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.

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

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.

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

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