Is CVE-2021-43816 in the CISA KEV catalog?

No. CVE-2021-43816 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-43816?

CVE-2021-43816 has a CVSS v3 base score of 8.0 (HIGH).

What is the EPSS score for CVE-2021-43816?

CVE-2021-43816 has an EPSS score of 1.69% (75th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-43816?

Upgrade containerd on debian 12 to 1.5.9~ds1-1 or later.

CVE & CISA-KEV Catalog

CVE-2021-43816

HIGHEPSS 75th pctl

8.0

CVSS v3

NVD

Description

containerd is an open source container runtime. On installations using SELinux, such as EL8 (CentOS, RHEL), Fedora, or SUSE MicroOS, with containerd since v1.5.0-beta.0 as the backing container runtime interface (CRI), an unprivileged pod scheduled to the node may bind mount, via hostPath volume, any privileged, regular file on disk for complete read/write access (sans delete). Such is achieved by placing the in-container location of the hostPath volume mount at either `/etc/hosts`, `/etc/hostname`, or `/etc/resolv.conf`. These locations are being relabeled indiscriminately to match the container process-label which effectively elevates permissions for savvy containers that would not normally be able to access privileged host files. This issue has been resolved in version 1.5.9. Users are advised to upgrade as soon as possible.

CWE-281

How to fix

Remediation Available

containerdDebian

Fixed in:1.5.9~ds1-1CVE-2021-43816

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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 ComplexityHigh

Privileges RequiredHigh

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.69%probability of exploitation in 30 days

75thpercentile

Elevated risk: more likely to be exploited than 75% of all known CVEs.

References

Patch2

Exploit1

github.com

Third-Party Advisory1

github.com

Other references2

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%	-	-

Embed a live status badge for CVE-2021-43816

Markdown

[![CVE-2021-43816](https://tridentstack.com/cve/badge/CVE-2021-43816.svg)](https://tridentstack.com/cve/CVE-2021-43816)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-43816"><img src="https://tridentstack.com/cve/badge/CVE-2021-43816.svg" alt="CVE-2021-43816"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it works Start freeThis CVE lookup is free and always will be.

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.