Is CVE-2017-11554 in the CISA KEV catalog?

No. CVE-2017-11554 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-11554?

CVE-2017-11554 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2017-11554?

CVE-2017-11554 has an EPSS score of 1.88% (77th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-11554?

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

CVE & CISA-KEV Catalog

CVE-2017-11554

HIGHEPSS 77th pctl

7.5

CVSS v3

NVD

Description

There is a stack consumption vulnerability in the lex function in parser.hpp (as used in sassc) in LibSass 3.4.5. A crafted input will lead to a remote denial of service.

CWE-674

How to fix

Remediation Available

libsassDebian

Fixed in:3.5.4-1CVE-2017-11554

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

1.88%probability of exploitation in 30 days

77thpercentile

Elevated risk: more likely to be exploited than 77% of all known CVEs.

References

Exploit1

bugzilla.redhat.com

Third-Party Advisory1

github.com

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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.