CVE-2026-112373
Deferred Deferred - Pending Action

Stack-Based Buffer Overflow in H3C Magic NX15

Vulnerability report for CVE-2026-112373, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-10-20

Last updated on: 2026-10-20

Assigner: VulDB

Description

A security vulnerability has been detected in H3C Magic NX15 NX15V100R017. This impacts the function sub_416874 of the file /usr/bin/usrlist. Such manipulation leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure.

CVSS Scores

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Meta Information

Published
2026-10-20
Last Modified
2026-10-20
Generated
2026-11-09
AI Q&A
2026-10-20
EPSS Evaluated
2026-11-07
NVD
EUVD

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
H3C Magic NX15 NX15V100R017

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
CWE-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

Attack-Flow Graph

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Executive Summary

This vulnerability is a stack-based buffer overflow in the H3C Magic NX15 router's /usr/bin/usrlist daemon. It occurs in the sub_416874 function where data read from /var/run/agentlist is copied into a 1024-byte stack buffer using strcat without bounds checking. If the total line length exceeds 1024 bytes, the buffer overflows, causing a crash-restart loop.

Detection Guidance

Check if the H3C Magic NX15 device is running firmware version NX15V100R017/R017. Monitor the /usr/bin/usrlist process for crashes or restart loops. Inspect logs for repeated respawns of the usrlist daemon. Use network traffic analysis to detect unusual patterns targeting the usrlist service.

Impact Analysis

The vulnerability causes a denial of service (DoS) by crashing and restarting the affected process repeatedly. It requires authentication to exploit and does not allow control-flow hijacking. The impact is limited to service disruption rather than data theft or system compromise.

Compliance Impact

This vulnerability causes a denial of service (DoS) due to a stack-based buffer overflow in the H3C Magic NX15 router, leading to persistent crashes. It does not allow control-flow hijacking or data exfiltration. Compliance impact may include disruptions to network availability, which could affect systems handling sensitive data under GDPR or HIPAA. However, the lack of data exposure or privilege escalation limits direct regulatory violations.

Mitigation Strategies

Apply the latest firmware update from H3C to patch the stack-based buffer overflow in /usr/bin/usrlist. Disable the usrlist service if not required. Restrict network access to the device to trusted sources only. Monitor for any signs of exploitation attempts or ongoing attacks.

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