CVE-2021-21784Network attack vector

Memory corruption via unchecked JPG channel size

Published Apr 13, 2021 · Updated Aug 3, 2024

Out-of-bounds write in Accusoft ImageGear 19.8 allows attackers to corrupt memory by supplying a malformed JPG file. The handle_color_channel_with_high_precision function writes beyond its buffer because JPG SOF channel data is processed without a required size check. Reachability requires an integrating application to load the attacker-supplied image, after which the hosting process's memory is corrupted.

CVSS severity9.8
Critical
EPSS probability0.81%
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 19.8 allows attackers to corrupt memory by supplying a malformed JPG file. The handle_color_channel_with_high_precision function writes beyond its buffer because JPG SOF channel data is processed without a required size check. Reachability requires an integrating application to load the attacker-supplied image, after which the hosting process's memory is corrupted.

The record

CVE
CVE-2021-21784
Published
Apr 13, 2021
Updated
Aug 3, 2024
Vendor
Accusoft
Product
ImageGear
Classifications
CWE-787, CWE-119, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Accusoft ImageGear 19.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Accusoft · ImageGearversion=Accusoft ImageGear 19.8

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
9.8Cisco TalosCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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