CVE-2023-31724Public exploit

Process crash via null-pointer read in do_directive

Published May 17, 2023 · Updated Jan 22, 2025

Denial of service in Yasm 1.3.0.55.g101bc allows local users to crash the assembler by processing a crafted source file. The do_directive preprocessor function reads through a null pointer while handling the input, causing a segmentation fault. Exploitation requires Yasm to process attacker-controlled input; the public reproducer demonstrates process termination, not code execution.

CVSS severity7.8
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Yasm 1.3.0.55.g101bc allows local users to crash the assembler by processing a crafted source file. The do_directive preprocessor function reads through a null pointer while handling the input, causing a segmentation fault. Exploitation requires Yasm to process attacker-controlled input; the public reproducer demonstrates process termination, not code execution.

The record

CVE
CVE-2023-31724
Published
May 17, 2023
Updated
Jan 22, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 22, 2025Record 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

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1204.002User Execution: Malicious File

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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