Buffer overflow in Fontforge

CVE-2025-15273

FontForge PFB File Parsing Stack-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 PFB files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current user. Was ZDI-CAN-28546.

Vulnerability class: Buffer Overflow

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (47.3th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-15273: held from 0.006 to 0.006.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: -0.000

Affected products

  • Fontforge — versions 2025-11-17, aca4f524c6cb14cdc7bc4cd493492a33f5154797

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-15273?
CVE-2025-15273 is a high-severity vulnerability in Fontforge, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2025-12-31.
How severe is CVE-2025-15273?
High severity. CVSS v3 base score is 8.8 out of 10.