CVE-2022-40008Public exploit

ttftool crash via unchecked TTF table read

Published Sep 20, 2022 · Updated May 28, 2025

Heap-buffer over-read in SWFTools commit 772e55a allows local users to crash ttftool by opening a crafted TrueType font. The OS/2 table parser passes fields from an undersized font table to readU8, which reads one byte beyond the allocated heap buffer without checking the table boundary. Exploitation requires ttftool to process the crafted local file; the demonstrated consequence is a process abort, with no demonstrated code execution or data modification.

CVSS severity9.8
Critical
EPSS probability1.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-buffer over-read in SWFTools commit 772e55a allows local users to crash ttftool by opening a crafted TrueType font. The OS/2 table parser passes fields from an undersized font table to readU8, which reads one byte beyond the allocated heap buffer without checking the table boundary. Exploitation requires ttftool to process the crafted local file; the demonstrated consequence is a process abort, with no demonstrated code execution or data modification.

The record

CVE
CVE-2022-40008
Published
Sep 20, 2022
Updated
May 28, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1204.002
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 20, 2022CVE publishedPublication date reported by the CVE source.
  2. May 28, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/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.

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)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1204.002Malicious File

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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