Information disclosure in JUnit4

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Summary

CVECVE-2020-15250
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-10-12 18:15:13 UTC
Updated2026-10-07 21:17:02 UTC
DescriptionIn JUnit4 from version 4.7 and before 4.13.1, the test rule TemporaryFolder contains a local information disclosure vulnerability. On Unix like systems, the system's temporary directory is shared between all users on that system. Because of this, when files and directories are written into this directory they are, by default, readable by other users on that same system. This vulnerability does not allow other users to overwrite the contents of these directories or files. This is purely an information disclosure vulnerability. This vulnerability impacts you if the JUnit tests write sensitive information, like API keys or passwords, into the temporary folder, and the JUnit tests execute in an environment where the OS has other untrusted users. Because certain JDK file system APIs were only added in JDK 1.7, this this fix is dependent upon the version of the JDK you are using. For Java 1.7 and higher users: this vulnerability is fixed in 4.13.1. For Java 1.6 and lower users: no patch is available, you must use the workaround below. If you are unable to patch, or are stuck running on Java 1.6, specifying the `java.io.tmpdir` system environment variable to a directory that is exclusively owned by the executing user will fix this vulnerability. For more information, including an example of vulnerable code, see the referenced GitHub Security Advisory.

Risk And Classification

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

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

EPSS: 0.016950000 probability, percentile 0.764210000 (date 2026-10-07)

Problem Types: CWE-200 | CWE-732 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
3.1[email protected]Secondary4.4MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N
3.1CNADECLARED4.4MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:R/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
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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
Application Apache Pluto All All All All
Operating System Debian Debian Linux 9.0 All All All
Application Junit Junit4 All All All All
Application Oracle Communications Cloud Native Core Policy 1.14.0 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Junit-team Junit4 affected < 4.13.1 Not specified

References

ReferenceSourceLinkTags
lists.apache.org/thread.html/r30f502d2f79e8d635361adb8108dcbb73095163fcbd776ee... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
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junit4/ReleaseNotes4.13.1.md at 7852b90cfe1cea1e0cdaa19d490c83f0d8684b50 · junit-team/junit4 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Release Notes, Third Party Advisory
lists.apache.org/thread.html/r8b02dc6f18df11ff39eedb3038f1e31e6f90a779b1959bae... 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
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
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TemporaryFolder (JUnit API) af854a3a-2127-422b-91ae-364da2661108 junit.org Vendor Advisory
lists.apache.org/thread.html/rdef7d1380c86e7c0edf8a0f89a2a8db86fce5e363457d56b... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
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Merge pull request from GHSA-269g-pwp5-87pp · junit-team/junit4@610155b · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch, Third Party Advisory
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[SECURITY] [DLA 2426-1] junit4 security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
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lists.apache.org/thread.html/r925eaae7dd8f77dd61eefc49c1fcf54bd9ecfe605486870d... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/rdbdd30510a7c4d0908fd22075c02b75bbc2e0d977ec22249... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
CVE-2020-15250 doesn't affect versions prior to 4.7 but claims it did · Issue #1676 · junit-team/junit4 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Issue Tracking, Third Party Advisory
lists.apache.org/thread.html/raebf13f53cd5d23d990712e3d11c80da9a7bae94a6284050... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
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lists.apache.org/thread.html/reb700e60b9642eafa4b7922bfee80796394135aa09c7a239... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
TemporaryFolder on unix-like systems does not limit access to created files · Advisory · junit-team/junit4 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Exploit, Third Party Advisory
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Legacy QID Mappings

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  • 501589 Alpine Linux Security Update for junit
  • 670270 EulerOS Security Update for junit (EulerOS-SA-2021-1807)
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  • 980062 Java (maven) Security Update for junit:junit (GHSA-269g-pwp5-87pp)

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