CVE-2021-21290

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

MEDIUM 6.2

En bref

Source: NVD
EPSS: EPSS 1.78 % · centile 78 (2026-10-28)
État: PUBLISHED
Publiée: 2021-02-08 20:10 UTC
Mise à jour: 2026-10-08 21:14 UTC
Attribuée par: GitHub_M
Statut NVD: Modified

Description

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.

Faiblesses (CWE)

CWE-378 — Création d'un fichier temporaire aux permissions non sécurisées
CWE-379 — Creation of Temporary File in Directory with Insecure Permissions
CWE-668 — Exposition d'une ressource à la mauvaise sphère

Références

Scores

Version	Score	Vecteur	Évalué par
CVSS 3.1	MEDIUM 6.2	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	GitHub_M
CVSS 3.1	MEDIUM 6.2	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	NVD · security-advisories@github.com (Secondary)
CVSS 3.1	MEDIUM 5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	NVD · nvd@nist.gov (Primary)
CVSS 2.0	LOW 1.9	AV:L/AC:M/Au:N/C:P/I:N/A:N	NVD · nvd@nist.gov (Primary)

Avis

GHSA-5mcr-gq6c-3hq2 — Local Information Disclosure Vulnerability in Netty on Unix-Like systems

Références européennes

ENISA EUVD · EUVD-2021-0535
GCVE · GCVE-0-2021-21290

Avis du CERT-FR

CERTFR-2026-AVI-1165 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
CERTFR-2026-AVI-0500 — Multiples vulnérabilités dans VMware Tanzu · cert.ssi.gouv.fr
CERTFR-2025-AVI-0760 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
CERTFR-2025-AVI-0661 — Multiples vulnérabilités dans les produits Splunk · cert.ssi.gouv.fr
CERTFR-2025-AVI-0106 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
CERTFR-2025-AVI-0021 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
CERTFR-2024-AVI-0031 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
CERTFR-2023-AVI-0276 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
CERTFR-2021-AVI-951 — Multiples vulnérabilités dans le noyau Linux de RedHat · cert.ssi.gouv.fr
CERTFR-2021-AVI-559 — Multiples vulnérabilités dans Oracle PeopleSoft · cert.ssi.gouv.fr
CERTFR-2021-AVI-474 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
CERTFR-2021-AVI-407 — Multiples vulnérabilités dans le noyau Linux de Red Hat · cert.ssi.gouv.fr

Configurations affectées (CPE NVD)

cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:* < 4.1.59
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:a:quarkus:quarkus:*:*:*:*:*:*:*:* ≤ 1.13.7
cpe:2.3:a:oracle:banking_corporate_lending_process_management:14.2.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_corporate_lending_process_management:14.3.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_corporate_lending_process_management:14.5.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_credit_facilities_process_management:14.2.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_credit_facilities_process_management:14.3.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_credit_facilities_process_management:14.5.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_trade_finance_process_management:14.2.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_trade_finance_process_management:14.3.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_trade_finance_process_management:14.5.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_brm_-_elastic_charging_engine:12.0.0.3:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_design_studio:7.4.2:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_messaging_server:8.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:nosql_database:*:*:*:*:*:*:*:* < 20.3
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:linux:*:*
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:windows:*:*
cpe:2.3:a:netapp:cloud_secure_agent:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:snapcenter:-:*:*:*:*:*:*:*

Produits affectés

Produit	Versions
netty · netty	affected < 4.1.59.Final

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD