Medium severity6.8NVD Advisory· Published Mar 21, 2019· Updated Jun 17, 2026
CVE-2018-20340
CVE-2018-20340
Description
Yubico libu2f-host 1.1.6 contains unchecked buffers in devs.c, which could enable a malicious token to exploit a buffer overflow. An attacker could use this to attempt to execute malicious code using a crafted USB device masquerading as a security token on a computer where the affected library is currently in use. It is not possible to perform this attack with a genuine YubiKey.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
17= 1.1.6+ 2 more
- (no CPE)range: = 1.1.6
- cpe:2.3:a:yubico:libu2f-host:1.1.6:*:*:*:*:*:*:*
- (no CPE)range: <=1.1.6
- osv-coords13 versionspkg:rpm/opensuse/libu2f-host&distro=openSUSE%20Leap%2015.0pkg:rpm/opensuse/libu2f-host&distro=openSUSE%20Leap%2015.1pkg:rpm/opensuse/libu2f-host&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/libu2f-host&distro=openSUSE%20Leap%2015.3pkg:rpm/suse/libu2f-host&distro=SUSE%20Linux%20Enterprise%20Desktop%2012%20SP4pkg:rpm/suse/libu2f-host&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015pkg:rpm/suse/libu2f-host&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP2pkg:rpm/suse/libu2f-host&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/libu2f-host&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4pkg:rpm/suse/libu2f-host&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4pkg:rpm/suse/pam_u2f&distro=SUSE%20Linux%20Enterprise%20Desktop%2012%20SP4pkg:rpm/suse/pam_u2f&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4pkg:rpm/suse/pam_u2f&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4
< 1.1.6-lp151.2.3.1+ 12 more
- (no CPE)range: < 1.1.6-lp151.2.3.1
- (no CPE)range: < 1.1.6-lp151.2.3.1
- (no CPE)range: < 1.1.10-lp152.4.3.1
- (no CPE)range: < 1.1.10-3.9.1
- (no CPE)range: < 1.1.6-3.5.1
- (no CPE)range: < 1.1.6-3.3.3
- (no CPE)range: < 1.1.10-3.9.1
- (no CPE)range: < 1.1.10-3.9.1
- (no CPE)range: < 1.1.6-3.5.1
- (no CPE)range: < 1.1.6-3.5.1
- (no CPE)range: < 1.0.8-3.3.1
- (no CPE)range: < 1.0.8-3.3.1
- (no CPE)range: < 1.0.8-3.3.1
Patches
Vulnerability mechanics
References
6- www.yubico.com/support/security-advisories/ysa-2019-01/nvdPatchVendor Advisory
- developers.yubico.com/libu2f-host/Release_Notes.htmlnvdRelease NotesVendor Advisory
- seclists.org/bugtraq/2019/Feb/23nvdMailing ListThird Party Advisory
- www.debian.org/security/2019/dsa-4389nvdThird Party Advisory
- blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/nvd
- security.gentoo.org/glsa/202004-15nvd
News mentions
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