Out-of-bounds Read Affecting libxfont package, versions <1:2.0.1-4
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published14 Jul 2026
- disclosed11 Oct 2017
Introduced: 11 Oct 2017
CVE-2017-13720 (opens in a new tab)How to fix?
Upgrade Echo:latest libxfont to version 1:2.0.1-4 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libxfont package and not the libxfont package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
In the PatternMatch function in fontfile/fontdir.c in libXfont through 1.5.2 and 2.x before 2.0.2, an attacker with access to an X connection can cause a buffer over-read during pattern matching of fonts, leading to information disclosure or a crash (denial of service). This occurs because '\0' characters are incorrectly skipped in situations involving ? characters.
References
- https://advisory.echohq.com/cve/CVE-2017-13720
- https://www.cve.org/CVERecord?id=CVE-2017-13720
- http://www.debian.org/security/2017/dsa-3995
- https://bugzilla.redhat.com/show_bug.cgi?id=1500690
- https://bugzilla.suse.com/show_bug.cgi?id=1054285
- https://cgit.freedesktop.org/xorg/lib/libXfont/commit/?id=d1e670a4a8704b8708e493ab6155589bcd570608
- https://security.gentoo.org/glsa/201711-08
- https://www.x.org/releases/individual/lib/libXfont2-2.0.2.tar.bz2