CVE-2019-19343

A flaw was found in Undertow when using Remoting as shipped in Red Hat Jboss EAP before version 7...

7.5 HighFix available

A flaw was found in Undertow when using Remoting as shipped in Red Hat Jboss EAP before version 7.2.4. A memory leak in HttpOpenListener due to holding remote connections indefinitely may lead to denial of service. Versions before undertow 2.0.25.SP1 and jboss-remoting 5.0.14.SP1 are believed to be vulnerable.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

1.63%Up 0.9 points since Apr 14, 2021

What each source reports

NVD Score used 7.5

Record: CVE-2019-19343
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness: CWE-400, CWE-404
Updated: 2026-11-02

CVE List No score

Record: CVE-2019-19343
Weakness: CWE-400
Updated: 2026-11-02

EUVDEUVD-2019-8964 No score

Record: EUVD-2019-8964
Updated: 2026-11-03

GitHub AdvisoriesGHSA-4v4m-hgv5-x3qx 7.5

A flaw was found in Undertow when using Remoting as shipped in Red Hat Jboss EAP before version 7...

Record: GHSA-4v4m-hgv5-x3qx
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-400, CWE-404
Updated: 2026-11-02

OSV 7.5

Record: CVE-2019-19343
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2019-19343 7.5

Record: DEBIAN-CVE-2019-19343
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2019-19343 7.5

Record: UBUNTU-CVE-2019-19343
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`undertow` Debian:14	before 2.0.25-1, plus listed versions 1.3.11-11.3.16-11.3.19-11.3.21-11.3.23-1 Show 21 moreShow less 1.3.4-11.3.5-11.3.7-11.4.0-11.4.1-11.4.18-11.4.20-11.4.21-11.4.21-21.4.22-11.4.23-11.4.23-21.4.23-31.4.25-11.4.25-21.4.3-11.4.4-11.4.6-11.4.7-11.4.8-12.0.23-1	2.0.25-1
`undertow` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 1.3.4-11.3.5-11.3.7-11.3.11-11.3.16-11.3.16-1ubuntu0.1~esm1	None known
`undertow` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 1.4.20-11.4.21-11.4.22-11.4.23-11.4.23-2build11.4.23-31.4.23-3ubuntu0.1~esm1	None known
`undertow` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 2.0.23-12.0.27-12.0.28-12.0.29-12.0.29-1ubuntu0.1~esm1	None known
`undertow` Ubuntu:Pro:22.04:LTS	All versions, plus listed versions 2.2.8-12.2.12-12.2.13-12.2.14-12.2.16-12.2.16-1ubuntu0.1~esm1	None known
`undertow` Ubuntu:Pro:24.04:LTS	All versions, plus listed versions 2.3.8-22.3.8-2ubuntu0.1~esm1	None known
`undertow` Ubuntu:25.10	All versions, plus listed versions 2.3.18-12.3.18-2	None known
`undertow` Ubuntu:26.10	All versions, plus listed versions 2.3.20-1ubuntu1	None known
`undertow` Ubuntu:26.04:LTS	All versions, plus listed versions 2.3.18-22.3.20-12.3.20-1ubuntu1	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, products	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-19343 is a high vulnerability (CVSS 7.5) in Red Hat Undertow, published March 23, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.63%, the 76th percentile. Fixed in undertow 2.0.25-1.