CVE-2019-14243

Name: CVE-2019-14243
Creator: NVD / NIST
Published: 2019-07-23T22:15:11.643+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 4.29%

Last modified Jun 17, 2026

CVE-2019-14243 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. headerv2.go in mastercactapus proxyprotocol before 0.0.2, as used in the mastercactapus caddy-proxyprotocol plugin through 0.0.2 for Caddy, allows remote attackers to cause a denial of service (webserver panic and daemon crash) via a crafted HAProxy PROXY v2 request with truncated source/destination address data.. EPSS estimates a 4.29% chance of exploitation in the next 30 days.

Description

headerv2.go in mastercactapus proxyprotocol before 0.0.2, as used in the mastercactapus caddy-proxyprotocol plugin through 0.0.2 for Caddy, allows remote attackers to cause a denial of service (webserver panic and daemon crash) via a crafted HAProxy PROXY v2 request with truncated source/destination address data.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

4.29%

89.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Haproxy	Proxyprotocol	< 0.0.2

References

https://caddy.community/t/dos-in-http-proxyprotocol-plugin/6014Third Party Advisory
https://github.com/mastercactapus/caddy-proxyprotocol/issues/8Issue Tracking, Third Party Advisory
https://github.com/mastercactapus/proxyprotocol/commit/5c4a101121fc3e868026189c7a73f7f19eef90acPatch, Third Party Advisory
https://github.com/mastercactapus/proxyprotocol/compare/ef496d7...5c4a101Third Party Advisory
https://github.com/mastercactapus/proxyprotocol/issues/1Exploit, Third Party Advisory
https://github.com/mastercactapus/proxyprotocol/releases/tag/v0.0.2Release Notes, Third Party Advisory
https://caddy.community/t/dos-in-http-proxyprotocol-plugin/6014Third Party Advisory
https://github.com/mastercactapus/caddy-proxyprotocol/issues/8Issue Tracking, Third Party Advisory
https://github.com/mastercactapus/proxyprotocol/commit/5c4a101121fc3e868026189c7a73f7f19eef90acPatch, Third Party Advisory
https://github.com/mastercactapus/proxyprotocol/compare/ef496d7...5c4a101Third Party Advisory
https://github.com/mastercactapus/proxyprotocol/issues/1Exploit, Third Party Advisory
https://github.com/mastercactapus/proxyprotocol/releases/tag/v0.0.2Release Notes, Third Party Advisory

Timeline

Published: Jul 23, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-14243?

How severe is CVE-2019-14243?

CVE-2019-14243 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 4.29% probability of exploitation in the next 30 days.

How do I fix CVE-2019-14243?

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-2019-14243?

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

Scan your code now

Source: NVD / NIST