CVE-2025-5202Public exploit

Process crash via unchecked Half-Life MDL header

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 via a truncated Half-Life MDL file. HL1MDLLoader::validate_header reads the header->numbodyparts field without first verifying that the input buffer contains a complete header. Low-privileged local access and processing of the crafted file are required; the demonstrated result is an AddressSanitizer abort.

CVSS severity4.8
Medium
EPSS probability0.27%
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 via a truncated Half-Life MDL file. HL1MDLLoader::validate_header reads the header->numbodyparts field without first verifying that the input buffer contains a complete header. Low-privileged local access and processing of the crafted file are required; the demonstrated result is an AddressSanitizer abort.

The record

CVE
CVE-2025-5202
Published
May 26, 2025
Updated
May 28, 2025
Vendor
Open Asset Import Library
Product
Assimp
Classifications
CWE-125, CWE-119
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

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
3.3VulDB CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
3.3VulDB CNACVSS:3.0/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

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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