Is CVE-2021-41091 in the CISA KEV catalog?

No. CVE-2021-41091 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-41091?

CVE-2021-41091 has a CVSS v3 base score of 6.3 (MEDIUM).

What is the EPSS score for CVE-2021-41091?

CVE-2021-41091 has an EPSS score of 2.69% (84th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-41091?

Upgrade docker.io on debian 11 to 20.10.5+dfsg1-1+deb11u1 or later.

CVE & CISA-KEV Catalog

CVE-2021-41091

MEDIUMEPSS 84th pctl

6.3

CVSS v3

NVD

Description

Moby is an open-source project created by Docker to enable software containerization. A bug was found in Moby (Docker Engine) where the data directory (typically `/var/lib/docker`) contained subdirectories with insufficiently restricted permissions, allowing otherwise unprivileged Linux users to traverse directory contents and execute programs. When containers included executable programs with extended permission bits (such as `setuid`), unprivileged Linux users could discover and execute those programs. When the UID of an unprivileged Linux user on the host collided with the file owner or group inside a container, the unprivileged Linux user on the host could discover, read, and modify those files. This bug has been fixed in Moby (Docker Engine) 20.10.9. Users should update to this version as soon as possible. Running containers should be stopped and restarted for the permissions to be fixed. For users unable to upgrade limit access to the host to trusted users. Limit access to host volumes to trusted containers.

CWE-281 CWE-732Incorrect Permission Assignment for Critical Resource

How to fix

Remediation Available

docker.ioDebian

Fixed in:20.10.5+dfsg1-1+deb11u1CVE-2021-41091

Fixed in:20.10.10+dfsg1-1CVE-2021-41091

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

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityLow

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

Exploit Intelligence

2.69%probability of exploitation in 30 days

84thpercentile

Elevated risk: more likely to be exploited than 84% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory1

github.com

Other references3

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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.