CVE & CISA-KEV Catalog

CVE-2021-3682

HIGHEPSS 85th pctl
8.5
CVSS v3
NVD

Description

A flaw was found in the USB redirector device emulation of QEMU in versions prior to 6.1.0-rc2. It occurs when dropping packets during a bulk transfer from a SPICE client due to the packet queue being full. A malicious SPICE client could use this flaw to make QEMU call free() with faked heap chunk metadata, resulting in a crash of QEMU or potential code execution with the privileges of the QEMU process on the host.

CWE-763

How to fix

Remediation Available
qemuDebian
Fixed in:1:5.2+dfsg-11+deb11u1CVE-2021-3682
Fixed in:1:6.0+dfsg-3CVE-2021-3682
Fixed in:1:6.0+dfsg-3CVE-2021-3682
Fixed in:1:6.0+dfsg-3CVE-2021-3682
qemuUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.47+esm2USN-5772-1
Fixed in:1:2.5+dfsg-5ubuntu10.51+esm1USN-5772-1
Fixed in:1:2.11+dfsg-1ubuntu7.41USN-5772-1
Fixed in:1:2.11+dfsg-1ubuntu7.39USN-5307-1
Fixed in:1:4.2-3ubuntu6.21USN-5307-1
Fixed in:1:4.2-3ubuntu6.24USN-5772-1
Fixed in:1:6.2+dfsg-2ubuntu6.6USN-5772-1
Fixed in:1:7.0+dfsg-7ubuntu2.1USN-5772-1
qemu-systemUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.47+esm2USN-5772-1
Fixed in:1:2.5+dfsg-5ubuntu10.51+esm1USN-5772-1
Fixed in:1:2.11+dfsg-1ubuntu7.39USN-5307-1
Fixed in:1:2.11+dfsg-1ubuntu7.41USN-5772-1
Fixed in:1:4.2-3ubuntu6.24USN-5772-1
Fixed in:1:4.2-3ubuntu6.21USN-5307-1
Fixed in:1:6.2+dfsg-2ubuntu6.6USN-5772-1
Fixed in:1:7.0+dfsg-7ubuntu2.1USN-5772-1
qemu-system-aarch64Ubuntu
Fixed in:2.0.0+dfsg-2ubuntu1.47+esm2USN-5772-1
Fixed in:1:2.5+dfsg-5ubuntu10.51+esm1USN-5772-1
qemu-system-armUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.47+esm2USN-5772-1
Fixed in:1:2.5+dfsg-5ubuntu10.51+esm1USN-5772-1
Fixed in:1:2.11+dfsg-1ubuntu7.39USN-5307-1
Fixed in:1:2.11+dfsg-1ubuntu7.41USN-5772-1
Fixed in:1:4.2-3ubuntu6.21USN-5307-1
Fixed in:1:4.2-3ubuntu6.24USN-5772-1
Fixed in:1:6.2+dfsg-2ubuntu6.6USN-5772-1
Fixed in:1:7.0+dfsg-7ubuntu2.1USN-5772-1
qemu-system-mipsUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.47+esm2USN-5772-1
Fixed in:1:2.5+dfsg-5ubuntu10.51+esm1USN-5772-1
Fixed in:1:2.11+dfsg-1ubuntu7.39USN-5307-1
Fixed in:1:2.11+dfsg-1ubuntu7.41USN-5772-1
Fixed in:1:4.2-3ubuntu6.24USN-5772-1
Fixed in:1:4.2-3ubuntu6.21USN-5307-1
Fixed in:1:6.2+dfsg-2ubuntu6.6USN-5772-1
Fixed in:1:7.0+dfsg-7ubuntu2.1USN-5772-1
qemu-system-miscUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.47+esm2USN-5772-1
Fixed in:1:2.5+dfsg-5ubuntu10.51+esm1USN-5772-1
Fixed in:1:2.11+dfsg-1ubuntu7.39USN-5307-1
Fixed in:1:2.11+dfsg-1ubuntu7.41USN-5772-1
Fixed in:1:4.2-3ubuntu6.24USN-5772-1
Fixed in:1:4.2-3ubuntu6.21USN-5307-1
Fixed in:1:6.2+dfsg-2ubuntu6.6USN-5772-1
Fixed in:1:7.0+dfsg-7ubuntu2.1USN-5772-1
qemu-system-ppcUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.47+esm2USN-5772-1
Fixed in:1:2.5+dfsg-5ubuntu10.51+esm1USN-5772-1
Fixed in:1:2.11+dfsg-1ubuntu7.41USN-5772-1
Fixed in:1:2.11+dfsg-1ubuntu7.39USN-5307-1
Fixed in:1:4.2-3ubuntu6.24USN-5772-1
Fixed in:1:4.2-3ubuntu6.21USN-5307-1
Fixed in:1:6.2+dfsg-2ubuntu6.6USN-5772-1
Fixed in:1:7.0+dfsg-7ubuntu2.1USN-5772-1
qemu-system-s390xUbuntu
Fixed in:1:2.5+dfsg-5ubuntu10.51+esm1USN-5772-1
Fixed in:1:2.11+dfsg-1ubuntu7.41USN-5772-1
Fixed in:1:2.11+dfsg-1ubuntu7.39USN-5307-1
Fixed in:1:4.2-3ubuntu6.24USN-5772-1
Fixed in:1:4.2-3ubuntu6.21USN-5307-1
Fixed in:1:6.2+dfsg-2ubuntu6.6USN-5772-1
Fixed in:1:7.0+dfsg-7ubuntu2.1USN-5772-1
qemu-system-sparcUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.47+esm2USN-5772-1
Fixed in:1:2.5+dfsg-5ubuntu10.51+esm1USN-5772-1
Fixed in:1:2.11+dfsg-1ubuntu7.41USN-5772-1
Fixed in:1:2.11+dfsg-1ubuntu7.39USN-5307-1
Fixed in:1:4.2-3ubuntu6.24USN-5772-1
Fixed in:1:4.2-3ubuntu6.21USN-5307-1
Fixed in:1:6.2+dfsg-2ubuntu6.6USN-5772-1
Fixed in:1:7.0+dfsg-7ubuntu2.1USN-5772-1
qemu-system-x86Ubuntu
Fixed in:2.0.0+dfsg-2ubuntu1.47+esm2USN-5772-1
Fixed in:1:2.5+dfsg-5ubuntu10.51+esm1USN-5772-1
Fixed in:1:2.11+dfsg-1ubuntu7.41USN-5772-1
Fixed in:1:2.11+dfsg-1ubuntu7.39USN-5307-1
Fixed in:1:4.2-3ubuntu6.21USN-5307-1
Fixed in:1:4.2-3ubuntu6.24USN-5772-1
Fixed in:1:6.2+dfsg-2ubuntu6.6USN-5772-1
Fixed in:1:7.0+dfsg-7ubuntu2.1USN-5772-1
qemu-system-x86-microvmUbuntu
Fixed in:1:4.2-3ubuntu6.24USN-5772-1
Fixed in:1:4.2-3ubuntu6.21USN-5307-1
Fixed in:1:6.2+dfsg-2ubuntu6.6USN-5772-1
qemu-system-x86-xenUbuntu
Fixed in:1:4.2-3ubuntu6.24USN-5772-1
Fixed in:1:4.2-3ubuntu6.21USN-5307-1
Fixed in:1:6.2+dfsg-2ubuntu6.6USN-5772-1
Fixed in:1:7.0+dfsg-7ubuntu2.1USN-5772-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredLow
User InteractionNone
ScopeChanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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

Exploit Intelligence

2.90%probability of exploitation in 30 days
85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.