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NVD / CVE Program· CNA redhat

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.

MediumCVSS 5.0 · v3.1—Proof of concept Fix available

Noroxi assessment

Priority: Monitor (action score 22/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 5.4% (FIRST EPSS); higher than 92.7% of all records.
  • Someone with local access to the system can trigger it. Administrator privileges are required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: libiscsi (AlmaLinux:8) 1.18.0-8.module_el8.3.0+2048+e7a0a3ea, 1.18.0-8.module_el8.5.0+2608+72063365, 1.18.0-8.module_el8.6.0+2880+7d9e3703; libiscsi-devel (AlmaLinux:8) 1.18.0-8.module_el8.6.0+2880+7d9e3703, 1.18.0-8.module_el8.3.0+2048+e7a0a3ea, 1.18.0-8.module_el8.5.0+2608+72063365; libiscsi-utils (AlmaLinux:8) 1.18.0-8.module_el8.3.0+2048+e7a0a3ea, 1.18.0-8.module_el8.6.0+2880+7d9e3703, 1.18.0-8.module_el8.5.0+2608+72063365.
  • Mentioned 5 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to libiscsi (AlmaLinux:8) 1.18.0-8.module_el8.3.0+2048+e7a0a3ea, 1.18.0-8.module_el8.5.0+2608+72063365, 1.18.0-8.module_el8.6.0+2880+7d9e3703; libiscsi-devel (AlmaLinux:8) 1.18.0-8.module_el8.6.0+2880+7d9e3703, 1.18.0-8.module_el8.3.0+2048+e7a0a3ea, 1.18.0-8.module_el8.5.0+2608+72063365; libiscsi-utils (AlmaLinux:8) 1.18.0-8.module_el8.3.0+2048+e7a0a3ea, 1.18.0-8.module_el8.6.0+2880+7d9e3703, 1.18.0-8.module_el8.5.0+2608+72063365 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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
Aug 31, 2020
Updated
Jun 16, 2026
EPSS
5.4% · 92th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
20 / 40 · 5.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
2 / 30 · 5.4%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
qemuqemu
redhatopenstack
redhatenterprise linux
fedoraprojectfedora
debiandebian linux
opensuseleap
canonicalubuntu linux

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a QEMU

    • QEMU versions before 5.2.0affected
Affected versions · NVD (14)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • canonical ubuntu linux16.04
  • canonical ubuntu linux18.04
  • canonical ubuntu linux20.04
  • debian debian linux10.0
  • debian debian linux9.0
  • fedoraproject fedora31
  • fedoraproject fedora32
  • opensuse leap15.2
  • qemu qemubefore 5.2.0
  • redhat enterprise linux6.0
  • redhat enterprise linux7.0
  • redhat enterprise linux8.0
  • redhat openstack10
  • redhat openstack13

