CVE-2018-20340

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

0.49% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 42.4% of scored records. A rank, not a probability.

NVD base score

6.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2019-03-17 20:06Z7 YR AGO

Last updated

2024-08-05 11:58Z2 YR AGO

Reserved

2018-12-21

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass

Data version

5.1

Document digest

15378c7171a08dce3d4aa34941400767bac34fe519972025fed1553e5c547a64

• seclists.orghttps://seclists.org/bugtraq/2019/Feb/23x_refsource_MISC
• www.debian.orghttps://www.debian.org/security/2019/dsa-4389x_refsource_MISC
• www.yubico.comhttps://www.yubico.com/support/security-advisories/ysa-2019-01/x_refsource_CONFIRM
• developers.yubico.comhttps://developers.yubico.com/libu2f-host/Release_Notes.htmlx_refsource_CONFIRM
• blog.inhq.nethttps://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/x_refsource_MISC
• security.gentoo.orgGLSA-202004-15https://security.gentoo.org/glsa/202004-15vendor-advisoryx_refsource_GENTOO