Is CVE-2021-20263 in the CISA KEV catalog?

No. CVE-2021-20263 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-20263?

CVE-2021-20263 has a CVSS v3 base score of 3.3 (LOW).

What is the EPSS score for CVE-2021-20263?

CVE-2021-20263 has an EPSS score of 0.38% (30th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-20263?

Upgrade qemu on debian 11 to 1:5.2+dfsg-9 or later.

CVE & CISA-KEV Catalog

CVE-2021-20263

LOW

3.3

CVSS v3

NVD

Description

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.

CWE-281

How to fix

Remediation Available

qemuDebian

Fixed in:1:5.2+dfsg-9CVE-2021-20263

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 VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.38%probability of exploitation in 30 days

30thpercentile

Low risk: more likely to be exploited than 30% of all known CVEs.

References

Patch2

Third-Party Advisory2

Related Vulnerabilities

Other CWE-281 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-8543	Critical	9.8	74%	KEV	-
CVE-2019-0233	High	7.5	69%	-	-
CVE-2017-8589	Critical	9.8	26%	-	-
CVE-2021-33990	Critical	9.8	12%	-	-
CVE-2017-8563	High	8.1	7.2%	-	-
CVE-2017-8578	High	7.8	6.5%	-	-

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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.