Is CVE-2021-3178 in the CISA KEV catalog?

No. CVE-2021-3178 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3178?

CVE-2021-3178 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2021-3178?

CVE-2021-3178 has an EPSS score of 2.42% (82th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3178?

Upgrade linux on debian 11 to 5.10.12-1 or later. Fixes are available for 121 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3178

MEDIUMEPSS 82th pctl

6.5

CVSS v3

NVD

Description

fs/nfsd/nfs3xdr.c in the Linux kernel through 5.10.8, when there is an NFS export of a subdirectory of a filesystem, allows remote attackers to traverse to other parts of the filesystem via READDIRPLUS. NOTE: some parties argue that such a subdirectory export is not intended to prevent this attack; see also the exports(5) no_subtree_check default behavior

CWE-22Path Traversal

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.12-1CVE-2021-3178

linuxUbuntu

Fixed in:4.4.0-204.236USN-4876-1

Fixed in:4.15.0-137.141USN-4877-1

Fixed in:5.4.0-67.75USN-4878-1

linux-awsUbuntu

Fixed in:4.4.0-1087.91USN-4876-1

Fixed in:4.4.0-1123.137USN-4876-1

Fixed in:4.15.0-1095.102USN-4877-1

Fixed in:5.4.0-1039.41USN-4878-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1039.41~18.04.1USN-4878-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1095.102~16.04.1USN-4877-1

linux-azureUbuntu

Fixed in:4.15.0-1109.121~14.04.1USN-4877-1

Fixed in:4.15.0-1109.121~16.04.1USN-4877-1

Fixed in:5.4.0-1041.43USN-4878-1

linux-azure-4.15Ubuntu

Fixed in:4.15.0-1109.121USN-4877-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1041.43~18.04.1USN-4878-1

linux-dell300xUbuntu

Fixed in:4.15.0-1013.17USN-4877-1

linux-gcpUbuntu

Fixed in:4.15.0-1094.107~16.04.1USN-4877-1

Fixed in:5.4.0-1038.41USN-4878-1

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1094.107USN-4877-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1038.41~18.04.1USN-4878-1

linux-gke-5.4Ubuntu

Fixed in:5.4.0-1037.39~18.04.1USN-4878-1

linux-gkeopUbuntu

Fixed in:5.4.0-1011.12USN-4878-1

linux-gkeop-5.4Ubuntu

Fixed in:5.4.0-1011.12~18.04.2USN-4878-1

linux-hweUbuntu

Fixed in:4.15.0-137.141~16.04.1USN-4877-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-67.75~18.04.1USN-4878-1

