How severe is CVE-2021-32013?

CVE-2021-32013 has a CVSS score of 5.5/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2021-32013?

CVE-2021-32013 affects the following packages: org.webjars.npm:xlsx (Maven), xlsx (npm). Ecosystems affected: Maven, npm.

How do I fix CVE-2021-32013?

Update org.webjars.npm:xlsx to 0.17.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-32013 is resolved across your whole dependency graph.

How do I detect CVE-2021-32013 in my Maven, npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.webjars.npm:xlsx, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2021-32013 if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Is CVE-2021-32013 actively exploited in the wild?

No public exploit code has been indexed for CVE-2021-32013 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2021-32013?

CVE-2021-32013 has an EPSS (Exploit Prediction Scoring System) score of 0.9%, placing it in the 58th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2021-32013?

CVE-2021-32013 is classified as Uncontrolled Resource Consumption (CWE-400). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2021-32013 published, and has it been updated?

CVE-2021-32013 was published on July 22, 2021 and was last updated on September 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven📦 npm

Not in CISA KEV

MEDIUM severity

CVE-2021-32013 — xlsx

MEDIUM

CVE-2021-32013 is a medium-severity (CVSS 5.5) Uncontrolled Resource Consumption vulnerability in org.webjars.npm:xlsx. A fix is available for org.webjars.npm:xlsx — see the affected versions and patch details below.

Denial of Service in SheetsJS Pro

Published

Jul 22, 2021

Updated

Sep 10, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.9%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs58th percentile — riskier than 58% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-32013 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

2 pkgs affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

7Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream

xlsxnpm

12.8Mdownloads / week

Description

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 2 of 2).

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.webjars.npm:xlsx`	all versions	0.17.0`org.webjars.npm:xlsx:0.17.0`
📦npm	`xlsx`	all versions	0.17.0`npm install xlsx@0.17.0`

Affected Products

3 products · 3 configurations

Application

rest data servicesoracle

< 21.2.4

range

Application

sheetjssheetjs_project

≤ 0.16.9

range

Application

sheetjs prosheetjs_project

≤ 0.16.9

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.webjars.npm:xlsx, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.webjars.npm:xlsx to 0.17.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-32013 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

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 2 of 2).

O3 Security · Impact-Aware SCA

Is CVE-2021-32013 in your dependencies?

Find it across Maven, npm, including transitive dependencies.

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CVSS Score

5.5/10CVSS v3 base

Vector breakdown

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Raw vector

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

CWE Classification

CWE-400Uncontrolled Resource Consumption

Weaponization

No known public exploit tooling found.

Timeline

Disclosed

Jul 22, 2021

Last updated

Sep 10, 2026

Identifiers

CVE-2021-32013

References

Advisorynvd.nist.gov Webfloqast.com Websheetjs.com Webnpmjs.com Weboracle.com

Related vulnerabilities

Also affects xlsx

This CVE is medium severity, in line with the other 2 CVEs affecting xlsx.

CVE-2021-32012CVE-2021-32014

Also affects xlsx

This CVE is medium severity; 2 of 2 other CVEs affecting xlsx are rated as high or higher (top: high).

CVE-2024-22363CVE-2023-30533

Same weakness: CWE-400

This CVE is medium severity; 4 of 4 other CVEs with CWE-400 are rated as high or higher (top: high).

CVE-2026-33625CVE-2026-81875CVE-2026-68537CVE-2026-85721Browse all CWE-400

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedSep 10, 2026

CVE-2021-32013 — xlsx

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Frequently Asked Questions

Is CVE-2021-32013 in your dependencies?