CVE-2024-34020Public exploitNetwork attack vector

Process crash via unchecked putSDN index

Published Apr 29, 2024 · Updated Aug 2, 2024

Stack-based buffer overflow in hcode 2.1 and earlier allows attackers to crash the utility by supplying crafted input. In mail.c, putSDN uses static cp to index the 1,024-byte ibuf array and can increment cp twice after its range check, writing beyond the stack buffer. Processing the input requires user interaction; the published impact is limited to interruption of the hcode process, with no reported data disclosure or modification.

CVSS severity6.5
Medium
EPSS probability0.56%
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 hcode 2.1 and earlier allows attackers to crash the utility by supplying crafted input. In mail.c, putSDN uses static cp to index the 1,024-byte ibuf array and can increment cp twice after its range check, writing beyond the stack buffer. Processing the input requires user interaction; the published impact is limited to interruption of the hcode process, with no reported data disclosure or modification.

The record

CVE
CVE-2024-34020
Published
Apr 29, 2024
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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

4.3SUSECVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1499.004Application or System Exploitation

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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