CVE-2023-43251Public exploit

Code execution via exception-handler-chain corruption

Published Oct 19, 2023 · Updated Sep 12, 2024

Memory corruption in XnSoft NConvert 7.136 allows attackers to crash the process or execute code by processing a crafted image file. The image-processing path performs an invalid byte write at nconvert+0x8625e, corrupting the Structured Exception Handler chain. Execution requires a victim or automated workflow to pass the malicious image to the Windows executable; the demonstrated result is an access-violation crash, while the published assessment classifies the corruption as exploitable.

CVSS severity7.8
High
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in XnSoft NConvert 7.136 allows attackers to crash the process or execute code by processing a crafted image file. The image-processing path performs an invalid byte write at nconvert+0x8625e, corrupting the Structured Exception Handler chain. Execution requires a victim or automated workflow to pass the malicious image to the Windows executable; the demonstrated result is an access-violation crash, while the published assessment classifies the corruption as exploitable.

The record

CVE
CVE-2023-43251
Published
Oct 19, 2023
Updated
Sep 12, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-755, T1203, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 12, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-755Improper Handling of Exceptional Conditions
T1203Exploitation for Client Execution
T1204.002User Execution: Malicious File

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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