`CVE-2019-17638` Eclipse Jetty

Affected software	Eclipse Jetty
Severity	9.4 Critical CVSS 3.1 2 scores
Fixed in	`9.4.30.v20200611`
Weakness	CWE-672
Published	9 Jul 2020
Updated	17 Jun 2026

Description

In Eclipse Jetty, versions 9.4.27.v20200227 to 9.4.29.v20200521, in case of too large response headers, Jetty throws an exception to produce an HTTP 431 error. When this happens, the ByteBuffer containing the HTTP response headers is released back to the ByteBufferPool twice. Because of this double release, two threads can acquire the same ByteBuffer from the pool and while thread1 is about to use the ByteBuffer to write response1 data, thread2 fills the ByteBuffer with other data. Thread1 then proceeds to write the buffer that now contains different data. This results in client1, which issued request1 seeing data from another request or response which could contain sensitive data belonging to client2 (HTTP session ids, authentication credentials, etc.). If the Jetty version cannot be upgraded, the vulnerability can be significantly reduced by configuring a responseHeaderSize significantly larger than the requestHeaderSize (12KB responseHeaderSize and 8KB requestHeaderSize).

CWE-675

Exploitation status

No public exploit

No exploit has been reported in the sources we check. The 1 repository below are public GitHub repositories with fewer than 5 stars.

CISA KEV not listed
VulnCheck KEV not listed
CISA Vulnrichment no assessment published
Indexed PoC 1 indexed, none at 5+ stars
EPSS 11% chance in 30 days A model's forecast, not a report of exploitation. Higher than 96% of all scored CVEs.

1 of these are GitHub repositories with fewer than 5 stars. They are listed for reference and don't count toward the exploitation status above.

Index	Artifact	Stars	First seen
GitHub PoC	forse01/CVE-2019-17638-Jetty	1	2021-02-04

Index

Artifact

Stars

First seen

GitHub PoC

forse01/CVE-2019-17638-Jetty

2021-02-04

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists: eclipse/jetty.project ff8ae56.

Protection none
Action unverified
Review automated Upstream data
Record active

Decided by	Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding	This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.

Decided by

Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all

Finding

This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.

CVSS

9.4 CRITICAL v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

Version Score Band Vector Assigner Type

CVSS 3.1 9.4 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L NVD Primary published

CVSS 2.0 7.5 none AV:N/AC:L/Au:N/C:P/I:P/A:P NVD Primary

Version	Score	Band	Vector	Assigner	Type
CVSS 3.1	9.4	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L`	NVD	Primary	published
CVSS 2.0	7.5	none	`AV:N/AC:L/Au:N/C:P/I:P/A:P`	NVD	Primary

Affected software and releases

Oracle advisories

Advisory	Type	Quarter	Products Oracle names in its risk matrix
Oracle Critical Patch Update April 2021 ↗	CPU	2021-Q2	Oracle Financial Services Applications / Demographics (Eclipse Jetty) (12.0.0, 12.1.0) Oracle Fusion Middleware / Common Components (Eclipse Jetty) (12.2.1.3.0, 12.2.1.4.0)
Oracle Critical Patch Update October 2020 ↗	CPU	2020-Q4	Oracle Communications / Core (Eclipse Jetty) (8.2.0-8.2.2) Oracle Communications / Core (Eclipse Jetty) (8.2.0-8.2.2) Oracle Communications / Core (Eclipse Jetty) (8.2.0-8.2.2) Oracle Communications / WS and WEB (Eclipse Jetty) (3.9m0p1) Oracle Enterprise Manager / Load Testing for Web Apps (Eclipse Jetty) (13.3.0.1) Oracle Hospitality Applications / Base (Eclipse Jetty) (4.2.0, 4.2.1)

Advisory

Type

Quarter

Products Oracle names in its risk matrix

Oracle Critical Patch Update April 2021 ↗

CPU

2021-Q2

Oracle Financial Services Applications / Demographics (Eclipse Jetty) (12.0.0, 12.1.0)
Oracle Fusion Middleware / Common Components (Eclipse Jetty) (12.2.1.3.0, 12.2.1.4.0)

