CVE-2018-20340
Yubico libu2f-host 1.1.6 contains unchecked buffers in devs.c, which could enable a malicious token to exploit a buffer overflow.
Does this matter?
Lower severity and a low EPSS score (0.50%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.0
- 6.8 MEDIUMCVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.50% probability · 43th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- yubico/libu2f-host · debian/debian linux
- Source
- cve@mitre.org
EPSS 0.5% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/
- https://developers.yubico.com/libu2f-host/Release_Notes.htmlRelease Notes, Vendor Advisory
- https://seclists.org/bugtraq/2019/Feb/23Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202004-15
- https://www.debian.org/security/2019/dsa-4389Third Party Advisory
- https://www.yubico.com/support/security-advisories/ysa-2019-01/Patch, Vendor Advisory
- https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/
- https://developers.yubico.com/libu2f-host/Release_Notes.htmlRelease Notes, Vendor Advisory
- https://seclists.org/bugtraq/2019/Feb/23Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202004-15
- https://www.debian.org/security/2019/dsa-4389Third Party Advisory
- https://www.yubico.com/support/security-advisories/ysa-2019-01/Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.