Staging Environment: Content and features may be unstable or change without notice.
Advisory details: pypa / pyassimp/PYSEC-2025-173
Advisory ID pypa/pyassimp/PYSEC-2025-173
Aliases CVE-2025-5166
PYSEC-2025-173
Summary A vulnerability was found in Open Asset Import Library Assimp 5.4.3. It has been classified as problematic. Affected is the function MDCImporter::InternReadFile of the file assimp/code/AssetLib/MDC/MDCLoader.cpp of the component MDC File Parser. The manipulation of the argument pcVerts leads to out-of-bounds read. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used. The project decided to collect all Fuzzer bugs in a main-issue to address them in the future.
Status Published
Exploitability 0.5
Weighted Severity 5.0
Risk 2.5
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 5.5 https://github.com/pypa/advisory-database/blob/main/vulns/pyassimp/PYSEC-2025-173.yaml
Reference id Reference type URL
6128 Bug https://github.com/assimp/assimp/issues/6128
6168 Bug https://github.com/assimp/assimp/issues/6168
?ctiid.310254 Other https://vuldb.com/?ctiid.310254
?id.310254 Advisory https://vuldb.com/?id.310254
reproducer.zip Exploit https://github.com/user-attachments/files/20208318/reproducer.zip
?submit.578001 Advisory https://vuldb.com/?submit.578001
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:H Found at https://github.com/pypa/advisory-database/blob/main/vulns/pyassimp/PYSEC-2025-173.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/2025-05-27T14:19:55Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2025/5xxx/CVE-2025-5166.json

Source Advisory: vulnrichment/CVE-2025-5166

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