CVE-2020-5395
fontforge: out-of-bounds write in SFD_GetFontMetaData function in sfd.c
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · January 3, 2020
Updated · June 28, 2026
Description
An out-of-bounds write was discovered in fontforge while parsing SFD files containing very large LayerCount tokens. The flaw allows an attacker to overwrite data before a buffer allocated on the heap, thus causing the application to crash or execute arbitrary code.
Statement
Impact of the flaw set to Moderate since upstream does not consider a network-facing application that accepts untrusted font files as a reasonable use of fontforge tool/library, making the impact of a possible exploitation of this flaw smaller.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer