How severe is CVE-2021-30638?

CVE-2021-30638 has a CVSS score of 7.5/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2021-30638?

CVE-2021-30638 affects the following packages: org.apache.tapestry:tapestry-core (Maven), org.apache.tapestry:tapestry-core (Maven). Ecosystems affected: Maven.

How do I fix CVE-2021-30638?

Update org.apache.tapestry:tapestry-core to 5.6.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-30638 is resolved across your whole dependency graph.

How do I detect CVE-2021-30638 in my Maven dependencies?

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

How do I mitigate CVE-2021-30638 if there is no patch (or I can't update yet)?

Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Is CVE-2021-30638 actively exploited in the wild?

No public exploit code has been indexed for CVE-2021-30638 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-2021-30638?

CVE-2021-30638 has an EPSS (Exploit Prediction Scoring System) score of 6.6%, placing it in the 94th 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-2021-30638?

CVE-2021-30638 is classified as Information Exposure (CWE-200), CWE-863 (CWE-863). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2021-30638 published, and has it been updated?

CVE-2021-30638 was published on April 27, 2021 and was last updated on July 9, 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

Not in CISA KEV

HIGH severity

CVE-2021-30638 — tapestry-core

HIGH

CVE-2021-30638 is a high-severity (CVSS 7.5) Information Exposure vulnerability in org.apache.tapestry:tapestry-core. A fix is available for org.apache.tapestry:tapestry-core — see the affected versions and patch details below.

Information Exposure in Apache Tapestry

Also known asGHSA-ghm8-mmx7-xvg2

Published

Apr 27, 2021

Updated

Jul 9, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

6.6%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs94th percentile — riskier than 94% of all scored CVEsHighest risk

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

How urgent is this, really

CVE-2021-30638 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 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

☕org.apache.tapestry:tapestry-core☕org.apache.tapestry:tapestry-core

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Information Exposure vulnerability in context asset handling of Apache Tapestry allows an attacker to download files inside WEB-INF if using a specially-constructed URL. This was caused by an incomplete fix for CVE-2020-13953. This issue affects Apache Tapestry Apache Tapestry 5.4.0 version to Apache Tapestry 5.6.3; Apache Tapestry 5.7.0 version and Apache Tapestry 5.7.1.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.apache.tapestry:tapestry-core`	≥ 5.4.0&&< 5.6.4	5.6.4`org.apache.tapestry:tapestry-core:5.6.4`
☕Maven	`org.apache.tapestry:tapestry-core`	≥ 5.7.0&&< 5.7.2	5.7.2`org.apache.tapestry:tapestry-core:5.7.2`

Affected Products

1 product · 2 configurations

Application

tapestryapache

≥ 5.7.0 && < 5.7.2

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.apache.tapestry:tapestry-core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.apache.tapestry:tapestry-core to 5.6.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-30638 is resolved across your whole dependency graph.
Workarounds
Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2021-30638 in your dependencies?

Find it across Maven, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

7.5/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Raw vector

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

CWE Classification

CWE-200Information Exposure CWE-863CWE-863

Weaponization

No known public exploit tooling found.

Timeline

Disclosed

Apr 27, 2021

Last updated

Jul 9, 2026

Identifiers

CVE-2021-30638

GHSA-ghm8-mmx7-xvg2

References

Advisoryopenwall.com Advisorylists.apache.org Advisorysecurity.netapp.com Advisoryzerodayinitiative.com Advisorynvd.nist.gov Websecurity.netapp.com Webzerodayinitiative.com

Related vulnerabilities

This CVE is high severity; 7 of 8 other CVEs affecting tapestry-core are rated as high or higher (top: critical).

CVE-2022-46366CVE-2022-31781CVE-2019-0195CVE-2014-1972CVE-2020-13953CVE-2021-27850CVE-2019-0207CVE-2019-10071

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedJul 9, 2026

CVE-2021-30638 — tapestry-core

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-2021-30638 in your dependencies?