CVE-2021-32012

MEDIUMNVD 5.55.5—

5.5

SheetJS and SheetJS Pro through 0.16.9 allows attackers to cause a denial of service (memory consumption) via a crafted .xlsx document that is mishandled when read by xlsx.js (issue 1 of 2).

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 43.6%
KEV: Not listed

Published

July 19, 2021

Last Modified

November 21, 2024

References (8)

cve@mitrehttps://floqast.com/engineering-blog/post/fuzzing-and-parsing-securely/
cve@mitrehttps://sheetjs.com/pro
cve@mitrehttps://www.npmjs.com/package/xlsx/v/0.17.0
cve@mitrehttps://www.oracle.com/security-alerts/cpujan2022.html
af854a3a-2127-422b-91ae-364da2661108https://floqast.com/engineering-blog/post/fuzzing-and-parsing-securely/
af854a3a-2127-422b-91ae-364da2661108https://sheetjs.com/pro
af854a3a-2127-422b-91ae-364da2661108https://www.npmjs.com/package/xlsx/v/0.17.0
af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com/security-alerts/cpujan2022.html

Affected Packages

(2 across 2 ecosystems)

Maven(1)

Package	Vulnerable range	Fixed in	Dependents
org.webjars.npm:xlsx	0.12.11 ... 0.9.13 (19 versions)	0.17.0	—

npm(1)

Package	Vulnerable range	Fixed in	Dependents
xlsx	—	0.17.0	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-400Uncontrolled Resource Consumption (Denial of Service)

Data Freshness Timeline

(refreshed 8× in last 7d / 8× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:23 UTCEG score recompute
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-32012?

CVE-2021-32012 is a medium vulnerability published on July 19, 2021. SheetJS and SheetJS Pro through 0.16.9 allows attackers to cause a denial of service (memory consumption) via a crafted .xlsx document that is mishandled when read by xlsx.js (issue 1 of 2).

When was CVE-2021-32012 disclosed?

CVE-2021-32012 was first published in the National Vulnerability Database on July 19, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-32012 actively exploited?

CVE-2021-32012 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 43.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-32012?

CVE-2021-32012 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2021-32012?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-32012, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-32012

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