Home/CVE/An integer overflow issue was found in the vmxnet3 NIC emulator of the QEMU for versions up to v5.2.0. It may occur if a
CVE

CVE-2021-20203

An integer overflow issue was found in the vmxnet3 NIC emulator of the QEMU for versions up to v5.2.0. It may occur if a

An integer overflow issue was found in the vmxnet3 NIC emulator of the QEMU for versions up to v5.2.0. It may occur if a guest was to supply invalid values for rx/tx queue size or other NIC parameters. A privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario.

LOW · CVSS 3.2 EPSS 0.00031
Schedule remediation
  • Public exploit or PoC is available
Sigma rules1 YARA rules0
⬡

Weakness Classification

CWE-190Integer Overflow or Wraparound
CWE-190Integer Overflow or Wraparound
▤

Affected Products & Versions

3
qemu<= 5.2.0
fedoraproject fedoraall versions
debian linuxall versions
⚠

Public Exploits & PoCs

1
pocbugs.launchpad.net · 1913873bugs.launchpad.net
◈

Sigma Hunt Rules

1
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumPotentially Suspicious Usage Of Qemu
▣

Scoring & Timeline

3.2
LOW · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD25 Feb 2021 · 08:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L
⚑

Vendor Advisories

11
suse-csafopenSUSE-SU-2024:11287-1
usnUSN-5307-1
suse-csafSUSE-SU-2021:1305-1
suse-csafSUSE-SU-2021:1240-1
suse-csafSUSE-SU-2021:1241-1
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bugzilla.redhat.com/show_bug.cgi?id=1922441Issue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/04/msg00009.htmlMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing ListThird Party Advisory
https://security.gentoo.org/glsa/202208-27Third Party Advisory
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