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No exploitation reportedFix available

CVE-2020-27218

No exploitation reported by the sources we read.

  • Published2020-11-28
  • Fixed in9.4.35
  • WeaknessCWE-226

Am I 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 version 9.4.0.RC0 to 9.4.34.v20201102, 10.0.0.alpha0 to 10.0.0.beta2, and 11.0.0.alpha0 to 11.0.0.beta2, if GZIP request body inflation is enabled and requests from different clients are multiplexed onto a single connection, and if an attacker can send a request with a body that is received entirely but not consumed by the application, then a subsequent request on the same connection will see that body prepended to its body. The attacker will not see any data but may inject data into the body of the subsequent request.

Timeline

dates in UTC
  1. 2020-11-2801:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-27218?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-27218?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Eclipse jetty
BranchAffectedFixed in
9.4≥ 9.4.0, < 9.4.359.4.35
10.0= 10.0.0no fix published
11.0= 11.0.0no fix published
Apache spark
BranchAffectedFixed in
2.4= 2.4.8no fix published
3.0= 3.0.3no fix published
Oracle flexcube private banking
BranchAffectedFixed in
12.0= 12.0.0no fix published
12.1= 12.1.0no fix published

14 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

  1. Update Eclipse jetty to 9.4.35

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVSS 3.14.8read 2026-10-23
  • NVDCVSS 2.05.8read 2026-10-23
  • CNAweakness (CWE)CWE-226read 2026-10-23
  • FIRST EPSSEPSS score8.3 %2026-10-22

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
Published
2020-11-28
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2020-27218?

In Eclipse Jetty version 9.4.0.RC0 to 9.4.34.v20201102, 10.0.0.alpha0 to 10.0.0.beta2, and 11.0.0.alpha0 to 11.0.0.beta2, if GZIP request body inflation is enabled and requests from different clients are multiplexed onto a single connection, and if an attacker can send a request with a body that is received entirely but not consumed by the application, then a subsequent request on the same connection will see that body prepended to its body. The attacker will not see any data but may inject data into the body of the subsequent request.

Is CVE-2020-27218 actively exploited?

Active exploitation of CVE-2020-27218 has not been confirmed. Its EPSS score was 8.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-27218?

CVE-2020-27218 has a CVSS v3 base score of 4.8 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L.

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