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8libiscsibefore 1.18.0-8.module_el8.3.0+2048+e7a0a3ea1.18.0-8.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8libiscsibefore 1.18.0-8.module_el8.5.0+2608+720633651.18.0-8.module_el8.5.0+2608+72063365
AlmaLinux:8libiscsibefore 1.18.0-8.module_el8.6.0+2880+7d9e37031.18.0-8.module_el8.6.0+2880+7d9e3703
AlmaLinux:8libiscsi-develbefore 1.18.0-8.module_el8.6.0+2880+7d9e37031.18.0-8.module_el8.6.0+2880+7d9e3703
AlmaLinux:8libiscsi-develbefore 1.18.0-8.module_el8.3.0+2048+e7a0a3ea1.18.0-8.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8libiscsi-develbefore 1.18.0-8.module_el8.5.0+2608+720633651.18.0-8.module_el8.5.0+2608+72063365
AlmaLinux:8libiscsi-utilsbefore 1.18.0-8.module_el8.3.0+2048+e7a0a3ea1.18.0-8.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8libiscsi-utilsbefore 1.18.0-8.module_el8.6.0+2880+7d9e37031.18.0-8.module_el8.6.0+2880+7d9e3703
AlmaLinux:8libiscsi-utilsbefore 1.18.0-8.module_el8.5.0+2608+720633651.18.0-8.module_el8.5.0+2608+72063365
AlmaLinux:8netcfbefore 0.2.8-12.module_el8.5.0+2608+720633650.2.8-12.module_el8.5.0+2608+72063365
AlmaLinux:8netcfbefore 0.2.8-12.module_el8.3.0+2048+e7a0a3ea0.2.8-12.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8netcfbefore 0.2.8-12.module_el8.6.0+2880+7d9e37030.2.8-12.module_el8.6.0+2880+7d9e3703
AlmaLinux:8netcf-develbefore 0.2.8-12.module_el8.5.0+2608+720633650.2.8-12.module_el8.5.0+2608+72063365
AlmaLinux:8netcf-develbefore 0.2.8-12.module_el8.3.0+2048+e7a0a3ea0.2.8-12.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8netcf-develbefore 0.2.8-12.module_el8.6.0+2880+7d9e37030.2.8-12.module_el8.6.0+2880+7d9e3703
AlmaLinux:8netcf-libsbefore 0.2.8-12.module_el8.3.0+2048+e7a0a3ea0.2.8-12.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8netcf-libsbefore 0.2.8-12.module_el8.5.0+2608+720633650.2.8-12.module_el8.5.0+2608+72063365
AlmaLinux:8netcf-libsbefore 0.2.8-12.module_el8.6.0+2880+7d9e37030.2.8-12.module_el8.6.0+2880+7d9e3703
AlmaLinux:8sgabiosbefore 1:0.20170427git-3.module_el8.5.0+2608+720633651:0.20170427git-3.module_el8.5.0+2608+72063365
AlmaLinux:8sgabiosbefore 1:0.20170427git-3.module_el8.3.0+2048+e7a0a3ea1:0.20170427git-3.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8sgabios-binbefore 1:0.20170427git-3.module_el8.6.0+2880+7d9e37031:0.20170427git-3.module_el8.6.0+2880+7d9e3703
AlmaLinux:8sgabios-binbefore 1:0.20170427git-3.module_el8.5.0+2608+720633651:0.20170427git-3.module_el8.5.0+2608+72063365
Alpine:v3.10xenbefore 4.12.3-r34.12.3-r3
Alpine:v3.11xenbefore 4.13.1-r34.13.1-r3

+96

Same product

qemu: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-12928The QMP migrate command in QEMU version 4.0.0 and earlier is vulnerable to OS command injection, which allows the remote attacker to…
    60This week
  • CVE-2015-8556Local privilege escalation vulnerability in the Gentoo QEMU package before 2.5.0-r1.
    44Plan
  • CVE-2017-15118A stack-based buffer overflow vulnerability was found in NBD server implementation in qemu before 2.11 allowing a client to request an…
    43Plan

