CVE-2021-30638Network attack vector

Protected file disclosure via backslash filter bypass

Published Apr 27, 2021 · Updated Aug 3, 2024

Information disclosure in Apache Tapestry 5.4.0 through 5.6.3 and 5.7.0 through 5.7.1 allows remote attackers to download protected web files. The ContextAssetRequestHandler path filter screens forward-slash forms but fails to normalize backslashes before checking for WEB-INF and META-INF. No authentication or user interaction is required; crafted context-asset URLs expose files within those protected directories.

CVSS severity7.5
High
EPSS probability6.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Apache Tapestry 5.4.0 through 5.6.3 and 5.7.0 through 5.7.1 allows remote attackers to download protected web files. The ContextAssetRequestHandler path filter screens forward-slash forms but fails to normalize backslashes before checking for WEB-INF and META-INF. No authentication or user interaction is required; crafted context-asset URLs expose files within those protected directories.

The record

CVE
CVE-2021-30638
Published
Apr 27, 2021
Updated
Aug 3, 2024
Vendor
The Apache Software Foundation
Product
Apache Tapestry
Classifications
CWE-863, CWE-200, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 27, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Apache Tapestry <Apache Tapestry 5.6.4
  2. Affected versionversion=Apache Tapestry <Apache Tapestry 5.7.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Tapestryversion=Apache Tapestry <Apache Tapestry 5.6.4; version=Apache Tapestry <Apache Tapestry 5.7.2

Published CVSS scores

5.0NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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