Is CVE-2026-112373 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-112373 being exploited in the wild.

How severe is CVE-2026-112373?

Medium severity, with a CVSS score of 6.5, published 20 October 2026.

Is there a fix for CVE-2026-112373?

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-2026-112373 attacked?

It is attacked over the network.

Am I affected by CVE-2026-112373?

Check whether you run H3C Magic NX15 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-2026-112373: H3C Magic NX15 stack-based buffer overflow in usrlist

CVE-2026-112373 · Severity: medium · CVSS 6.5 · Published 2026-10-20

H3C Magic NX15 is a network router used in enterprise environments. A stack-based buffer overflow in the usrlist daemon allows an authenticated attacker to trigger a denial-of-service condition by causing the router process to crash repeatedly. The vulnerability could potentially be exploited for more severe impact beyond denial of service.

Technologies: H3C Magic NX15. Vendors: H3C.

Quick answers

Is CVE-2026-112373 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-112373 being exploited in the wild.
How severe is CVE-2026-112373?: Medium severity, with a CVSS score of 6.5, published 20 October 2026.
Which products and versions are affected?: H3C Magic NX15 NX15V100R017.
Is there a fix for CVE-2026-112373?: 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-2026-112373 attacked?: It is attacked over the network.
Am I affected by CVE-2026-112373?: Check whether you run H3C Magic NX15 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 exists in sub_416874 of /usr/bin/usrlist, where data from /var/run/agentlist is accumulated into a 1024-byte stack buffer without bounds checking, using strcat(). An authenticated attacker can write oversized data via the /api/esps endpoint to trigger the overflow. The process is respawned by procd, creating a crash-restart loop; while denial of service is confirmed, the binary lacks stack protection and FORTIFY_SOURCE, suggesting potential for control-flow hijacking.

Affected products

H3C Magic NX15 NX15V100R017

Timeline

2026-10-20: disclosed: Publicly disclosed with PoC

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.