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Δ / VULNERABILITY RECORD

CVE-2021-21290.

Source-reported disclosure and enrichment record.

SEVERITY / CVSSMEDIUM / 5.5CVSS 3.1 · nvd@nist.gov
EXPLOITATION STATUSNot listed in the cached KEV catalogThis does not establish absence of exploitation.
RECORD STATUSModifiedModified Oct 08, 2026

Disclosure summary

Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In Netty before version 4.1.59.Final there is a vulnerability on Unix-like systems involving an insecure temp file. When netty's multipart decoders are used local information disclosure can occur via the local system temporary directory if temporary storing uploads on the disk is enabled. On unix-like systems, the temporary directory is shared between all user. As such, writing to this directory using APIs that do not explicitly set the file/directory permissions can lead to information disclosure. Of note, this does not impact modern MacOS Operating Systems. The method "File.createTempFile" on unix-like systems creates a random file, but, by default will create this file with the permissions "-rw-r--r--". Thus, if sensitive information is written to this file, other local users can read this information. This is the case in netty's "AbstractDiskHttpData" is vulnerable. This has been fixed in version 4.1.59.Final. As a workaround, one may specify your own "java.io.tmpdir" when you start the JVM or use "DefaultHttpDataFactory.setBaseDir(...)" to set the directory to something that is only readable by the current user.

Source-reported weakness categories

CWE-378, CWE-379, CWE-668

Source-specific records & product guidance

Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.

NIST National Vulnerability Database · NVD-CVE-2021-21290

Open original source · Updated Oct 08, 2026

Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.

VendorProduct / associationVersion / bounds
nettynetty* {"versionEndExcluding":"4.1.59"}
debiandebian_linux9.0
debiandebian_linux10.0
quarkusquarkus* {"versionEndIncluding":"1.13.7"}
oraclebanking_corporate_lending_process_management14.2.0
oraclebanking_corporate_lending_process_management14.3.0
oraclebanking_corporate_lending_process_management14.5.0
oraclebanking_credit_facilities_process_management14.2.0
oraclebanking_credit_facilities_process_management14.3.0
oraclebanking_credit_facilities_process_management14.5.0
oraclebanking_trade_finance_process_management14.2.0
oraclebanking_trade_finance_process_management14.3.0
oraclebanking_trade_finance_process_management14.5.0
oraclecommunications_brm_-_elastic_charging_engine12.0.0.3
oraclecommunications_design_studio7.4.2
oraclecommunications_messaging_server8.1
oraclenosql_database* {"versionEndExcluding":"20.3"}
netappactive_iq_unified_manager-
netappactive_iq_unified_manager-
netappcloud_secure_agent-
netappsnapcenter-

Original records & references

PUBLISHED 2021-02-08T15:15:12-05:00
MODIFIED 2026-10-08T18:17:04-04:00
INGESTED 2026-10-10T20:50:19-04:00