CVE-2021-20263

3.3 lowEPSS 0.4%

Low (3.3) in qemu qemu. EPSS 0.4% chance of exploitation in the next 30 days.

A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new 'xattrmap' option may cause the 'security.capability' xattr in the guest to not drop on file write, potentially leading to a modified, privileged executable in the guest. In rare circumstances, this flaw could be used by a malicious user to elevate their privileges within the guest.

Severity

CVSS 3.1

3.3 low

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

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 31% of CVEs (scores of 2026-10-31)
CWE: CWE-281
Published: 2021-03-09
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

qemu:qemu

References

https://bugzilla.redhat.com/show_bug.cgi?id=1933668
https://security.gentoo.org/glsa/202208-27
https://security.netapp.com/advisory/ntap-20210507-0002/
https://www.openwall.com/lists/oss-security/2021/03/08/1
https://bugzilla.redhat.com/show_bug.cgi?id=1933668

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