Oracle Critical Patch Update October 2020 ↗

CPU

2020-Q4

Oracle Communications / Core (Eclipse Jetty) (8.2.0-8.2.2)
Oracle Communications / Core (Eclipse Jetty) (8.2.0-8.2.2)
Oracle Communications / Core (Eclipse Jetty) (8.2.0-8.2.2)
Oracle Communications / WS and WEB (Eclipse Jetty) (3.9m0p1)
Oracle Enterprise Manager / Load Testing for Web Apps (Eclipse Jetty) (13.3.0.1)
Oracle Hospitality Applications / Base (Eclipse Jetty) (4.2.0, 4.2.1)

Oracle components and versions

Family	Component	Versions, as Oracle lists them	Read as
Oracle Communications	Core (Eclipse Jetty)	8.2.0-8.2.2
Oracle Communications	WS and WEB (Eclipse Jetty)	3.9m0p1	3.9.0.1
Oracle Enterprise Manager	Load Testing for Web Apps (Eclipse Jetty)	13.3.0.1	13.3.0.1
Oracle Financial Services Applications	Demographics (Eclipse Jetty)	12.0.0, 12.1.0	12.0.0 · 12.1.0
Oracle Fusion Middleware	Common Components (Eclipse Jetty)	12.2.1.3.0, 12.2.1.4.0	12.2.1.3.0 · 12.2.1.4.0
Oracle Hospitality Applications	Base (Eclipse Jetty)	4.2.0, 4.2.1	4.2.0 · 4.2.1

Family

Component

Versions, as Oracle lists them

Read as

Oracle Communications

Core (Eclipse Jetty)

8.2.0-8.2.2

Oracle Communications

WS and WEB (Eclipse Jetty)

3.9m0p1

3.9.0.1

Oracle Enterprise Manager

Load Testing for Web Apps (Eclipse Jetty)

13.3.0.1

Oracle Financial Services Applications

Demographics (Eclipse Jetty)

12.0.0, 12.1.0

12.0.0 · 12.1.0

Oracle Fusion Middleware

Common Components (Eclipse Jetty)

12.2.1.3.0, 12.2.1.4.0

12.2.1.3.0 · 12.2.1.4.0

Oracle Hospitality Applications

Base (Eclipse Jetty)

4.2.0, 4.2.1

4.2.0 · 4.2.1

Maven packages

Affected and fixed versions, from OSV.dev

Package Introduced Fixed Last affected

org.eclipse.jetty:jetty-server 9.4.27 9.4.30.v20200611 unbounded

Package	Introduced	Fixed	Last affected
`org.eclipse.jetty:jetty-server`	9.4.27	`9.4.30.v20200611`	unbounded

Products and versions

2 products, 4 version entries

Source	Vendor	Product	Scheme	Affected versions
nvd	eclipse	jetty	generic	9.4.27:20200227 · 9.4.28:20200408 · 9.4.29:20200521
osv	org.eclipse.jetty	jetty-server	generic	≥ 9.4.27 and ＜ 9.4.30.99999

Source

Vendor

Product

Scheme

Affected versions

nvd

eclipse

jetty

generic

9.4.27:20200227 · 9.4.28:20200408 · 9.4.29:20200521

osv

org.eclipse.jetty

jetty-server

generic

≥ 9.4.27 and ＜ 9.4.30.99999

References

URL	Tags
https://github.com/eclipse/jetty.project/issues/4936	WEB
https://github.com/eclipse/jetty.project/commit/ff8ae56fa939c3477a0cdd1ff56ce3d902f08fba	WEB
https://www.oracle.com/security-alerts/cpuoct2020.html	WEB
https://www.oracle.com/security-alerts/cpuApr2021.html	WEB
https://snyk.io/vuln/SNYK-JAVA-ORGECLIPSEJETTY-575561	WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XE6US6VPZHOWFMUSFGDS5V2DNQPY5MKB	WEB
https://lists.apache.org/thread.html/rd98cfd012490cb02caa1a11aaa0cc38bff2d43bcce9b20c2f01063dd@%3Ccommits.pulsar.apache.org%3E	WEB
https://lists.apache.org/thread.html/rd0e44e8ef71eeaaa3cf3d1b8b41eb25894372e2995ec908ce7624d26@%3Ccommits.pulsar.apache.org%3E	WEB
https://lists.apache.org/thread.html/rbe1f230e87ea947593145d0072d0097ddb0af10fee1161db8ca1546c@%3Ccommits.pulsar.apache.org%3E	WEB
https://lists.apache.org/thread.html/ra8661fc8c69c647cb06153c1485d48484a833d873f75dfe45937e9de@%3Ccommits.pulsar.apache.org%3E	WEB

URL

Timeline

Published	2020-07-09	By the CVE Program.
NVD record modified	2026-06-17	NVD's own last-modified date for this record.

