Is CVE-2021-4157 in the CISA KEV catalog?

No. CVE-2021-4157 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-4157?

CVE-2021-4157 has a CVSS v3 base score of 8.0 (HIGH).

What is the EPSS score for CVE-2021-4157?

CVE-2021-4157 has an EPSS score of 1.58% (73th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-4157?

Upgrade linux on debian 11 to 5.10.38-1 or later. Fixes are available for 17 affected products.

CVE & CISA-KEV Catalog

CVE-2021-4157

HIGHEPSS 73th pctl

8.0

CVSS v3

NVD

Description

An out of memory bounds write flaw (1 or 2 bytes of memory) in the Linux kernel NFS subsystem was found in the way users use mirroring (replication of files with NFS). A user, having access to the NFS mount, could potentially use this flaw to crash the system or escalate privileges on the system.

CWE-119Buffer Overflow

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.38-1CVE-2021-4157

linuxUbuntu

Fixed in:4.4.0-224.257USN-5413-1

linux-awsUbuntu

Fixed in:4.4.0-1140.154USN-5413-1

linux-image-4.4.0-1105-kvmUbuntu

Fixed in:4.4.0-1105.114USN-5413-1

linux-image-4.4.0-1140-awsUbuntu

Fixed in:4.4.0-1140.154USN-5413-1

linux-image-4.4.0-224-genericUbuntu

Fixed in:4.4.0-224.257~14.04.1USN-5413-1

Fixed in:4.4.0-224.257USN-5413-1

linux-image-4.4.0-224-lowlatencyUbuntu

Fixed in:4.4.0-224.257~14.04.1USN-5413-1

Fixed in:4.4.0-224.257USN-5413-1

linux-image-awsUbuntu

Fixed in:4.4.0.1140.145USN-5413-1

linux-image-genericUbuntu

Fixed in:4.4.0.224.231USN-5413-1

linux-image-generic-lts-xenialUbuntu

Fixed in:4.4.0.224.195USN-5413-1

linux-image-kvmUbuntu

Fixed in:4.4.0.1105.103USN-5413-1

linux-image-lowlatencyUbuntu

Fixed in:4.4.0.224.231USN-5413-1

linux-image-lowlatency-lts-xenialUbuntu

Fixed in:4.4.0.224.195USN-5413-1

linux-image-virtualUbuntu

Fixed in:4.4.0.224.231USN-5413-1

linux-image-virtual-lts-xenialUbuntu

Fixed in:4.4.0.224.195USN-5413-1

linux-kvmUbuntu

Fixed in:4.4.0-1105.114USN-5413-1

linux-lts-xenialUbuntu

Fixed in:4.4.0-224.257~14.04.1USN-5413-1

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 VectorAdjacent

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.58%probability of exploitation in 30 days

73rdpercentile

Elevated risk: more likely to be exploited than 73% of all known CVEs.

References

Third-Party Advisory3

Other references1

lore.kernel.org

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2020-0796	Critical	10.0	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-

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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.