CVE-2025-5167Public exploit

Local crash via unterminated LWO string

Published May 26, 2025 · Updated May 28, 2025

Out-of-bounds read in Assimp 5.4.3 allows local users to crash an importing process with a crafted, unterminated LWO string. LWOImporter::GetS0 checks the maximum length but continues dereferencing the input buffer until a null byte, reading one byte beyond a nonterminated allocation. Exploitation requires causing an application linked to Assimp to import the malicious LWO data; the published reproduction terminates an AddressSanitizer-instrumented process.

CVSS severity5.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Assimp 5.4.3 allows local users to crash an importing process with a crafted, unterminated LWO string. LWOImporter::GetS0 checks the maximum length but continues dereferencing the input buffer until a null byte, reading one byte beyond a nonterminated allocation. Exploitation requires causing an application linked to Assimp to import the malicious LWO data; the published reproduction terminates an AddressSanitizer-instrumented process.

The record

CVE
CVE-2025-5167
Published
May 26, 2025
Updated
May 28, 2025
Vendor
Open Asset Import Library
Product
Assimp
Classifications
CWE-119, CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 28, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.4.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Open Asset Import Library · Assimpversion=5.4.3

Published CVSS scores

3.3VulDB CNACVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
3.3VulDB CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
4.8VulDB CNACVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
1.7VulDB CNAAV:L/AC:L/Au:S/C:N/I:N/A:P

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-125Out-of-Bounds Read

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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