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OpenAdvisories
Medium · 5.2 Public exploit CVE-2020-27223 BIT-nifi-2020-27223BIT-solr-2020-27223BIT-spark-2020-27223EUVD-2021-0679GHSA-m394-8rww-3jr7

DOS vulnerability for Quoted Quality CSV headers

Published Feb 26, 2021 · Updated Aug 20, 2025 · Assigned by eclipse

Vendor: The Eclipse Foundation Product: Eclipse Jetty Package: jetty9 Package: jetty9 Package: org.eclipse.jetty:jetty-server Ecosystem: Debian Ecosystem: Maven Ecosystem: Ubuntu

Description

In Eclipse Jetty 9.4.6.v20170531 to 9.4.36.v20210114 (inclusive), 10.0.0, and 11.0.0 when Jetty handles a request containing multiple Accept headers with a large number of “quality” (i.e. q) parameters, the server may enter a denial of service (DoS) state due to high CPU usage processing those quality values, resulting in minutes of CPU time exhausted processing those quality values.

Affected products

VendorProductAffectedFixed
The Eclipse Foundation Eclipse Jetty 9.4.6.v20170531 – < unspecified, unspecified – ≤ 9.4.36.v20210114, 10.0.0, 11.0.0 unspecified

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 jetty9 9.4.38-1 —
Debian 13 jetty9 9.4.38-1 —
Debian 12 jetty9 9.4.38-1 —
Debian 10 jetty9 9.4.16-0+deb10u1 DSA-4949-1

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 22.04 LTS jetty9 No fix yet —
Ubuntu 20.04 LTS jetty9 No fix yet —
Ubuntu 18.04 LTS jetty9 No fix yet —
Ubuntu 16.04 LTS jetty9 No fix yet —

Red Hat

Security tracker ↗
ReleasePackageFixed inAdvisory
Red Hat OpenShift 4 jenkins 2.277.3.1623846768-1.el7 RHSA-2021:2499, RHSA-2021:2431
Red Hat OpenShift 4 jenkins-2-plugins 4.5.1623326336-1.el7 RHSA-2021:2431
Red Hat OpenShift 3 jenkins 2.289.1.1624365627-1.el7 RHSA-2021:2517
Red Hat OpenShift 3 jenkins-2-plugins 3.11.1624366838-1.el7 RHSA-2021:2517

SUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
SLES 15 SP2 jetty-minimal 9.4.38-3.6.2 SUSE-SU-2021:0940-1

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 2 repositories

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Affected packages

EcosystemPackageAffectedFixedRecord
Maven org.eclipse.jetty:jetty-server >= 9.4.6, < 9.4.37 9.4.37 GHSA-m394-8rww-3jr7
Maven org.eclipse.jetty:jetty-server >= 10.0.0, < 10.0.1 10.0.1 GHSA-m394-8rww-3jr7
Maven org.eclipse.jetty:jetty-server >= 11.0.0, < 11.0.1 11.0.1 GHSA-m394-8rww-3jr7

Advisories 6

References