HOMEVULNERABILITIESCVE-2021-3631
MEDIUM

CVE-2021-3631

CWE-732Published: March 2, 2022· Updated: Jun 17, 2026

6.3
CVSS v3.1

Official Description

A flaw was found in libvirt while it generates SELinux MCS category pairs for VMs' dynamic labels. This flaw allows one exploited guest to access files labeled for another guest, resulting in the breaking out of sVirt confinement. The highest threat from this vulnerability is to confidentiality and integrity.

NVD Source

Technical Analysis

CVE-2021-3631 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 complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 6.3.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityHigh
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected Vendors & Products

netapp1 product(s)
ontap select deploy administration utility
Red Hat3 product(s)
libvirtopenshift container platformenterprise linux
Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://gitlab.com/libvirt/libvirt/-/commit/15073504dbb624d3f6c911e85557019d3620fdb2
PATCHhttps://gitlab.com/libvirt/libvirt/-/commit/15073504dbb624d3f6c911e85557019d3620fdb2
ADVISORYhttps://access.redhat.com/errata/RHSA-2021:3631
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=1977726
ADVISORYhttps://gitlab.com/libvirt/libvirt/-/issues/153
ADVISORYhttps://security.gentoo.org/glsa/202210-06
ADVISORYhttps://security.netapp.com/advisory/ntap-20220331-0010/
ADVISORYhttps://access.redhat.com/errata/RHSA-2021:3631
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=1977726
ADVISORYhttps://gitlab.com/libvirt/libvirt/-/issues/153
ADVISORYhttps://security.gentoo.org/glsa/202210-06
ADVISORYhttps://security.netapp.com/advisory/ntap-20220331-0010/

All References (14)

→
https://access.redhat.com/errata/RHSA-2021:3631Vendor Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=1977726Issue Tracking · Vendor Advisory
→
https://gitlab.com/libvirt/libvirt/-/commit/15073504dbb624d3f6c911e85557019d3620fdb2Patch · Third Party Advisory
→
https://gitlab.com/libvirt/libvirt/-/issues/153Exploit · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
→
https://security.gentoo.org/glsa/202210-06Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20220331-0010/Third Party Advisory
→
https://access.redhat.com/errata/RHSA-2021:3631Vendor Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=1977726Issue Tracking · Vendor Advisory
→
https://gitlab.com/libvirt/libvirt/-/commit/15073504dbb624d3f6c911e85557019d3620fdb2Patch · Third Party Advisory
→
https://gitlab.com/libvirt/libvirt/-/issues/153Exploit · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
→
https://security.gentoo.org/glsa/202210-06Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20220331-0010/Third Party Advisory

Quick Facts

CVE IDCVE-2021-3631
CVSS Score6.3 / 10
SeverityMEDIUM
WeaknessCWE-732
CISA KEVNo
Affected2 vendor(s)
PublishedMar 2, 2022

Related CVEs (CWE-732)

CVE-2025-12004
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CVE-2025-69426
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CVE-2014-125121
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CVE-2026-9508
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CVE-2023-40622
9.9
CVE-2025-49131
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Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-3631 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. CVE data is provided under the NVD usage policy.
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