What is CVE-2019-5519?

CVE-2019-5519 is a medium-severity vulnerability in VMware Esxi, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 6.8/10. Published 2019-04-01.

How severe is CVE-2019-5519?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Is CVE-2019-5519 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in VMware Esxi

CVE-2019-5519

VMware ESXi (6.7 before ESXi670-201903001, 6.5 before ESXi650-201903001, 6.0 before ESXi600-201903001), Workstation (15.x before 15.0.4, 14.x before 14.1.7), Fusion (11.x before 11.0.3, 10.x before 10.1.6) contain a Time-of-check Time-of-use (TOCTOU) vulnerability in the virtual USB 1.1 UHCI (Universal Host Controller Interface). Exploitation of this issue requires an attacker to have access to a virtual machine with a virtual USB controller present. This issue may allow a guest to execute code on the host.

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

Published 2019-04-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.010 (61.6th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

VMware Esxi — versions 6.0, 6.5, 6.7
VMware Fusion
VMware Esxi, Workstation, Fusion — versions ESXi 6.7 before ESXi670-201903001, ESXi 6.5 before ESXi650-201903001, ESXi 6.0 before ESXi600-201903001
VMware Workstation

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

www.securityfocus.com/bid/107535 (vdb-entry)
packetstormsecurity.com/files/152290/VMware-Security-Advisory-2019-0005.html (VDB Entry, Third Party Advisory)
www.vmware.com/security/advisories/VMSA-2019-0005.html (Vendor Advisory)
www.zerodayinitiative.com/advisories/ZDI-19-420/
www.securityfocus.com/bid/108443 (vdb-entry)

Frequently asked questions

What is CVE-2019-5519?: CVE-2019-5519 is a medium-severity vulnerability in VMware Esxi, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 6.8/10. Published 2019-04-01.
How severe is CVE-2019-5519?: Medium severity. CVSS v3 base score is 6.8 out of 10.
Is CVE-2019-5519 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.