FontForge SFD File Parser array index

Summaryinfo

A vulnerability was found in FontForge. It has been rated as critical. Affected by this vulnerability is an unknown functionality of the component SFD File Parser. The manipulation leads to array index. This vulnerability is listed as CVE-2025-15270. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in FontForge (version unknown). It has been rated as critical. This issue affects an unknown function of the component SFD File Parser. The manipulation with an unknown input leads to a array index vulnerability. Using CWE to declare the problem leads to CWE-129. The product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

FontForge SFD File Parsing Improper Validation of Array Index 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 SFD files. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated array. An attacker can leverage this vulnerability to execute code in the context of the current user. Was ZDI-CAN-28563.

It is possible to read the advisory at zerodayinitiative.com. The identification of this vulnerability is CVE-2025-15270. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/01/2026).

The vulnerability scanner Nessus provides a plugin with the ID 281470 (Linux Distros Unpatched Vulnerability : CVE-2025-15270), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (281470) and EUVD (EUVD-2025-205897). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• FontForge

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion