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CVE-2019-6284

19
FAUCET Score

CVE-2019-6284 describes a heap-based buffer over-read vulnerability in LibSass 3.5.5, specifically within the Sass::Prelexer::alternatives function, affecting sass-lang libsass. With a CVSS score of 6.5 (Medium), this vulnerability can be exploited remotely with low attack complexity, requiring user interaction, and could lead to a high impact on availability, though confidentiality and integrity are not affected. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage, indicating a low current threat landscape.

Impacted Technologies

VendorProductVersion(s)CPE
3.5.5CPE matchmatch criteria
cpe:2.3:a:sass-lang:libsass:3.5.5:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.10%
Probability of exploitation in next 30 days
EPSS Percentile
79.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0210 is in the 90th percentile among its peer group of 26,234 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2019-6284Low

libsass: heap-based buffer over-read in Sass::Prelexer::alternatives in prelexer.hpp

Jan 14, 2019

References

lists.opensuse.org / opensuse-security-announce/2019-07/msg00047.html
Broken Link
lists.opensuse.org / opensuse-security-announce/2019-07/msg00051.html
Broken Link
lists.opensuse.org / opensuse-security-announce/2019-08/msg00027.html
Broken Link
github.com / sass/libsass/issues/2816
ExploitThird Party Advisory