CVE-2019-9578

In devs.c in Yubico libu2f-host before 1.1.8, the response to init is misparsed, leaking uninitialized stack memory back to the device.

Published: 2019-03-05 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-9578 is rated Moderate Risk (59.2/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.30%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-9578

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.44% 2.30% +0.85%
2 2026-02-03 1.53% 1.44% -0.09%
3 2025-03-30 — 1.53% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-9578

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2019-9578

OS Trackers for CVE-2019-9578

vendor priority summary link
debian low CVE-2019-9578 low priority: Debian including 1 source packages (libu2f-host), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2019-9578
gentoo high CVE-2019-9578: 1 GLSA(s) (202004-15), 1 atom(s) (app-crypt/libu2f-host); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2019-9578
suse low CVE-2019-9578 severity low: SUSE including 26 source package names (libu2f-host-devel-1.1.10-150600.16.3, libu2f-host-devel-1.1.10-3.9.1, …), 57 product×package rows across 22 product lines (SUSE Linux Enterprise Desktop 12 SP4, SUSE Linux Enterprise High Performance Computing 12 SP5, … (22 product lines)): Fixed 57. https://www.suse.com/security/cve/CVE-2019-9578/
ubuntu low CVE-2019-9578 low priority: Ubuntu including 1 source packages (libu2f-host), 19 status rows across 19 suites (bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 13, needed 2, DNE 1, ignored 1, needs-triage 1, released 1. https://ubuntu.com/security/CVE-2019-9578

Affected software / configurations for CVE-2019-9578

Vendor Product Version Raw CPE
yubico libu2f-host < 1.1.8 cpe:2.3:a:yubico:libu2f-host:*:*:*:*:*:*:*:*

References for CVE-2019-9578

cvelogic Threat Intelligence