VDB

CVE-2021-20203

CVE-2021-20203 PUBLISHED

Reported by redhat · Published February 25, 2021

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.

Fixed versions

Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.

PackageEcosystemFixed in
qemuUbuntu:22.04:LTS1:6.2+dfsg-2ubuntu5
qemuqemu5.2.0

Affected products

VendorProductVersions
n/aqemuversions up to v5.2.0
n/aqemu5.2.0
alpineqemu0, 0

Timeline

  • Feb 19, 2021 CVE Published
  • Apr 14, 2021 EPSS Score (30 in total, the first dated here)
  • Aug 3, 2024 CVE Updated
  • Mar 7, 2026 Distribution Patch (6 in total, the first dated here)
  • Mar 7, 2026 Security Advisory (9 in total, the first dated here)

Query this with the API

The same record, from the CLI:

vulnetix vdb vuln CVE-2021-20203
vulnetix vdb fixes CVE-2021-20203

Or with curl, using the org id and key from your account page:

curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
  "https://api.vdb.vulnetix.com/v2/vuln/CVE-2021-20203/fixes/registry"

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References

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