmo/CVE/issues/25](https://github.com/alc9700jmo/CVE/issues/25)
- [https://vuldb.com/submit/813477](https://vuldb.com/submit/813477)
- [https://vuldb.com/vuln/365374](https://vuldb.com/vuln/365374)
- [https://vuldb.com/vuln/365374/cti](https://vuldb.com/vuln/365374/cti)