CVE-2022-24191Public exploit

Application crash via unbounded GIF LZW loop

Published Apr 4, 2022 · Updated Aug 3, 2024

Heap buffer overflow in HTMLDOC 1.9.14 allows attackers to crash the application when it processes a crafted GIF image. In gif_read_lzw, a cyclic code-table chain leaves code at or above clear_code while each iteration increments sp and copies a table entry beyond its heap buffer. A user or calling application must make HTMLDOC parse the malicious image; the demonstrated consequence is a crash rather than disclosed code execution.

CVSS severity5.5
Medium
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in HTMLDOC 1.9.14 allows attackers to crash the application when it processes a crafted GIF image. In gif_read_lzw, a cyclic code-table chain leaves code at or above clear_code while each iteration increments sp and copies a table entry beyond its heap buffer. A user or calling application must make HTMLDOC parse the malicious image; the demonstrated consequence is a crash rather than disclosed code execution.

The record

CVE
CVE-2022-24191
Published
Apr 4, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-835, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 4, 2022CVE 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?

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

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.004Application or System Exploitation

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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