Published

2020-07-09

By the CVE Program.

NVD record modified

2026-06-17

NVD's own last-modified date for this record.

How VRT decided (17 of 24 rules ran)

17 of 24 rules ran. The rest didn't run because an earlier rule had already settled the CVE.

# Rule Outcome Status Detail

identity: Does this identifier describe a vulnerability at all? the first rule that matches decides

1 rejected no match CVE Program withdrawal of this identifier

scope: Is it a vulnerability Waratek protects? the first rule that matches decides

2 armr-patch-file no match An ARMR patch file on disk for this CVE

3 armr-secure-rule-file no match An ARMR security-rule template on disk for this CVE

4 manual-classification no match A researcher's recorded decision for this specific CVE

5 manual classification no match Manual classification of this CVE in the legacy dataset

6 non-java-upstream no match A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

7 oracle-component no match The defect being in a component of a tracked product the agent does not reach: JavaFX, the Java SE installer, the JInitiator browser plug-in, the native WebLogic proxy plug-in, or a native part of Oracle Application Server or Collaboration Suite (HTTP Server, Web Cache, Internet Directory, mail and calendar servers). Oracle gives these no CPE of their own and names them only in the description.

8 java-client-side no match Oracle's own risk-matrix note saying the CVE is reached only through untrusted code in the Java sandbox (applets, Web Start) or only through a client installation of Java, so a server running its own trusted code is not exposed

9 osv-maven matched In scope Maven packages: org.eclipse.jetty:jetty-server

10 cna-maven-package not reached An affected Maven artifact named by the CNA itself

11 known-cpe-product not reached An NVD CPE naming a product ARMR tracks

12 cna-cpe-product not reached A CPE the CNA published naming a tracked product. Oracle publishes these on advisory day, months before NVD.

13 oracle-advisory-family not reached A tracked product family named in Oracle's own risk matrix. CPE cannot carry a suite name, only a module.

14 cna-named-product not reached A tracked product named in words by the CVE's own CNA, on a record with no CPE yet. Apache and Eclipse publish these on advisory day, before NVD adds CPE data.

15 non-deployable-product not reached The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached

16 unmatched-product not reached No tracked product matched above, and none present at all

disposition: What do we do about one that is? every rule runs

17 patch-hint no match A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug

18 open-source-maven matched Mitigation candidate Open-source Maven artifact indexed by OSV (Maven packages: org.eclipse.jetty:jetty-server). The source is public, which makes an ARMR patch rule a candidate; nothing here establishes that one can be written.

19 poc-derivable skipped An indexed exploit clearing the evidence bar to reverse-engineer, where there is no source to read

20 no-exploit skipped Nothing to build a rule from yet: no published exploit, no CISA record of exploitation and no source-level change to read

21 secure-rule-match no match A vulnerability class already blocked by an ARMR security rule

22 exploited-no-fix-or-poc skipped Somebody exploiting this CVE (a CISA or VulnCheck KEV listing, or a CISA verdict of active exploitation), with no fix, source code or PoC to build a rule from

23 below-action-threshold no match Severity is CRITICAL — only MEDIUM/LOW are deprioritized

24 no-exploit-published decided it matched No exploit published No exploit code has been published, and an upstream fix path does exist, so the remediation half of the candidacy still holds.

Products the scope rules checked

The products this CVE's record names, and whether VRT tracks each one. The scope rules decided on these.

Vendor Product Tracked CPE Source

eclipse jetty tracked cpe:2.3:a:eclipse:jetty:9.4.27:20200227:*:*:*:*:*:* yaml

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