FontForge SFD File Parsing Improper Validation of Array Index Remote Code Execution Vulnerability
Description
FontForge SFD File Parsing Improper Validation of Array Index Remote Code Execution Vulnerability
AI Analyst Comment
Remediation
Apply security patches immediately for internet-facing systems. Monitor for exploitation attempts and review access logs.
Executive Summary:
A high-severity vulnerability has been identified in FontForge software, which could allow a remote attacker to execute arbitrary code on a user's system. This is achieved when a user is tricked into opening a specially crafted SFD font file, potentially leading to a complete system compromise, data theft, or installation of malware.
Vulnerability Details
CVE-ID: CVE-2025-15271
Affected Software: FontForge Multiple Products
Affected Versions: See vendor advisory for specific affected versions
Vulnerability: This vulnerability is an out-of-bounds write caused by improper validation of an array index when the FontForge software parses a Spline Font Database (SFD) file. An attacker can create a malicious SFD file with crafted values that cause the application to write data outside the intended memory buffer. By carefully controlling the data written and its location, an attacker can overwrite critical program structures, such as function pointers, to hijack the application's control flow and execute arbitrary code in the context of the user running FontForge.
Business Impact
This vulnerability presents a significant risk to the organization, classified as High severity with a CVSS score of 8.8. Successful exploitation could lead to a complete compromise of the affected workstation or server. Potential consequences include the theft of sensitive data and intellectual property (such as proprietary font designs), installation of ransomware or spyware, and using the compromised system as a pivot point to attack other internal network resources. This could result in financial loss, operational disruption, and reputational damage.
Remediation Plan
Immediate Action:
Proactive Monitoring:
cmd.exe,powershell.exe).Compensating Controls:
Exploitation Status
Public Exploit Available: false
Analyst Notes:
As of December 31, 2025, there are no known public exploits or active exploitation campaigns targeting this vulnerability. However, given the high CVSS score and the direct path to remote code execution, it is highly probable that threat actors will develop a functional exploit. The attack vector requires user interaction, making it a likely candidate for inclusion in targeted phishing campaigns.
Analyst Recommendation
Due to the high severity (CVSS 8.8) of this vulnerability and its potential for complete system compromise, it is imperative that the organization acts immediately. The primary recommendation is to apply the vendor-supplied patches to all affected systems without delay. Although this CVE is not currently listed on the CISA KEV list, its critical nature warrants an urgent response to prevent potential future exploitation and protect sensitive organizational assets.