CVE-2025-5201Public exploit

Process crash via unchecked LWO2 polygon counts

Published May 26, 2025 · Updated May 28, 2025

Out-of-bounds read in Assimp 5.4.3 LWO parsing allows local users to crash an importing process with a malformed LWO2 file. CountVertsAndFacesLWO2 performs a two-byte memcpy without ensuring two bytes remain, then trusts an unchecked polygon index count to drive further variable-size reads. Exploitation requires local access to submit the file to an application using the library; the demonstrated consequence is process termination without reported data disclosure or modification.

CVSS severity7.8
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds read in Assimp 5.4.3 LWO parsing allows local users to crash an importing process with a malformed LWO2 file. CountVertsAndFacesLWO2 performs a two-byte memcpy without ensuring two bytes remain, then trusts an unchecked polygon index count to drive further variable-size reads. Exploitation requires local access to submit the file to an application using the library; the demonstrated consequence is process termination without reported data disclosure or modification.

The record

CVE
CVE-2025-5201
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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

1.7VulDBAV:L/AC:L/Au:S/C:N/I:N/A:P
4.8VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

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
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo