CVE-2023-34934Public exploitNetwork attack vector

Unauthenticated web-service restart via unbounded sscanf

Published Jun 28, 2023 · Updated Nov 27, 2024

Stack-based buffer overflow in H3C Magic B1ST firmware B1STV100R012 allows remote attackers to restart its web service via a crafted POST request. The Edit_BasicSSID_5G handler at /goform/aspForm copies the param value into stack array v33 with an sscanf %[^;] conversion that imposes no length limit. No authentication is required, and an oversized param value restarts the webs process, interrupting the router management service.

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-based buffer overflow in H3C Magic B1ST firmware B1STV100R012 allows remote attackers to restart its web service via a crafted POST request. The Edit_BasicSSID_5G handler at /goform/aspForm copies the param value into stack array v33 with an sscanf %[^;] conversion that imposes no length limit. No authentication is required, and an oversized param value restarts the webs process, interrupting the router management service.

The record

CVE
CVE-2023-34934
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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