Is CVE-2017-11556 in the CISA KEV catalog?

No. CVE-2017-11556 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-11556?

CVE-2017-11556 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2017-11556?

CVE-2017-11556 has an EPSS score of 1.20% (64th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-11556?

Upgrade libsass on debian 11 to 3.5.4-1 or later.

CVE & CISA-KEV Catalog

CVE-2017-11556

HIGH

7.5

CVSS v3

NVD

Description

There is a stack consumption vulnerability in the Parser::advanceToNextToken function in parser.cpp in LibSass 3.4.5. A crafted input may lead to remote denial of service.

CWE-674

How to fix

Remediation Available

libsassDebian

Fixed in:3.5.4-1CVE-2017-11556

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 InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

1.20%probability of exploitation in 30 days

64thpercentile

Moderate risk: more likely to be exploited than 64% of all known CVEs.

References

Exploit1

bugzilla.redhat.com

Related Vulnerabilities

Other CWE-674 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2024-25111	High	8.6	65%	-	Fix
CVE-2023-50269	High	8.6	58%	-	Fix
CVE-2021-42697	High	7.5	36%	-	Fix
CVE-2018-0739	Medium	6.5	19%	-	Fix
CVE-2007-1285	High	7.5	18%	-	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 2026-05-13.