Staging Environment: Content and features may be unstable or change without notice.
Advisory details: pypa / pyassimp/PYSEC-2025-171
Advisory ID pypa/pyassimp/PYSEC-2025-171
Aliases CVE-2025-3549
PYSEC-2025-171
Summary A vulnerability, which was classified as critical, was found in Open Asset Import Library Assimp 5.4.3. Affected is the function Assimp::MD3Importer::ValidateSurfaceHeaderOffsets of the file code/AssetLib/MD3/MD3Loader.cpp of the component File Handler. The manipulation leads to heap-based buffer overflow. The attack needs to be approached locally. The exploit has been disclosed to the public and may be used.
Status Published
Exploitability 0.5
Weighted Severity 3.0
Risk 1.5
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (0)
There are no known CWE.
System Score Found at
cvssv3.1 3.3 https://github.com/pypa/advisory-database/blob/main/vulns/pyassimp/PYSEC-2025-171.yaml
Reference id Reference type URL
6070 Bug https://github.com/assimp/assimp/issues/6070
Assimp_MD3Importer_ValidateSurfaceHeaderOffsets-hbo.zip Exploit https://github.com/user-attachments/files/19580481/Assimp_MD3Importer_ValidateSurfaceHeaderOffsets-hbo.zip
?ctiid.304590 Other https://vuldb.com/?ctiid.304590
?id.304590 Advisory https://vuldb.com/?id.304590
?submit.546414 Advisory https://vuldb.com/?submit.546414
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L Found at https://github.com/pypa/advisory-database/blob/main/vulns/pyassimp/PYSEC-2025-171.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-14T14:41:34Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2025/3xxx/CVE-2025-3549.json

Source Advisory: vulnrichment/CVE-2025-3549

View SSVC decision tree 
[{'Exploitation': 'poc'},
 {'Automatable': 'no'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]