CVE-2022-34033Network attack vector

Conversion-process crash via empty HTML title

Published Jul 18, 2022 · Updated Aug 3, 2024

Heap-based buffer overflow in HTMLDOC 1.9.15 allows remote attackers to crash the conversion process via crafted HTML input. The htmlGetText routine treated a nonnull, zero-length title as text and entered its concatenation path, causing out-of-bounds heap access before write_header emitted the title. Processing HTML containing an empty title can terminate the conversion job, and the published assessment limits the resulting impact to availability.

CVSS severity7.5
High
EPSS probability1.65%
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 HTMLDOC 1.9.15 allows remote attackers to crash the conversion process via crafted HTML input. The htmlGetText routine treated a nonnull, zero-length title as text and entered its concatenation path, causing out-of-bounds heap access before write_header emitted the title. Processing HTML containing an empty title can terminate the conversion job, and the published assessment limits the resulting impact to availability.

The record

CVE
CVE-2022-34033
Published
Jul 18, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 18, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 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
T1499.004Application or System Exploitation

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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