CVE-2019-14243

Proxyprotocol vulnerability

CVSS

7.5

EPSS

4.3%

EPSS pct

90th

Exploited

No known

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.

Affected vendor

Haproxy

Affected product

Proxyprotocol

CVSS vector

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

Weakness type (CWE)

CWE-20 — Improper Input Validation

Published

2019-07-23

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 4.3% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 90% of all scored CVEs.

Check your external exposure to CVE-2019-14243

Confirm whether Haproxy Proxyprotocol is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2019-14243.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-14243

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2019-14243 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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