CVE-2025-23022

Availability loss via flex coordinate overflow

Published Jan 10, 2025 · Updated Feb 12, 2025

Integer overflow in FreeType 2.8.1 allows local users to cause limited availability loss through crafted CFF glyph flex data. The cf2_doFlex routine in cff/cf2intrp.c performs signed 32-bit additions and subtractions on CFF flex coordinates without overflow-safe macros. Reachability requires a local application to process a crafted CFF glyph with the affected library; downstream security teams describe the overflow as expected and harmless, so the concrete service effect is disputed.

CVSS severity4.0
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in FreeType 2.8.1 allows local users to cause limited availability loss through crafted CFF glyph flex data. The cf2_doFlex routine in cff/cf2intrp.c performs signed 32-bit additions and subtractions on CFF flex coordinates without overflow-safe macros. Reachability requires a local application to process a crafted CFF glyph with the affected library; downstream security teams describe the overflow as expected and harmless, so the concrete service effect is disputed.

The record

CVE
CVE-2025-23022
Published
Jan 10, 2025
Updated
Feb 12, 2025
Vendor
FreeType
Product
FreeType
Classifications
CWE-190
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 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?

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  1. Affected versionversion=2.8.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

FreeType · FreeTypeversion=2.8.1

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6.2NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0MITRECVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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