CVE-2025-15277
Unknown Unknown - Not Provided
Heap-Based Buffer Overflow in FontForge SGI Parsing Enables RCE

Publication date: 2025-12-31

Last updated on: 2025-12-31

Assigner: Zero Day Initiative

Description
FontForge GUtils SGI File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of FontForge. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of scanlines within SGI files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-27920.
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Meta Information
Published
2025-12-31
Last Modified
2025-12-31
Generated
2026-06-16
AI Q&A
2025-12-31
EPSS Evaluated
2026-06-15
NVD
CVE-2025-15277
EUVD
EUVD-2025-205889
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
fontforge fontforge *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
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Executive Summary

CVE-2025-15277 is a remote code execution vulnerability in FontForge's GUtils SGI file parsing component. It occurs because the software does not properly validate the length of user-supplied data when parsing scanlines in SGI files, leading to a heap-based buffer overflow. An attacker can exploit this by tricking a user into opening a malicious file or visiting a malicious webpage, allowing the attacker to execute arbitrary code with the same privileges as the current process. [1]

Impact Analysis

This vulnerability can allow an attacker to execute arbitrary code on your system with the privileges of the FontForge process. This could lead to unauthorized access, data theft, system compromise, or disruption of services depending on the privileges of the exploited process. [1]

Mitigation Strategies

To mitigate this vulnerability, avoid opening SGI files from untrusted sources or visiting malicious webpages that may contain crafted SGI files. Ensure that users are aware of the risk and do not interact with suspicious files or links. Additionally, apply any available patches or updates from FontForge once released to fix the heap-based buffer overflow in the SGI file parsing component. [1]

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