CVE-2021-21944Public exploitNetwork attack vector

Application crash via unchecked planar TIFF write

Published Apr 14, 2022 · Updated Apr 15, 2025

Heap-based buffer overflow in Accusoft ImageGear 19.10 allows attackers to crash a consuming application via a crafted TIFF file. The FUN_10074d50 planar TIFF path writes four destination bytes for every three source bytes while advancing a tag-controlled sample index without checking the allocated destination boundary. A host application must load a TIFF with the requisite 12-bit planar tags; the demonstrated consequence is an access violation, with no code execution reported for this advisory.

CVSS severity9.8
Critical
EPSS probability1.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Heap-based buffer overflow in Accusoft ImageGear 19.10 allows attackers to crash a consuming application via a crafted TIFF file. The FUN_10074d50 planar TIFF path writes four destination bytes for every three source bytes while advancing a tag-controlled sample index without checking the allocated destination boundary. A host application must load a TIFF with the requisite 12-bit planar tags; the demonstrated consequence is an access violation, with no code execution reported for this advisory.

The record

CVE
CVE-2021-21944
Published
Apr 14, 2022
Updated
Apr 15, 2025
Vendor
Accusoft
Product
ImageGear
Classifications
CWE-787, CWE-122, T1204.002
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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

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
8.8NIST NVDCVSS:3.1/AV:N/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 exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-122Heap-based Buffer Overflow
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo