Buffer overflow in Fontforge
CVE-2025-15277
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.
Vulnerability class: Buffer Overflow
EPSS: 0.003 (17.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Fontforge — versions 88de9b7dc76fbdef9069b7664ecc280f1c15ba2f, 20251009
Weakness classification (CWE)
References
- zdi-disclosures@trendmicro.com (x_research-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-15277?
- CVE-2025-15277 is a high-severity vulnerability in Fontforge, classified under Heap-based Buffer Overflow. CVSS score: 7.8/10. Published 2025-12-31.
- How severe is CVE-2025-15277?
- High severity. CVSS v3 base score is 7.8 out of 10.