Published before and after this one in the same product

  • ← EarlierCVE-2020-14415Aug 27, 2020 · oss_write in audio/ossaudio.c in QEMU before 5.0.0 mishandles a buffer position.
    13Monitor
  • ← EarlierCVE-2020-12829Aug 31, 2020 · In QEMU through 5.0.0, an integer overflow was found in the SM501 display driver implementation.
    15Monitor
  • Later →CVE-2020-25084Sep 25, 2020 · QEMU 5.0.0 has a use-after-free in hw/usb/hcd-xhci.c because the usb_packet_map return value is not checked.
    12Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:libiscsi1.18.0-8.module_el8.6.0+2880+7d9e3703 · AlmaLinux:8Package registry (OSV)
almalinux:libiscsi-devel1.18.0-8.module_el8.6.0+2880+7d9e3703 · AlmaLinux:8Package registry (OSV)
almalinux:libiscsi-utils1.18.0-8.module_el8.3.0+2048+e7a0a3ea · AlmaLinux:8Package registry (OSV)
almalinux:netcf0.2.8-12.module_el8.5.0+2608+72063365 · AlmaLinux:8Package registry (OSV)
almalinux:netcf-devel0.2.8-12.module_el8.3.0+2048+e7a0a3ea · AlmaLinux:8Package registry (OSV)
almalinux:netcf-libs0.2.8-12.module_el8.6.0+2880+7d9e3703 · AlmaLinux:8Package registry (OSV)
almalinux:sgabios1:0.20170427git-3.module_el8.5.0+2608+72063365 · AlmaLinux:8Package registry (OSV)
almalinux:sgabios-bin1:0.20170427git-3.module_el8.5.0+2608+72063365 · AlmaLinux:8Package registry (OSV)
alpine:qemu5.0.0-r2 · Alpine:v3.12Package registry (OSV)
alpine:xen4.12.3-r3 · Alpine:v3.10Package registry (OSV)
debian:qemu1:5.1+dfsg-4 · Debian:12Package registry (OSV)
opensuse:qemu4.2.1-lp152.9.6.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:qemu-linux-user4.2.1-lp152.9.6.1 · openSUSE:Leap 15.2Package registry (OSV)
opensuse:qemu-testsuite4.2.1-lp152.9.6.1 · openSUSE:Leap 15.2Package registry (OSV)
red hat:libcacard10:1.5.3-105.el7_2.20 · Red Hat:rhel_aus:7.2::serverPackage registry (OSV)
red hat:libcacard-devel10:1.5.3-105.el7_2.20 · Red Hat:rhel_aus:7.2::serverPackage registry (OSV)
red hat:qemu-img10:1.5.3-105.el7_2.20 · Red Hat:rhel_aus:7.2::serverPackage registry (OSV)
red hat:qemu-img-ma10:2.12.0-33.el7_7.4 · Red Hat:rhel_eus:7.7::serverPackage registry (OSV)
red hat:qemu-kvm10:1.5.3-105.el7_2.20 · Red Hat:rhel_aus:7.2::serverPackage registry (OSV)
red hat:qemu-kvm-common10:1.5.3-105.el7_2.20 · Red Hat:rhel_aus:7.2::serverPackage registry (OSV)
red hat:qemu-kvm-common-ma10:2.12.0-33.el7_7.4 · Red Hat:rhel_eus:7.7::serverPackage registry (OSV)
red hat:qemu-kvm-debuginfo10:1.5.3-105.el7_2.20 · Red Hat:rhel_aus:7.2::serverPackage registry (OSV)
red hat:qemu-kvm-ma10:2.12.0-33.el7_7.4 · Red Hat:rhel_eus:7.7::serverPackage registry (OSV)
red hat:qemu-kvm-ma-debuginfo10:2.12.0-33.el7_7.4 · Red Hat:rhel_eus:7.7::serverPackage registry (OSV)
red hat:qemu-kvm-tools10:1.5.3-105.el7_2.20 · Red Hat:rhel_aus:7.2::serverPackage registry (OSV)
red hat:qemu-kvm-tools-ma10:2.12.0-33.el7_7.4 · Red Hat:rhel_eus:7.7::serverPackage registry (OSV)
rocky linux:libiscsi0:1.18.0-8.module+el8.7.0+1084+97b81f61 · Rocky Linux:8Package registry (OSV)
rocky linux:netcf0:0.2.8-12.module+el8.7.0+1084+97b81f61 · Rocky Linux:8Package registry (OSV)
rocky linux:sgabios1:0.20170427git-3.module+el8.7.0+1084+97b81f61 · Rocky Linux:8Package registry (OSV)
suse:kvm1.4.2-60.34.1 · SUSE:Linux Enterprise Server 11 SP4-LTSSPackage registry (OSV)

+2

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:32021-04-20
Proof-of-concept repository on GitHubstars:12021-08-13

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+231 d
  3. TodayNov 13, 2026+2265 d

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • Administrator privileges are required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
low · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Local
Attack complexity
High
Privileges required
High
User interaction
None
Scope
Changed
Confidentiality impact
Low
Integrity impact
Low
Availability impact
Low

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

References

Show all references (11 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records