CVE-2018-19148

Name: CVE-2018-19148
Creator: NVD / NIST
Published: 2018-11-10T19:29:00.227+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 0.86%

Last modified Jun 17, 2026

CVE-2018-19148 is a vulnerability of currently unknown severity. Caddy through 0.11.0 sends incorrect certificates for certain invalid requests, making it easier for attackers to enumerate hostnames. Specifically, when unable to match a Host header with a vhost in its configuration, it serves the X.509 certificate for a randomly selected vhost in its configuration. EPSS estimates a 0.86% chance of exploitation in the next 30 days.

Description

Caddy through 0.11.0 sends incorrect certificates for certain invalid requests, making it easier for attackers to enumerate hostnames. Specifically, when unable to match a Host header with a vhost in its configuration, it serves the X.509 certificate for a randomly selected vhost in its configuration. Repeated requests (with a nonexistent hostname in the Host header) permit full enumeration of all certificates on the server. This generally permits an attacker to easily and accurately discover the existence of and relationships among hostnames that weren't meant to be public, though this information could likely have been discovered via other methods with additional effort.

Metrics

EPSS Probability

0.86%

53.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions
Caddyserver	Caddy	<= 0.11.0

References

https://github.com/mholt/caddy/issues/1303Issue Tracking, Patch, Third Party Advisory
https://github.com/mholt/caddy/issues/2334Issue Tracking, Patch, Third Party Advisory
https://github.com/mholt/caddy/pull/2015Issue Tracking, Patch, Third Party Advisory
https://securitytrails.com/blog/caddy-web-server-ssl-bugExploit, Patch, Third Party Advisory
https://github.com/mholt/caddy/issues/1303Issue Tracking, Patch, Third Party Advisory
https://github.com/mholt/caddy/issues/2334Issue Tracking, Patch, Third Party Advisory
https://github.com/mholt/caddy/pull/2015Issue Tracking, Patch, Third Party Advisory

Timeline

Published: Nov 10, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-19148?

How severe is CVE-2018-19148?

Severity scoring for CVE-2018-19148 is pending analysis. The EPSS model estimates a 0.86% probability of exploitation in the next 30 days.

How do I fix CVE-2018-19148?

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-2018-19148?

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

Scan your code now

Source: NVD / NIST