Local Information Disclosure Vulnerability in Netty on Unix-Like systems due temporary files

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Summary

CVECVE-2021-21290
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-02-08 20:15:12 UTC
Updated2026-10-08 22:17:04 UTC
DescriptionNetty 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

EPSS: 0.017770000 probability, percentile 0.776090000 (date 2026-10-11)

Problem Types: CWE-378 | CWE-379 | CWE-668 | CWE-378 CWE-378: Creation of Temporary File With Insecure Permissions | CWE-379 CWE-379: Creation of Temporary File in Directory with Insecure Permissions

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
3.1[email protected]Secondary6.2MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED6.2MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
2.0[email protected]Primary1.9AV:L/AC:M/Au:N/C:P/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

CVSS v2.0 Breakdown

Access Vector
Local
Access Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None

AV:L/AC:M/Au:N/C:P/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 10.0 All All All
Operating System Debian Debian Linux 9.0 All All All
Application Netapp Active Iq Unified Manager - All All All
Application Netapp Active Iq Unified Manager - All All All
Application Netapp Cloud Secure Agent - All All All
Application Netapp Snapcenter - All All All
Application Netty Netty All All All All
Application Oracle Banking Corporate Lending Process Management 14.2.0 All All All
Application Oracle Banking Corporate Lending Process Management 14.3.0 All All All
Application Oracle Banking Corporate Lending Process Management 14.5.0 All All All
Application Oracle Banking Credit Facilities Process Management 14.2.0 All All All
Application Oracle Banking Credit Facilities Process Management 14.3.0 All All All
Application Oracle Banking Credit Facilities Process Management 14.5.0 All All All
Application Oracle Banking Trade Finance Process Management 14.2.0 All All All
Application Oracle Banking Trade Finance Process Management 14.3.0 All All All
Application Oracle Banking Trade Finance Process Management 14.5.0 All All All
Application Oracle Communications Brm - Elastic Charging Engine 12.0.0.3 All All All
Application Oracle Communications Design Studio 7.4.2 All All All
Application Oracle Communications Messaging Server 8.1 All All All
Application Oracle Nosql Database All All All All
Application Quarkus Quarkus All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Netty Netty affected < 4.1.59.Final Not specified

References

ReferenceSourceLinkTags
lists.apache.org/thread.html/r2fda4dab73097051977f2ab818f75e04fbcb15bb1003c853... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/r02e467123d45006a1dda20a38349e9c74c3a4b53e2e07be0... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/r5c701840aa2845191721e39821445e1e8c59711e71942b77... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/r5e66e286afb5506cdfe9bbf68a323e8d09614f6d1ddc806e... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Oracle Critical Patch Update Advisory - April 2022 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Patch, Third Party Advisory
lists.apache.org/thread.html/r743149dcc8db1de473e6bff0b3ddf10140a7357bc2add75f... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/rb592033a2462548d061a83ac9449c5ff66098751748fcd1e... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Oracle Critical Patch Update Advisory - October 2021 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Patch, Third Party Advisory
lists.apache.org/thread.html/r71dbb66747ff537640bb91eb0b2b24edef21ac0772809701... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Oracle Critical Patch Update Advisory - July 2021 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Third Party Advisory
lists.apache.org/thread.html/r59bac5c09f7a4179b9e2460e8f41c278aaf3b9a21cc23678... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/rcd163e421273e8dca1c71ea298dce3dd11b41d51c3a812e0... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/r1908a34b9cc7120e5c19968a116ddbcffea5e9deb76c2be4... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/rb06c1e766aa45ee422e8261a8249b561784186483e8f742e... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/r584cf871f188c406d8bd447ff4e2fd9817fca862436c064d... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/r2936730ef0a06e724b96539bc7eacfcd3628987c16b1b99c... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Use Files.createTempFile(...) to ensure the file is created with prop… · netty/netty@c735357 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch, Third Party Advisory
CVE-2021-21290 Apache Netty Vulnerability in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
lists.apache.org/thread.html/r0857b613604c696bf9743f0af047360baaded48b1c75cf69... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/r2748097ea4b774292539cf3de6e3b267fc7a88d6c8ec40f4... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/r9924ef9357537722b28d04c98a189750b80694a19754e505... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Oracle Critical Patch Update Advisory - April 2021 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Patch, Third Party Advisory
Debian -- Security Information -- DSA-4885-1 netty af854a3a-2127-422b-91ae-364da2661108 www.debian.org Third Party Advisory
lists.apache.org/thread.html/r790c2926efcd062067eb18fde2486527596d7275381cfaff... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/r10308b625e49d4e9491d7e079606ca0df2f0a4d828f1ad1d... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/ra503756ced78fdc2136bd33e87cb7553028645b261b1f5c6... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/r4efed2c501681cb2e8d629da16e48d9eac429624fd4c9a8c... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/rc488f80094872ad925f0c73d283d4c00d32def81977438e2... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/ra0fc2b4553dd7aaf75febb61052b7f1243ac3a180a71c01f... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/r5e4a540089760c8ecc2c411309d74264f1dad634ad93ad58... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/r0053443ce19ff125981559f8c51cf66e3ab4350f47812b8c... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Local Information Disclosure Vulnerability in Netty on Unix-Like systems due temporary files · Advisory · netty/netty · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Exploit, Third Party Advisory
lists.apache.org/thread.html/r5bf303d7c04da78f276765da08559fdc62420f1df539b277... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
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[SECURITY] [DLA 2555-1] netty security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
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Legacy QID Mappings

  • 178527 Debian Security Update for netty (DSA 4885-1)
  • 180593 Debian Security Update for netty (CVE-2021-21290)
  • 199574 Ubuntu Security Notification for Netty Vulnerabilities (USN-6049-1)
  • 239353 Red Hat Update for Red Hat JBoss Enterprise Application Platform 7.3.7 (RHSA-2021:2048)
  • 239354 Red Hat Update for Red Hat JBoss Enterprise Application Platform 7.3.7 (RHSA-2021:2047)
  • 239355 Red Hat Update for Red Hat JBoss Enterprise Application Platform 7.3.7 (RHSA-2021:2046)
  • 239741 Red Hat Update for amq clients 2.9.1 release and (RHSA-2021:1511)
  • 240012 Red Hat Update for Satellite "6\\.10" (RHSA-2022:0190)
  • 240566 Red Hat Update for Satellite 6.11 Release (RHSA-2022:5498)
  • 375720 Oracle PeopleSoft Enterprise PeopleTools Product Multiple Vulnerabilities (CPUJUL2021)
  • 960505 Rocky Linux Security Update for Satellite (RLSA-2022:5498)
  • 980333 Java (maven) Security Update for io.netty:netty-codec-http (GHSA-5mcr-gq6c-3hq2)

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