CVE-2023-40163Public exploitNetwork attack vector

Memory corruption via undersized lossless JPEG buffer

Published Sep 25, 2023 · Updated Nov 4, 2025

Out-of-bounds write in Accusoft ImageGear 20.1 allows remote attackers to corrupt memory by supplying a malformed lossless JPEG file. In allocate_buffer_for_jpeg_decoding, an SOF3 frame with a zero x_image value produces a one-byte heap allocation that is later written through an int16_t pointer. The host application must pass the crafted file to ImageGear's JPEG loader; the demonstrated consequence is heap corruption and process termination.

CVSS severity9.8
Critical
EPSS probability0.97%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Accusoft ImageGear 20.1 allows remote attackers to corrupt memory by supplying a malformed lossless JPEG file. In allocate_buffer_for_jpeg_decoding, an SOF3 frame with a zero x_image value produces a one-byte heap allocation that is later written through an int16_t pointer. The host application must pass the crafted file to ImageGear's JPEG loader; the demonstrated consequence is heap corruption and process termination.

The record

CVE
CVE-2023-40163
Published
Sep 25, 2023
Updated
Nov 4, 2025
Vendor
Accusoft
Product
ImageGear
Classifications
CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 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=20.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Accusoft · ImageGearversion=20.1

Published CVSS scores

9.8Cisco TalosCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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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