Back
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. An…
Medium6.8EPSS 0.50%
- Published
- Updated
- Reserved
- Assigned by
- mitre
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | Medium6.8 | CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.50% · top 57% of all CVEs (4 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.8.
Weakness
Affected products
n/a
- affected n/a
References (6)
- https://seclists.org/bugtraq/2019/Feb/23 (opens in a new tab)x_refsource_MISCx_transferred
- https://www.debian.org/security/2019/dsa-4389 (opens in a new tab)x_refsource_MISCx_transferred
- https://www.yubico.com/support/security-advisories/ysa-2019-01/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://developers.yubico.com/libu2f-host/Release_Notes.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/ (opens in a new tab)x_refsource_MISCx_transferred
- GLSA-202004-15 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2018-20340)Record last updated .