CVE-2022-40009Public exploit

Process crash via heap use-after-free

Published Sep 20, 2022 · Updated May 28, 2025

Use-after-free in SWFTools commit 772e55a allows attackers to crash ttftool by supplying crafted TrueType font data. The grow_unicode function in lib/ttf.c reallocates a heap buffer and then clears memory through the stale pre-reallocation pointer, producing a heap-use-after-free during cmap_parse. Attackers must cause ttftool to parse the crafted font; the observed consequence is process termination, while broader code execution is not demonstrated.

CVSS severity9.8
Critical
EPSS probability1.07%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in SWFTools commit 772e55a allows attackers to crash ttftool by supplying crafted TrueType font data. The grow_unicode function in lib/ttf.c reallocates a heap buffer and then clears memory through the stale pre-reallocation pointer, producing a heap-use-after-free during cmap_parse. Attackers must cause ttftool to parse the crafted font; the observed consequence is process termination, while broader code execution is not demonstrated.

The record

CVE
CVE-2022-40009
Published
Sep 20, 2022
Updated
May 28, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T1203
Attack vector
local
Privileges
unauthenticated

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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NVDCVSS: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.

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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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1203Exploitation for Client Execution

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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