CVE-2025-2756Public exploitNetwork attack vector

Application crash via AC3D vertex buffer overwrite

Published Mar 25, 2025 · Updated Mar 31, 2025

Heap-based buffer overflow in Assimp 5.4.3 allows attackers to crash an importing application via a malformed AC3D file. ConvertObjectSection allocates mesh vertex storage from mNumVertices, then writes through the buffer for unchecked surface entry counts. The flaw is reached when an application processes attacker-supplied AC3D content; the public proof of concept demonstrates a heap overwrite and process crash.

CVSS severity5.3
Medium
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in Assimp 5.4.3 allows attackers to crash an importing application via a malformed AC3D file. ConvertObjectSection allocates mesh vertex storage from mNumVertices, then writes through the buffer for unchecked surface entry counts. The flaw is reached when an application processes attacker-supplied AC3D content; the public proof of concept demonstrates a heap overwrite and process crash.

The record

CVE
CVE-2025-2756
Published
Mar 25, 2025
Updated
Mar 31, 2025
Vendor
Open Asset Import Library
Product
Assimp
Classifications
CWE-119, CWE-122, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 25, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 31, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Open Asset Import Library · Assimpversion=5.4.3

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
5.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-122Heap-based Buffer Overflow
T1203Exploitation for Client Execution

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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