Open Asset Import Library Assimp MDC File Parser MDCLoader.cpp InternReadFile out-of-bounds
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.
- Published
- May 26, 2025
- Updated
- Jun 17, 2026
- EPSS
- 0.3% · 15th percentile
- CWE
- CWE-119
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Report tools
Action score
19
Monitor
Low priority for now.
- CVSS
- 19 / 40 · 4.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.3%
CISA SSVC decision
- Exploitation
- proof of concept
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · VulDB
- 4.8
- NVD has not scored this yet; the score shown is the CNA’s.
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| assimp | assimp | cpe:2.3:a:assimp:assimp |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- assimp assimp5.4.3
Versions reported by the vendor
Affected version ranges reported by the assigning authority (VulDB). Independent of NVD's CPE analysis and usually ahead of it.
Open Asset Import Library Assimp
- 5.4.3affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | assimp | all versions | — |
| Debian:14 | assimp | before 6.0.3+ds-1 | 6.0.3+ds-1 |
| PyPI | pyassimp | up to and including 5.4.3 | — |
Same product
assimp: all recordsOther highest-scoring records for the same primary product.
- CVE-2022-45748An issue was discovered with assimp 5.1.4, a use after free occurred in function ColladaParser::ExtractDataObjectFromChannel in file /code/A35Monitor
- CVE-2024-45679Heap-based buffer overflow vulnerability in Assimp versions prior to 5.4.3 allows a local attacker to execute arbitrary code by importing a 33Monitor
- CVE-2024-48423An issue in assimp v.5.4.3 allows a local attacker to execute arbitrary code via the CallbackToLogRedirector function within the Assimp libr31Monitor
- CVE-2024-40724Heap-based buffer overflow vulnerability in Assimp versions prior to 5.4.2 allows a local attacker to execute arbitrary code by inputting a 31Monitor
- CVE-2022-38528Open Asset Import Library (assimp) commit 3c253ca was discovered to contain a segmentation violation via the component Assimp::XFileImporter26Monitor
- CVE-2024-53425A heap-buffer-overflow vulnerability was discovered in the SkipSpacesAndLineEnd function in Assimp v5.4.3.24Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:assimp | 6.0.3+ds-1 · Debian:14 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2025-301556 days apartOpen Asset Import Library Assimp ASE File ASELoader.cpp BuildUniqueRepresentation out-of-bounds21Monitor
- CVE-2025-275262 days apartOpen Asset Import Library Assimp CSM File fast_atof.h fast_atoreal_move out-of-bounds21Monitor
- CVE-2025-275362 days apartOpen Asset Import Library Assimp LWS File LWSLoader.cpp MergeScenes out-of-bounds21Monitor
- CVE-2025-275462 days apartOpen Asset Import Library Assimp AC3D File ACLoader.cpp ConvertObjectSection heap-based overflow21Monitor
- CVE-2025-275562 days apartOpen Asset Import Library Assimp AC3D File ACLoader.cpp ConvertObjectSection out-of-bounds21Monitor
- CVE-2025-275762 days apartOpen Asset Import Library Assimp MD5 File MD5Parser.cpp AI_MD5_PARSE_STRING_IN_QUOTATION heap-based overflow21Monitor
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- Integrity
- Availability
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- X
Weakness class (CWE)
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory BufferCVSS vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Overflow BuffersCAPEC-100likelihood: High · Very High
- Buffer ManipulationCAPEC-123likelihood: High · Very High
- Client-side Injection-induced Buffer OverflowCAPEC-14likelihood: Medium · High
- Filter Failure through Buffer OverflowCAPEC-24likelihood: High · High
- MIME ConversionCAPEC-42likelihood: High · High
- Overflow Binary Resource FileCAPEC-44likelihood: High · Very High
- Buffer Overflow via Symbolic LinksCAPEC-45likelihood: High · High
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- github.com/assimp/assimp/issues/6128
- vuldb.com/?ctiid.310254
- vuldb.com/?id.310254
- vuldb.com/?submit.578001
Vendor advisories and official records. Exploit/PoC links are deliberately left out.