CVE-2021-21290Local Information Disclosure Vulnerability in Netty on Unix-Like systems due temporary files
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.2 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-378, CWE-379
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Modified
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
netty netty netty:netty (from the name) | before 4.1.59.Final | CNA record |
netty netty netty:netty | before 4.1.59 | NVD |
debian debian_linux debian:debian_linux | 9.0; 10.0 | NVD |
quarkus quarkus quarkus:quarkus | through 1.13.7 | NVD |
oracle banking_corporate_lending_process_management oracle:banking_corporate_lending_process_management | 14.2.0; 14.3.0; 14.5.0 | NVD |
oracle banking_credit_facilities_process_management oracle:banking_credit_facilities_process_management | 14.2.0; 14.3.0; 14.5.0 | NVD |
oracle banking_trade_finance_process_management oracle:banking_trade_finance_process_management | 14.2.0; 14.3.0; 14.5.0 | NVD |
oracle communications_brm_-_elastic_charging_engine oracle:communications_brm_-_elastic_charging_engine | 12.0.0.3 | NVD |
oracle communications_design_studio oracle:communications_design_studio | 7.4.2 | NVD |
oracle communications_messaging_server oracle:communications_messaging_server | 8.1 | NVD |
oracle nosql_database oracle:nosql_database | before 20.3 | NVD |
netapp active_iq_unified_manager netapp:active_iq_unified_manager | all versions; all versions | NVD |
netapp cloud_secure_agent netapp:cloud_secure_agent | all versions | NVD |
netapp snapcenter netapp:snapcenter | all versions | NVD |
References
- https://github.com/netty/netty/security/advisories/GHSA-5mcr-gq6c-3hq2x-refsource-confirm
- https://github.com/netty/netty/commit/c735357bf29d07856ad171c6611a2e1a0e0000ecx-refsource-misc
- https://lists.debian.org/debian-lts-announce/2021/02/msg00016.htmlmailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rc488f80094872ad925f0c73d283d4c00d32def81977438e27a3dc2bb%40%3Cjira.kafka.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r2748097ea4b774292539cf3de6e3b267fc7a88d6c8ec40f4e2e87bd4%40%3Cdev.kafka.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/ra503756ced78fdc2136bd33e87cb7553028645b261b1f5c6186a121e%40%3Cjira.kafka.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r10308b625e49d4e9491d7e079606ca0df2f0a4d828f1ad1da64ba47b%40%3Cjira.kafka.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r2fda4dab73097051977f2ab818f75e04fbcb15bb1003c8530eac1059%40%3Cjira.kafka.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r326ec431f06eab7cb7113a7a338e59731b8d556d05258457f12bac1b%40%3Cdev.kafka.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rdba4f78ac55f803893a1a2265181595e79e3aa027e2e651dfba98c18%40%3Cjira.kafka.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r0857b613604c696bf9743f0af047360baaded48b1c75cf6945a083c5%40%3Cjira.kafka.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r5e4a540089760c8ecc2c411309d74264f1dad634ad93ad583ca16214%40%3Ccommits.kafka.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r71dbb66747ff537640bb91eb0b2b24edef21ac07728097016f58b01f%40%3Ccommits.kafka.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/ra0fc2b4553dd7aaf75febb61052b7f1243ac3a180a71c01f29093013%40%3Cjira.kafka.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r5bf303d7c04da78f276765da08559fdc62420f1df539b277ca31f63b%40%3Cissues.zookeeper.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r743149dcc8db1de473e6bff0b3ddf10140a7357bc2add75f7d1fbb12%40%3Cdev.zookeeper.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r4efed2c501681cb2e8d629da16e48d9eac429624fd4c9a8c6b8e7020%40%3Cdev.tinkerpop.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r02e467123d45006a1dda20a38349e9c74c3a4b53e2e07be0939ecb3f%40%3Cdev.ranger.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r7bb3cdc192e9a6f863d3ea05422f09fa1ae2b88d4663e63696ee7ef5%40%3Cdev.ranger.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rcd163e421273e8dca1c71ea298dce3dd11b41d51c3a812e0394e6a5d%40%3Ccommits.pulsar.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r9924ef9357537722b28d04c98a189750b80694a19754e5057c34ca48%40%3Ccommits.pulsar.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rb51d6202ff1a773f96eaa694b7da4ad3f44922c40b3d4e1a19c2f325%40%3Ccommits.pulsar.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r790c2926efcd062067eb18fde2486527596d7275381cfaff2f7b3890%40%3Cissues.bookkeeper.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r1908a34b9cc7120e5c19968a116ddbcffea5e9deb76c2be4fa461904%40%3Cdev.zookeeper.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rb06c1e766aa45ee422e8261a8249b561784186483e8f742ea627bda4%40%3Cdev.kafka.apache.org%3Emailing-list, x-refsource-mlist
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.