CVE-2019-19330

Name: CVE-2019-19330
Creator: NVD / NIST
Published: 2019-11-27T16:15:11.72+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.92%

Last modified Jun 17, 2026

CVE-2019-19330 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The HTTP/2 implementation in HAProxy before 2.0.10 mishandles headers, as demonstrated by carriage return (CR, ASCII 0xd), line feed (LF, ASCII 0xa), and the zero character (NUL, ASCII 0x0), aka Intermediary Encapsulation Attacks.. EPSS estimates a 3.92% chance of exploitation in the next 30 days.

Description

The HTTP/2 implementation in HAProxy before 2.0.10 mishandles headers, as demonstrated by carriage return (CR, ASCII 0xd), line feed (LF, ASCII 0xa), and the zero character (NUL, ASCII 0x0), aka Intermediary Encapsulation Attacks.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.92%

89.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-74

Affected Software

Vendor	Product	Versions
Haproxy	Haproxy	< 2.0.10
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	19.04
Canonical	Ubuntu Linux	19.10
Debian	Debian Linux	10.0

References

https://git.haproxy.org/?p=haproxy-2.0.git%3Ba=commit%3Bh=ac198b92d461515551b95daae20954b3053ce87e
https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=146f53ae7e97dbfe496d0445c2802dd0a30b0878
https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=54f53ef7ce4102be596130b44c768d1818570344
https://seclists.org/bugtraq/2019/Nov/45Mailing List, Third Party Advisory
https://security.gentoo.org/glsa/202004-01
https://tools.ietf.org/html/rfc7540#section-10.3Third Party Advisory
https://usn.ubuntu.com/4212-1/Third Party Advisory
https://www.debian.org/security/2019/dsa-4577Third Party Advisory
https://git.haproxy.org/?p=haproxy-2.0.git%3Ba=commit%3Bh=ac198b92d461515551b95daae20954b3053ce87e
https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=146f53ae7e97dbfe496d0445c2802dd0a30b0878
https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=54f53ef7ce4102be596130b44c768d1818570344
https://seclists.org/bugtraq/2019/Nov/45Mailing List, Third Party Advisory
https://security.gentoo.org/glsa/202004-01
https://tools.ietf.org/html/rfc7540#section-10.3Third Party Advisory
https://usn.ubuntu.com/4212-1/Third Party Advisory
https://www.debian.org/security/2019/dsa-4577Third Party Advisory

Timeline

Published: Nov 27, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-19330?

How severe is CVE-2019-19330?

CVE-2019-19330 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.92% probability of exploitation in the next 30 days.

How do I fix CVE-2019-19330?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-19330?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST