CVE-2020-27223
A public proof of concept exists; no exploitation attested.
- Published2021-02-26
- Fixed in9.4.36
- WeaknessCWE-400 · CWE-407
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTC- 2021-02-2622:15CVE publishedNVD
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
- 2026-10-2319:23EPSS crossed 10 %FIRST EPSS
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-27223?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-27223?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 9.4 | ≥ 9.4.7, < 9.4.36 | 9.4.36 | NVD |
| 9.4 | = 9.4.6 | no fix published | NVD |
| 9.4 | = 9.4.36 | no fix published | NVD |
| 10.0 | = 10.0.0 | no fix published | NVD |
| 11.0 | = 11.0.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 1.13 | = 1.13.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 8.8 | = 8.8.1 | no fix published | NVD |
13 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Eclipse jetty to 9.4.36
Advisories and patches
- bugs.eclipse.orgVendor Advisory
- www.oracle.comPatch
Detection
read 2026-10-23 19:23 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- 2 repositories, unverifiedmotikan2010/CVE-2020-27223ttestoo/Jetty-CVE-2020-27223 PoC-in-GitHub
Sources
- CNACVSS 3.15.2read 2026-10-23
- NVDCVSS 3.15.3read 2026-10-23
- NVDCVSS 2.04.3read 2026-10-23
- CNAweakness (CWE)CWE-407read 2026-10-23
- NVDweakness (CWE)CWE-400read 2026-10-23
- FIRST EPSSEPSS score78.0 %read 2026-10-23
- PoC-in-GitHubproof of concept2read 2026-10-23
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Published
- 2021-02-26
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2020-27223?
Is CVE-2020-27223 actively exploited?
What is the CVSS score for CVE-2020-27223?
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