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.
CVE-2017-11554
HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence
Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 7.5; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 7.5Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.5
- EG Score
- 7.5(medium)
- EPSS
- 76.9%
- KEV
- Not listed
Published
July 23, 2017
Last Modified
May 13, 2026
References (4)
- cve@mitrehttps://bugzilla.redhat.com/show_bug.cgi?id=1471780
- cve@mitrehttps://github.com/sass/libsass/issues/2445
- af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=1471780
- af854a3a-2127-422b-91ae-364da2661108https://github.com/sass/libsass/issues/2445
Frequently asked(5)
What is CVE-2017-11554?
CVE-2017-11554 is a high vulnerability published on July 23, 2017. 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.
When was CVE-2017-11554 disclosed?
CVE-2017-11554 was first published in the National Vulnerability Database on July 23, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-11554 actively exploited?
CVE-2017-11554 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 76.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2017-11554?
CVE-2017-11554 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2017-11554?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-11554, 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
Explore the affected products and dependency analysis for CVE-2017-11554
Is Your Infrastructure Affected by CVE-2017-11554?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.