linux-hwe-5.8Ubuntu

Fixed in:5.8.0-49.55~20.04.1USN-4910-1

linux-image-4.15.0-1013-dell300xUbuntu

Fixed in:4.15.0-1013.17USN-4877-1

linux-image-4.15.0-1066-oracleUbuntu

Fixed in:4.15.0-1066.74~16.04.1USN-4877-1

Fixed in:4.15.0-1066.74USN-4877-1

linux-image-4.15.0-1080-raspi2Ubuntu

Fixed in:4.15.0-1080.85USN-4877-1

linux-image-4.15.0-1086-kvmUbuntu

Fixed in:4.15.0-1086.88USN-4877-1

linux-image-4.15.0-1094-gcpUbuntu

Fixed in:4.15.0-1094.107~16.04.1USN-4877-1

Fixed in:4.15.0-1094.107USN-4877-1

linux-image-4.15.0-1095-awsUbuntu

Fixed in:4.15.0-1095.102~16.04.1USN-4877-1

Fixed in:4.15.0-1095.102USN-4877-1

linux-image-4.15.0-1097-snapdragonUbuntu

Fixed in:4.15.0-1097.106USN-4877-1

linux-image-4.15.0-1109-azureUbuntu

Fixed in:4.15.0-1109.121~14.04.1USN-4877-1

Fixed in:4.15.0-1109.121~16.04.1USN-4877-1

Fixed in:4.15.0-1109.121USN-4877-1

linux-image-4.15.0-137-genericUbuntu

Fixed in:4.15.0-137.141~16.04.1USN-4877-1

Fixed in:4.15.0-137.141USN-4877-1

linux-image-4.15.0-137-generic-lpaeUbuntu

Fixed in:4.15.0-137.141~16.04.1USN-4877-1

Fixed in:4.15.0-137.141USN-4877-1

linux-image-4.15.0-137-lowlatencyUbuntu

Fixed in:4.15.0-137.141~16.04.1USN-4877-1

Fixed in:4.15.0-137.141USN-4877-1

linux-image-4.4.0-1087-awsUbuntu

Fixed in:4.4.0-1087.91USN-4876-1

linux-image-4.4.0-1089-kvmUbuntu

Fixed in:4.4.0-1089.98USN-4876-1

linux-image-4.4.0-1123-awsUbuntu

Fixed in:4.4.0-1123.137USN-4876-1

linux-image-4.4.0-1147-raspi2Ubuntu

Fixed in:4.4.0-1147.157USN-4876-1

linux-image-4.4.0-1151-snapdragonUbuntu

Fixed in:4.4.0-1151.161USN-4876-1

linux-image-4.4.0-204-genericUbuntu

Fixed in:4.4.0-204.236~14.04.1USN-4876-1

Fixed in:4.4.0-204.236USN-4876-1

linux-image-4.4.0-204-generic-lpaeUbuntu

Fixed in:4.4.0-204.236~14.04.1USN-4876-1

Fixed in:4.4.0-204.236USN-4876-1

linux-image-4.4.0-204-lowlatencyUbuntu

Fixed in:4.4.0-204.236~14.04.1USN-4876-1

Fixed in:4.4.0-204.236USN-4876-1

linux-image-4.4.0-204-powerpc-e500mcUbuntu

Fixed in:4.4.0-204.236~14.04.1USN-4876-1

Fixed in:4.4.0-204.236USN-4876-1

linux-image-4.4.0-204-powerpc-smpUbuntu

Fixed in:4.4.0-204.236~14.04.1USN-4876-1

Fixed in:4.4.0-204.236USN-4876-1

linux-image-4.4.0-204-powerpc64-embUbuntu

Fixed in:4.4.0-204.236~14.04.1USN-4876-1

Fixed in:4.4.0-204.236USN-4876-1

linux-image-4.4.0-204-powerpc64-smpUbuntu

Fixed in:4.4.0-204.236~14.04.1USN-4876-1

Fixed in:4.4.0-204.236USN-4876-1

linux-image-5.4.0-1011-gkeopUbuntu

Fixed in:5.4.0-1011.12~18.04.2USN-4878-1

Fixed in:5.4.0-1011.12USN-4878-1

linux-image-5.4.0-1030-raspiUbuntu

Fixed in:5.4.0-1030.33~18.04.1USN-4878-1

Fixed in:5.4.0-1030.33USN-4878-1

linux-image-5.4.0-1034-kvmUbuntu

Fixed in:5.4.0-1034.35USN-4878-1

linux-image-5.4.0-1037-gkeUbuntu

Fixed in:5.4.0-1037.39~18.04.1USN-4878-1

linux-image-5.4.0-1038-gcpUbuntu

Fixed in:5.4.0-1038.41~18.04.1USN-4878-1

Fixed in:5.4.0-1038.41USN-4878-1

linux-image-5.4.0-1039-awsUbuntu

Fixed in:5.4.0-1039.41~18.04.1USN-4878-1

Fixed in:5.4.0-1039.41USN-4878-1

linux-image-5.4.0-1039-oracleUbuntu

Fixed in:5.4.0-1039.42~18.04.1USN-4878-1

Fixed in:5.4.0-1039.42USN-4878-1

linux-image-5.4.0-1041-azureUbuntu

Fixed in:5.4.0-1041.43~18.04.1USN-4878-1

Fixed in:5.4.0-1041.43USN-4878-1

linux-image-5.4.0-67-genericUbuntu

Fixed in:5.4.0-67.75~18.04.1USN-4878-1

