HOMEVULNERABILITIESCVE-2021-3611
MEDIUM

CVE-2021-3611

CWE-119Published: May 11, 2022· Updated: Jun 17, 2026

6.5
CVSS v3.1

Official Description

A stack overflow vulnerability was found in the Intel HD Audio device (intel-hda) of QEMU. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition. The highest threat from this vulnerability is to system availability. This flaw affects QEMU versions prior to 7.0.0.

NVD Source

Technical Analysis

CVE-2021-3611 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeChanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Affected Vendors & Products

qemu1 product(s)
qemu
Red Hat1 product(s)
enterprise linux
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

All References (8)

https://bugzilla.redhat.com/show_bug.cgi?id=1973784Issue Tracking · Mitigation · Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1973784Issue Tracking · Mitigation · Third Party Advisory

Quick Facts

CVE IDCVE-2021-3611
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-119
CISA KEVNo
Affected2 vendor(s)
PublishedMay 11, 2022

Related CVEs (CWE-119)

Recommended Actions

  • Apply vendor patches immediately
  • Monitor CVE-2021-3611 in threat intel feeds
  • Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.