CVE-2023-29579Public exploit

Process crash via x86 CPU directive overflow

Published Apr 24, 2023 · Updated Aug 2, 2024

Stack overflow in Yasm 1.3.0.55.g101bc allows local users to crash the assembler by processing a crafted assembly file. In x86_dir_cpu, sprintf writes 21 bytes into the 16-byte strcpu stack buffer while the NASM parser handles an x86 CPU directive. A user must run Yasm on the file, and the issue is disputed because the standalone assembler is not intended to process untrusted input.

CVSS severity5.5
Medium
EPSS probability0.30%
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 Yasm 1.3.0.55.g101bc allows local users to crash the assembler by processing a crafted assembly file. In x86_dir_cpu, sprintf writes 21 bytes into the 16-byte strcpu stack buffer while the NASM parser handles an x86 CPU directive. A user must run Yasm on the file, and the issue is disputed because the standalone assembler is not intended to process untrusted input.

The record

CVE
CVE-2023-29579
Published
Apr 24, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 24, 2023CVE 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 vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

0.0SUSECVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:N
5.5NIST National Vulnerability DatabaseCVSS:3.1/AV:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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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