Fixed in:5.4.0-67.75USN-4878-1

linux-image-5.4.0-67-generic-lpaeUbuntu

Fixed in:5.4.0-67.75~18.04.1USN-4878-1

Fixed in:5.4.0-67.75USN-4878-1

linux-image-5.4.0-67-lowlatencyUbuntu

Fixed in:5.4.0-67.75~18.04.1USN-4878-1

Fixed in:5.4.0-67.75USN-4878-1

linux-image-5.6.0-1053-oemUbuntu

Fixed in:5.6.0-1053.57USN-4912-1

linux-image-5.8.0-49-genericUbuntu

Fixed in:5.8.0-49.55~20.04.1USN-4910-1

linux-image-5.8.0-49-generic-64kUbuntu

Fixed in:5.8.0-49.55~20.04.1USN-4910-1

linux-image-5.8.0-49-generic-lpaeUbuntu

Fixed in:5.8.0-49.55~20.04.1USN-4910-1

linux-image-5.8.0-49-lowlatencyUbuntu

Fixed in:5.8.0-49.55~20.04.1USN-4910-1

linux-image-awsUbuntu

Fixed in:4.4.0.1087.84USN-4876-1

Fixed in:4.4.0.1123.128USN-4876-1

Fixed in:5.4.0.1039.23USN-4878-1

Fixed in:5.4.0.1039.40USN-4878-1

linux-image-aws-edgeUbuntu

Fixed in:5.4.0.1039.23USN-4878-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1095.88USN-4877-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1095.98USN-4877-1

linux-image-azureUbuntu

Fixed in:4.15.0.1109.82USN-4877-1

Fixed in:4.15.0.1109.100USN-4877-1

Fixed in:5.4.0.1041.21USN-4878-1

Fixed in:5.4.0.1041.39USN-4878-1

linux-image-azure-edgeUbuntu

Fixed in:5.4.0.1041.21USN-4878-1

linux-image-azure-lts-18.04Ubuntu

Fixed in:4.15.0.1109.82USN-4877-1

linux-image-dell300xUbuntu

Fixed in:4.15.0.1013.15USN-4877-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1094.95USN-4877-1

Fixed in:5.4.0.1038.25USN-4878-1

Fixed in:5.4.0.1038.47USN-4878-1

linux-image-gcp-edgeUbuntu

Fixed in:5.4.0.1038.25USN-4878-1

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1094.112USN-4877-1

linux-image-genericUbuntu

Fixed in:4.4.0.204.210USN-4876-1

Fixed in:4.15.0.137.124USN-4877-1

Fixed in:5.4.0.67.70USN-4878-1

linux-image-generic-64k-hwe-20.04Ubuntu

Fixed in:5.8.0.49.55~20.04.33USN-4910-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.137.133USN-4877-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.67.75~18.04.62USN-4878-1

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.8.0.49.55~20.04.33USN-4910-1

linux-image-generic-lpaeUbuntu

Fixed in:4.4.0.204.210USN-4876-1

Fixed in:4.15.0.137.124USN-4877-1

Fixed in:5.4.0.67.70USN-4878-1

linux-image-generic-lpae-hwe-16.04Ubuntu

Fixed in:4.15.0.137.133USN-4877-1

linux-image-generic-lpae-hwe-18.04Ubuntu

Fixed in:5.4.0.67.75~18.04.62USN-4878-1

linux-image-generic-lpae-hwe-20.04Ubuntu

Fixed in:5.8.0.49.55~20.04.33USN-4910-1

linux-image-generic-lpae-lts-xenialUbuntu

Fixed in:4.4.0.204.178USN-4876-1

linux-image-generic-lts-xenialUbuntu

Fixed in:4.4.0.204.178USN-4876-1

linux-image-gkeUbuntu

Fixed in:4.15.0.1094.95USN-4877-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1037.39~18.04.5USN-4878-1

linux-image-gkeopUbuntu

Fixed in:5.4.0.1011.14USN-4878-1

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.1011.12~18.04.12USN-4878-1

Fixed in:5.4.0.1011.14USN-4878-1

linux-image-kvmUbuntu

Fixed in:4.4.0.1089.87USN-4876-1

Fixed in:4.15.0.1086.82USN-4877-1

Fixed in:5.4.0.1034.32USN-4878-1

linux-image-lowlatencyUbuntu

Fixed in:4.4.0.204.210USN-4876-1

Fixed in:4.15.0.137.124USN-4877-1

Fixed in:5.4.0.67.70USN-4878-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.137.133USN-4877-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.67.75~18.04.62USN-4878-1

