CVE-2023-34936Public exploitNetwork attack vector

Service restart via unbounded UpdateMacClone parameter copy

Published Jun 28, 2023 · Updated Nov 27, 2024

Stack overflow in UpdateMacClone in H3C Magic B1ST B1STV100R012 allows remote attackers to restart the web service via a crafted POST request. The handler at /goform/aspForm uses sscanf with an unbounded %s conversion to copy the param value into a fixed stack array. No authentication or user interaction is required; the demonstrated consequence is a restart of the webs process, not device reboot or code execution.

CVSS severity7.5
High
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in UpdateMacClone in H3C Magic B1ST B1STV100R012 allows remote attackers to restart the web service via a crafted POST request. The handler at /goform/aspForm uses sscanf with an unbounded %s conversion to copy the param value into a fixed stack array. No authentication or user interaction is required; the demonstrated consequence is a restart of the webs process, not device reboot or code execution.

The record

CVE
CVE-2023-34936
Published
Jun 28, 2023
Updated
Nov 27, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 27, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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