CVE-2021-21914Network attack vector

Code execution via undersized JPEG 2000 heap buffer

Published Apr 14, 2022 · Updated Apr 15, 2025

Heap-based buffer overflow in DecoderStream::Append in Accusoft ImageGear 19.10 allows attackers to execute code via a crafted JPEG 2000 file. The routine adds 0x1c to a file-controlled size without overflow checking, allocates the wrapped size, then copies the requested data into the undersized heap buffer. Exploitation requires an application built with the affected SDK to process attacker-supplied JPEG 2000 content and can corrupt a function-pointer-bearing heap object.

CVSS severity9.8
Critical
EPSS probability1.59%
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 DecoderStream::Append in Accusoft ImageGear 19.10 allows attackers to execute code via a crafted JPEG 2000 file. The routine adds 0x1c to a file-controlled size without overflow checking, allocates the wrapped size, then copies the requested data into the undersized heap buffer. Exploitation requires an application built with the affected SDK to process attacker-supplied JPEG 2000 content and can corrupt a function-pointer-bearing heap object.

The record

CVE
CVE-2021-21914
Published
Apr 14, 2022
Updated
Apr 15, 2025
Vendor
Accusoft
Product
ImageGear
Classifications
CWE-190, CWE-122, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 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=19.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Accusoft · ImageGearversion=19.10

Published CVSS scores

8.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST National Vulnerability DatabaseAV: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

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
CWE-122Heap-based Buffer Overflow
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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