CVE-2020-14364

An out-of-bounds read/write access flaw was found in the USB emulator of the QEMU in versions before 5.2.0. This issue occurs while processing USB packets from a guest when USBDevice 'setup_len' exceeds its 'data_buf[4096]' in the do_token_in, do_token_out routines. This flaw allows a guest user to crash the QEMU process, resulting in a denial of service, or the potential execution of arbitrary code with the privileges of the QEMU process on the host.

Published: 2020-08-31 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-14364 is rated Moderate Risk (47.1/100): CVSS Medium severity, with high exploitation likelihood (EPSS 5.45%, 92th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize 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-2020-14364

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 11.44% 5.45% -5.99%
2 2026-06-06 12.95% 11.44% -1.51%
3 2026-06-01 — 12.95% —

Full EPSS history (41 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-14364

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 3.1 MEDIUM
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 0.8 3.7 [email protected]
4.4 2.0 MEDIUM
AV:L/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 3.4 6.4 [email protected]

Weakness enumeration for CVE-2020-14364

OS Trackers for CVE-2020-14364

vendor priority summary link
alpine medium CVE-2020-14364: 2 source package rows (qemu, xen); 24 state rows across 17 repos (3.10-main, 3.11-main, 3.12-main, 3.17-community, 3.17-main, 3.18-community, 3.18-main, 3.19-community, 3.19-main, 3.20-community, 3.20-main, 3.21-community, 3.21-main, 3.22-community, 3.22-main, edge-community, edge-main); fixed 17, open 7. https://security.alpinelinux.org/vuln/CVE-2020-14364
debian not yet assigned CVE-2020-14364 not yet assigned priority: Debian including 1 source packages (qemu), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2020-14364
gentoo normal CVE-2020-14364: 2 GLSA(s) (202009-14, 202011-09), 3 atom(s) (app-emulation/qemu, app-emulation/xen, app-emulation/xen-tools); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-14364
redhat high — https://access.redhat.com/security/cve/CVE-2020-14364
suse medium CVE-2020-14364 severity moderate: SUSE including 1038 source package names (0.38.1.5.8.45:qemu-tools-4.2.1-11.10.1, 0.38.1:qemu-4.2.1-11.10.1, …), 1671 product×package rows across 100 product lines (Container suse/sle-micro-rancher/5.2, Container suse/sles/15.2/virt-handler, … (100 product lines)): Fixed 1346, Known Affected 225, Known Not Affected 100. https://www.suse.com/security/cve/CVE-2020-14364/
ubuntu medium CVE-2020-14364 medium priority: Ubuntu including 2 source packages (qemu, qemu-kvm), 14 status rows across 7 suites (bionic, focal, groovy, hirsute, trusty, upstream, xenial): DNE 6, released 6, needs-triage 2. https://ubuntu.com/security/CVE-2020-14364

Affected software / configurations for CVE-2020-14364

Vendor Product Version Raw CPE
qemu qemu < 5.2.0 cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*
redhat openstack 10 cpe:2.3:a:redhat:openstack:10:*:*:*:*:*:*:*
redhat openstack 13 cpe:2.3:a:redhat:openstack:13:*:*:*:*:*:*:*
redhat enterprise_linux 6.0 cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
redhat enterprise_linux 7.0 cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
redhat enterprise_linux 8.0 cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:*
redhat enterprise_linux 8.0 cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:*
fedoraproject fedora 31 cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
fedoraproject fedora 32 cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
opensuse leap 15.2 cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
canonical ubuntu_linux 18.04 cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 20.04 cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*

References for CVE-2020-14364

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00024.html Broken Link Mailing List Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1869201 Issue Tracking Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/09/msg00013.html Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JTZQUQ6ZBPMFMNAUQBVJFELYNMUZLL6P/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M52WIRMZL6TZRYZ65N6OAYNNFHV62O2N/
https://security.gentoo.org/glsa/202009-14 Third Party Advisory
https://security.gentoo.org/glsa/202011-09 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200924-0006/ Third Party Advisory
https://usn.ubuntu.com/4511-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4760 Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/08/24/2 Mailing List Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/08/24/3 Mailing List Third Party Advisory
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