Is CVE-2021-4120 in the CISA KEV catalog?

No. CVE-2021-4120 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-4120?

CVE-2021-4120 has a CVSS v3 base score of 8.2 (HIGH).

What is the EPSS score for CVE-2021-4120?

CVE-2021-4120 has an EPSS score of 0.43% (35th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-4120?

Upgrade snapd on debian 11 to 2.49-1+deb11u1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-4120

HIGH

8.2

CVSS v3

NVD

Description

snapd 2.54.2 fails to perform sufficient validation of snap content interface and layout paths, resulting in the ability for snaps to inject arbitrary AppArmor policy rules via malformed content interface and layout declarations and hence escape strict snap confinement. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1

CWE-20Improper Input Validation

How to fix

Remediation Available

snapdDebian

Fixed in:2.49-1+deb11u1CVE-2021-4120

Fixed in:2.54.3-1CVE-2021-4120

snap-confineUbuntu

Fixed in:2.54.3+14.04~esm1USN-5292-3

Fixed in:2.54.3+16.04~esm2USN-5292-3

Fixed in:2.54.3+18.04USN-5292-1

Fixed in:2.54.3+20.04USN-5292-1

Fixed in:2.54.3+20.04.1USN-5292-2

snapdUbuntu

Fixed in:2.54.3+14.04~esm1USN-5292-3

Fixed in:2.54.3+16.04~esm2USN-5292-3

Fixed in:2.54.3+18.04USN-5292-1

Fixed in:2.54.3+20.04USN-5292-1

Fixed in:2.54.3+20.04.1USN-5292-2

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 InteractionRequired

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.43%probability of exploitation in 30 days

35thpercentile

Low risk: more likely to be exploited than 35% of all known CVEs.

References

Patch1

ubuntu.com

Exploit2

Other references2

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	KEV	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.