CVE-2025-15270Network attack vector

Code execution via SFD array overrun

Published Dec 31, 2025 · Updated Dec 31, 2025

Improper array-index validation in FontForge allows remote attackers to execute code through a crafted SFD file. The SFD parser uses file-supplied array indexes without adequate bounds validation, permitting a write beyond an allocated array. Opening the file or visiting a page that supplies it is required, and successful exploitation runs code with the current 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

Improper array-index validation in FontForge allows remote attackers to execute code through a crafted SFD file. The SFD parser uses file-supplied array indexes without adequate bounds validation, permitting a write beyond an allocated array. Opening the file or visiting a page that supplies it is required, and successful exploitation runs code with the current user's privileges.

The record

CVE
CVE-2025-15270
Published
Dec 31, 2025
Updated
Dec 31, 2025
Vendor
FontForge
Product
FontForge
Classifications
CWE-129, 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

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-129Improper Validation of Array Index
T1204.002User Execution: Malicious 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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