GHSA-5mcr-gq6c-3hq2 · Severity: medium · Ecosystem: maven — Local Information Disclosure Vulnerability in Netty on Unix-Like systems
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.
Conclusion & alert: CVE-2021-21290 is rated High Exploit Risk (67.9/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.78%). Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.75% over the last day, indicating growing attacker interest. Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.02% | 1.78% | +1.75% |
| 2 | 2025-11-21 | 0.07% | 0.02% | -0.05% |
| 3 | 2025-11-18 | — | 0.07% | — |
Full EPSS history (15 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 6.2 | 3.1 | MEDIUM |
|
2.5 | 3.6 | [email protected] |
| 5.5 | 3.1 | MEDIUM |
|
1.8 | 3.6 | [email protected] |
| 1.9 | 2.0 | LOW |
|
3.4 | 2.9 | [email protected] |
GHSA-5mcr-gq6c-3hq2 · Severity: medium · Ecosystem: maven — Local Information Disclosure Vulnerability in Netty on Unix-Like systems
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2021-21290 not yet assigned priority: Debian including 1 source packages (netty), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2021-21290 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2021-21290 |
suse
|
medium | CVE-2021-21290 severity moderate: SUSE including 242 source package names (5.0.0-beta1.2.122:netty-4.1.75-150200.4.6.2, 5.1.0.6.40:netty-4.1.75-150200.4.6.2, …), 262 product×package rows across 28 product lines (Container suse/manager/5.0/x86_64/server, Container suse/multi-linux-manager/5.1/x86_64/server, … (28 product lines)): Known Affected 231, Fixed 31. | https://www.suse.com/security/cve/CVE-2021-21290/ |
ubuntu
|
medium | CVE-2021-21290 medium priority: Ubuntu including 1 source packages (netty), 16 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): released 11, ignored 4, needs-triage 1. | https://ubuntu.com/security/CVE-2021-21290 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| netty | netty | < 4.1.59 | cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:* |
| debian | debian_linux | 9.0 | cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* |
| debian | debian_linux | 10.0 | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* |
| quarkus | quarkus | <= 1.13.7 | cpe:2.3:a:quarkus:quarkus:*:*:*:*:*:*:*:* |
| oracle | banking_corporate_lending_process_management | 14.2.0 | cpe:2.3:a:oracle:banking_corporate_lending_process_management:14.2.0:*:*:*:*:*:*:* |
| oracle | banking_corporate_lending_process_management | 14.3.0 | cpe:2.3:a:oracle:banking_corporate_lending_process_management:14.3.0:*:*:*:*:*:*:* |
| oracle | banking_corporate_lending_process_management | 14.5.0 | cpe:2.3:a:oracle:banking_corporate_lending_process_management:14.5.0:*:*:*:*:*:*:* |
| oracle | banking_credit_facilities_process_management | 14.2.0 | cpe:2.3:a:oracle:banking_credit_facilities_process_management:14.2.0:*:*:*:*:*:*:* |
| oracle | banking_credit_facilities_process_management | 14.3.0 | cpe:2.3:a:oracle:banking_credit_facilities_process_management:14.3.0:*:*:*:*:*:*:* |
| oracle | banking_credit_facilities_process_management | 14.5.0 | cpe:2.3:a:oracle:banking_credit_facilities_process_management:14.5.0:*:*:*:*:*:*:* |
| oracle | banking_trade_finance_process_management | 14.2.0 | cpe:2.3:a:oracle:banking_trade_finance_process_management:14.2.0:*:*:*:*:*:*:* |
| oracle | banking_trade_finance_process_management | 14.3.0 | cpe:2.3:a:oracle:banking_trade_finance_process_management:14.3.0:*:*:*:*:*:*:* |
| oracle | banking_trade_finance_process_management | 14.5.0 | cpe:2.3:a:oracle:banking_trade_finance_process_management:14.5.0:*:*:*:*:*:*:* |
| oracle | communications_brm_-_elastic_charging_engine | 12.0.0.3 | cpe:2.3:a:oracle:communications_brm_-_elastic_charging_engine:12.0.0.3:*:*:*:*:*:*:* |
| oracle | communications_design_studio | 7.4.2 | cpe:2.3:a:oracle:communications_design_studio:7.4.2:*:*:*:*:*:*:* |
| oracle | communications_messaging_server | 8.1 | cpe:2.3:a:oracle:communications_messaging_server:8.1:*:*:*:*:*:*:* |
| oracle | nosql_database | < 20.3 | cpe:2.3:a:oracle:nosql_database:*:*:*:*:*:*:*:* |
| netapp | active_iq_unified_manager | — | cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:linux:*:* |
| netapp | active_iq_unified_manager | — | cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:windows:*:* |
| netapp | cloud_secure_agent | — | cpe:2.3:a:netapp:cloud_secure_agent:-:*:*:*:*:*:*:* |
| netapp | snapcenter | — | cpe:2.3:a:netapp:snapcenter:-:*:*:*:*:*:*:* |