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.8.0.49.55~20.04.33USN-4910-1

linux-image-lowlatency-lts-xenialUbuntu

Fixed in:4.4.0.204.178USN-4876-1

linux-image-oemUbuntu

Fixed in:4.15.0.137.133USN-4877-1

Fixed in:5.4.0.67.75~18.04.62USN-4878-1

Fixed in:5.4.0.67.70USN-4878-1

linux-image-oem-20.04Ubuntu

Fixed in:5.6.0.1053.49USN-4912-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.67.75~18.04.62USN-4878-1

Fixed in:5.4.0.67.70USN-4878-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1066.54USN-4877-1

Fixed in:5.4.0.1039.42~18.04.22USN-4878-1

Fixed in:5.4.0.1039.36USN-4878-1

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1066.76USN-4877-1

linux-image-powerpc-e500mcUbuntu

Fixed in:4.4.0.204.210USN-4876-1

linux-image-powerpc-e500mc-lts-xenialUbuntu

Fixed in:4.4.0.204.178USN-4876-1

linux-image-powerpc-smpUbuntu

Fixed in:4.4.0.204.210USN-4876-1

linux-image-powerpc-smp-lts-xenialUbuntu

Fixed in:4.4.0.204.178USN-4876-1

linux-image-powerpc64-embUbuntu

Fixed in:4.4.0.204.210USN-4876-1

linux-image-powerpc64-emb-lts-xenialUbuntu

Fixed in:4.4.0.204.178USN-4876-1

linux-image-powerpc64-smpUbuntu

Fixed in:4.4.0.204.210USN-4876-1

linux-image-powerpc64-smp-lts-xenialUbuntu

Fixed in:4.4.0.204.178USN-4876-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1030.65USN-4878-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1030.33USN-4878-1

linux-image-raspi2Ubuntu

Fixed in:4.4.0.1147.147USN-4876-1

Fixed in:4.15.0.1080.77USN-4877-1

Fixed in:5.4.0.1030.65USN-4878-1

linux-image-snapdragonUbuntu

Fixed in:4.4.0.1151.143USN-4876-1

Fixed in:4.15.0.1097.100USN-4877-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.67.75~18.04.62USN-4878-1

linux-image-virtualUbuntu

Fixed in:4.4.0.204.210USN-4876-1

Fixed in:4.15.0.137.124USN-4877-1

Fixed in:5.4.0.67.70USN-4878-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.137.133USN-4877-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.67.75~18.04.62USN-4878-1

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.8.0.49.55~20.04.33USN-4910-1

linux-image-virtual-lts-xenialUbuntu

Fixed in:4.4.0.204.178USN-4876-1

linux-kvmUbuntu

Fixed in:4.4.0-1089.98USN-4876-1

Fixed in:4.15.0-1086.88USN-4877-1

Fixed in:5.4.0-1034.35USN-4878-1

linux-lts-xenialUbuntu

Fixed in:4.4.0-204.236~14.04.1USN-4876-1

linux-oem-5.6Ubuntu

Fixed in:5.6.0-1053.57USN-4912-1

linux-oracleUbuntu

Fixed in:4.15.0-1066.74~16.04.1USN-4877-1

Fixed in:4.15.0-1066.74USN-4877-1

Fixed in:5.4.0-1039.42USN-4878-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1039.42~18.04.1USN-4878-1

linux-raspiUbuntu

Fixed in:5.4.0-1030.33USN-4878-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1030.33~18.04.1USN-4878-1

linux-raspi2Ubuntu

Fixed in:4.4.0-1147.157USN-4876-1

Fixed in:4.15.0-1080.85USN-4877-1

linux-snapdragonUbuntu

Fixed in:4.4.0-1151.161USN-4876-1

Fixed in:4.15.0-1097.106USN-4877-1

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 VectorNetwork

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

2.42%probability of exploitation in 30 days

82ndpercentile

Elevated risk: more likely to be exploited than 82% of all known CVEs.

References

Patch1

git.kernel.org

Third-Party Advisory1

lists.debian.org

Other references2

Related Vulnerabilities

Other CWE-22 (Path Traversal) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-23897	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-32315	High	8.6	100%	KEV	Fix
CVE-2022-29464	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-26086	Medium	5.3	100%	KEV	Fix
CVE-2021-22005	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-5902	Critical	9.8	100%	KEV + Ransom	Fix

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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.