Vulnerability Monitor

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CVE-2019-14243

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.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 1 product from haproxy organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2019, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2019-07-23T22:15:11.643

Last Modified

2024-11-21T04:26:16.877

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-20

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	haproxy	proxyprotocol	< 0.0.2	Yes

References

https://caddy.community/t/dos-in-http-proxyprotocol-plugin/6014 Third Party Advisory ([email protected])
https://github.com/mastercactapus/caddy-proxyprotocol/issues/8 Issue Tracking, Third Party Advisory ([email protected])
https://github.com/mastercactapus/proxyprotocol/commit/5c4a101121fc3e868026189c7a73f7f19eef90ac Patch, Third Party Advisory ([email protected])
https://github.com/mastercactapus/proxyprotocol/compare/ef496d7...5c4a101 Third Party Advisory ([email protected])
https://github.com/mastercactapus/proxyprotocol/issues/1 Exploit, Third Party Advisory ([email protected])
https://github.com/mastercactapus/proxyprotocol/releases/tag/v0.0.2 Release Notes, Third Party Advisory ([email protected])
https://caddy.community/t/dos-in-http-proxyprotocol-plugin/6014 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/mastercactapus/caddy-proxyprotocol/issues/8 Issue Tracking, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/mastercactapus/proxyprotocol/commit/5c4a101121fc3e868026189c7a73f7f19eef90ac Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/mastercactapus/proxyprotocol/compare/ef496d7...5c4a101 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/mastercactapus/proxyprotocol/issues/1 Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/mastercactapus/proxyprotocol/releases/tag/v0.0.2 Release Notes, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For haproxy's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.