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Vulnerability record · CVE-2020-27216 · published 23 October 2020

CVE-2020-27216: Eclipse jetty vulnerability

Eclipse · Jetty

In Eclipse Jetty versions 1.0 thru 9.4.32.v20200930, 10.0.0.alpha1 thru 10.0.0.beta2, and 11.0.0.alpha1 thru 11.0.0.beta2O, on Unix like systems, the system's temporary directory is shared between all users on that system. A collocated user can observe the process of creating a temporary sub directory in the shared temporary directory and race to complete the creation of the temporary subdirectory. If the attacker wins the race then they will have read and write permission to the subdirectory used to unpack web applications, including their WEB-INF/lib jar files and JSP files. If any code is ever executed out of this temporary directory, this can lead to a local privilege escalation vulnerability.

7.0 CVSS 3.1 High EPSS 4.4% · top 9.1% CWE-378 · CWE-378CWE-379 · CWE-379
7.0CVSS 3.1 base score, v2 4.4
4.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
18Affected product versions listed by NVD
280References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

In Eclipse Jetty versions 1.0 thru 9.4.32.v20200930, 10.0.0.alpha1 thru 10.0.0.beta2, and 11.0.0.alpha1 thru 11.0.0.beta2O, on Unix like systems, the system's temporary directory is shared between all users on that system. A collocated user can observe the process of creating a temporary sub directory in the shared temporary directory and race to complete the creation of the temporary subdirectory. If the attacker wins the race then they will have read and write permission to the subdirectory used to unpack web applications, including their WEB-INF/lib jar files and JSP files. If any code is ever executed out of this temporary directory, this can lead to a local privilege escalation vulnerability.

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

Affected products

18 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugs.eclipse.org/bugs/show_bug.cgi?id=567921 ExploitPatchVendor Advisory
https://github.com/eclipse/jetty.project/security/advisories/GHSA-g3wg-6mcf-8jj6#advisory-comment-63053 ExploitMitigationThird Party Advisory
https://lists.apache.org/thread.html/r0259b14ae69b87821e27fed1f5333ea86018294fd31aab16b1fac84e%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r07525dc424ed69b3919618599e762f9ac03791490ca9d724f2241442%40%3Cdev.felix.apache.org
https://lists.apache.org/thread.html/r09b345099b4f88d2bed7f195a96145849243fb4e53661aa3bcf4c176%40%3Cissues.zookeeper.apa
https://lists.apache.org/thread.html/r0d7ad4f02c44d5d53a9ffcbca7ff4a8138241322da9c5c35b5429630%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r0d95e01f52667f44835c40f6dea72bb4397f33cd70a564ea74f3836d%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r0df8fe10fc36028cf6d0381ab66510917d0d68bc5ef7042001d03830%40%3Cdev.zookeeper.apache
https://lists.apache.org/thread.html/r0e9efe032cc65433251ee6470c66c334d4e7db9101e24cf91a3961f2%40%3Ccommits.directory.ap
https://lists.apache.org/thread.html/r0f5e9b93133ef3aaf31484bc3e15cc4b85f8af0fe4de2dacd9379d72%40%3Cdev.felix.apache.org
https://lists.apache.org/thread.html/r100c5c7586a23a19fdb54d8a32e17cd0944bdaa46277b35c397056f6%40%3Cnotifications.zookee
https://lists.apache.org/thread.html/r171846414347ec5fed38241a9f8a009bd2c89d902154c6102b1fb39a%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r185d10aae8161c08726f3ba9a1f1c47dfb97624ea6212fa217173204%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r18b6f10d9939419bae9c225d5058c97533cb376c9d6d0a0733ddd48d%40%3Cnotifications.zookee
https://lists.apache.org/thread.html/r19e8b338af511641d211ff45c43646fe1ae19dc9897d69939c09cabe%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r1d40368a309f9d835dcdd900249966e4fcbdf98c1cc4c84db2cd9964%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r1d45051310b11c6d6476f20d71b08ea97cb76846cbf61d196bac1c3f%40%3Cdev.zookeeper.apache
https://lists.apache.org/thread.html/r1dbb87c9255ecefadd8de514fa1d35c1d493c0527d7672cf40505d04%40%3Ccommits.zookeeper.ap
https://lists.apache.org/thread.html/r1ed79516bd6d248ea9f0e704dbfd7de740d5a75b71c7be8699fec824%40%3Cnotifications.zookee
https://lists.apache.org/thread.html/r1ef28b89ff0281c87ba3a7659058789bf28a99b8074191f1c3678db8%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r1fe31643fc34b4a33ae3d416d92c271aa97663f1782767d25e1d9ff8%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r2122537d3f9beb0ce59f44371a951b226406719919656ed000984bd0%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r279254a1bd6434c943da52000476f307e62b6910755387aeca1ec9a1%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r2aa316d008dab9ae48350b330d15dc1b863ea2a933558fbfc42b91a6%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r2d17b2a4803096ba427f3575599ea29b55f5cf9dbc1f12ba044cae1a%40%3Cnotifications.zookee
https://lists.apache.org/thread.html/r2e02700f7cfecb213de50be83e066086bea90278cd753db7fdc2ccff%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r2f732ee49d00610683ab5ddb4692ab25136b00bfd132ca3a590218a9%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r3042a9dd2973aa229e52d022df7813e4d74b67df73bfa6d97bb0caf8%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r336b1694a01858111e4625fb9ab2b07ad43a64a525cf6402e06aa6bf%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r351298dd39fc1ab63303be94b0c0d08acd72b17448e0346d7386189b%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r352e40ca9874d1beb4ad95403792adca7eb295e6bc3bd7b65fabcc21%40%3Ccommits.samza.apache
https://lists.apache.org/thread.html/r382870d6ccfd60533eb0d980688261723ed8a0704dafa691c4e9aa68%40%3Ccommits.iotdb.apache
https://lists.apache.org/thread.html/r3a763de620be72b6d74f46ec4bf39c9f35f8a0b39993212c0ac778ec%40%3Ccommits.zookeeper.ap
https://lists.apache.org/thread.html/r3b0ce1549a1ccdd7e51ec66daf8d54d46f1571edbda88ed09c96d7da%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r3e05ab0922876e74fea975d70af82b98580f4c14ba643c4f8a9e3a94%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r3f32cb4965239399c22497a0aabb015b28b2372d4897185a6ef0ccd7%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r407c316f6113dfc76f7bb3cb1693f08274c521064a92e5214197548e%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r4179c71908778cc0598ee8ee1eaed9b88fc5483c65373f45e087f650%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r44115ebfbf3b7d294d7a75f2d30bcc822dab186ebbcc2dce11915ca9%40%3Cissues.beam.apache.o
https://lists.apache.org/thread.html/r4946ffd86ad6eb7cb7863311235c914cb41232380de8d9dcdb3c115c%40%3Cissues.beam.apache.o

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Source: NIST National Vulnerability Database (record CVE-2020-27216), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.