CVE-2025-15273Network attack vector

Code execution via unchecked PFB data copy

Published Dec 31, 2025 · Updated Dec 31, 2025

Stack-based buffer overflow in FontForge allows remote attackers to execute arbitrary code as the current user through a crafted PFB file. The PFB parser fails to validate the length of file-controlled data before copying it into a fixed-length stack buffer. Exploitation requires the target to visit a malicious page or open the file, and successful code runs with the target user’s privileges.

CVSS severity8.8
High
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in FontForge allows remote attackers to execute arbitrary code as the current user through a crafted PFB file. The PFB parser fails to validate the length of file-controlled data before copying it into a fixed-length stack buffer. Exploitation requires the target to visit a malicious page or open the file, and successful code runs with the target user’s privileges.

The record

CVE
CVE-2025-15273
Published
Dec 31, 2025
Updated
Dec 31, 2025
Vendor
FontForge
Product
FontForge
Classifications
CWE-121, T1204.002, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 31, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 31, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=aca4f524c6cb14cdc7bc4cd493492a33f5154797

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FontForge · FontForgeversion=aca4f524c6cb14cdc7bc4cd493492a33f5154797

Published CVSS scores

8.8Zero Day InitiativeCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8Amazon LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8UbuntuCVSS:3.0/AV:N/AC:L/PR:N/UI:R/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1204.002Malicious File
T1203Exploitation for Client Execution

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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