Is CVE-2018-20821 in the CISA KEV catalog?

No. CVE-2018-20821 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-20821?

CVE-2018-20821 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2018-20821?

CVE-2018-20821 has an EPSS score of 2.22% (80th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-20821?

Upgrade libsass on debian 11 to 3.6.3-1 or later.

CVE & CISA-KEV Catalog

CVE-2018-20821

MEDIUMEPSS 80th pctl

6.5

CVSS v3

NVD

Description

The parsing component in LibSass through 3.5.5 allows attackers to cause a denial-of-service (uncontrolled recursion in Sass::Parser::parse_css_variable_value in parser.cpp).

CWE-674

How to fix

Remediation Available

libsassDebian

Fixed in:3.6.3-1CVE-2018-20821

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 RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

2.22%probability of exploitation in 30 days

80thpercentile

Elevated risk: more likely to be exploited than 80% of all known CVEs.

References

Patch1

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.