CVE-2018-20821

MEDIUMNVD 6.56.5—

6.5

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).

CVSS v3: 6.5
EG Score: 6.5(medium)
EPSS: 72.8%
KEV: Not listed

Published

April 23, 2019

Last Modified

November 21, 2024

References (8)

cve@mitrehttp://lists.opensuse.org/opensuse-security-announce/2019-07/msg00047.html
cve@mitrehttp://lists.opensuse.org/opensuse-security-announce/2019-07/msg00051.html
cve@mitrehttp://lists.opensuse.org/opensuse-security-announce/2019-08/msg00027.html
cve@mitrehttps://github.com/sass/libsass/issues/2658
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00047.html
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00051.html
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00027.html
af854a3a-2127-422b-91ae-364da2661108https://github.com/sass/libsass/issues/2658

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-674Uncontrolled Recursion

Data Freshness Timeline

(refreshed 9× in last 7d / 9× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 20:21 UTCEG score recompute
2026-05-27 20:21 UTCGHSA enrichment
2026-05-27 13:38 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-23 03:35 UTCOSV refresh

Frequently asked(5)

What is CVE-2018-20821?

CVE-2018-20821 is a medium vulnerability published on April 23, 2019. The parsing component in LibSass through 3.5.5 allows attackers to cause a denial-of-service (uncontrolled recursion in Sass::Parser::parsecssvariable_value in parser.cpp).

When was CVE-2018-20821 disclosed?

CVE-2018-20821 was first published in the National Vulnerability Database on April 23, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2018-20821 actively exploited?

CVE-2018-20821 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 72.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

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

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

How do I remediate CVE-2018-20821?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-20821, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2018-20821

📅 Published

🔄 Last Modified

🔗 References (8)