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No exploitation reportedFix available

CVE-2018-20821

No exploitation reported by the sources we read.

  • Published2019-04-23
  • WeaknessCWE-674

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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).

Timeline

dates in UTC
  1. 2019-04-2314:29CVE publishedNVD

Versions per branch

NVD
Sass-lang libsass
BranchAffectedFixed in
3.5≤ 3.5.5no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libsassSUSE:Package Hub 15 SP1all versions · fixed in 3.6.1-bp151.4.3.1
  • libsassSUSE:Package Hub 15all versions · fixed in 3.6.1-bp150.3.3.1
  • libsassopenSUSE:Leap 15.1all versions · fixed in 3.6.1-lp151.3.3.1
  • libsassopenSUSE:Leap 15.0all versions · fixed in 3.6.1-lp151.3.3.1
  • libsassMageia:7all versions · fixed in 3.6.1-1.mga7
  • libsassDebian:14all versions · fixed in 3.6.3-1
  • libsassDebian:13all versions · fixed in 3.6.3-1
  • libsassDebian:12all versions · fixed in 3.6.3-1

Vendor advisories

  • CVE-2018-20821 Red Hat Product Security

    libsass: parsing component allows attackers to cause denial-of-service

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Published
2019-04-23
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-j7pw-5g39-c2cj

Frequently asked questions

What is CVE-2018-20821?

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).

Is CVE-2018-20821 actively exploited?

Active exploitation of CVE-2018-20821 has not been confirmed. Its EPSS score was 2.2% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

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

CVE-2018-20821 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

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