CVE-2021-20263

lowpriority · track · 13EPSS 0.004 · 31 %ileEURUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.38% (31st) EPSS
CVSS 2.1 · low
Is it mine?
8 products
Check your exposure
Who says so?
4 sources
cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

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.

01

cvss

Technical severity, 0–10. One row per scoring source.

3.3
010

base score 0–10 · higher = more severe · hover a vector to decode

v2.02.1lowAV:L/AC:L/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 2.9
v3.13.3lowCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Nprimary · NVD / NIST USexploitability 1.8 · impact 1.4
v3.13.3lowAV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Nsecondary · FSTEC (BDU) RU
v3.13.1lowCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)
02

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-281USCWE-281US
03

affected products (8)

Products and version ranges known to be affected.

04

also known as (4)

Other names and identifiers for this entity.

05

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bdunvdNVDCVE.orgMITRE
published 2021-03-09modified 2026-06-17
06

references (15)

External citations — patches, advisories, analysis.

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