CVE-2018-19148

mediumpriority · track · 15EPSS 0.009 · 58 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.86% (58th) EPSS

CVSS 4.3 · medium

Is it mine?

3 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-28

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.

cvss

Technical severity, 0–10. One row per scoring source.

4.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.4–4.3

v2.04.3mediumAV:N/AC:M/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.03.7lowCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 2.2 · impact 1.4

v3.03.7lowCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · OSV

v3.03.4lowCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-200USprimaryCWE-200US

affected products (3)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
caddyserver caddy≤ 0.11.0nvdUScpe:2.3:a:caddyserver:caddy:*:*:*:*:*:*:*:*
Go github.com/caddyserver/caddy< 0.11.1osvUSpkg:golang/github.com/caddyserver/caddy

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-jf2w-mq6r-56v8Caddy allows enumeration of Certificates and Hostnames2022-05-14ghsa · osvUS
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.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2018-11-10modified 2026-06-17

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+19457 more

references (10)

External citations — patches, advisories, analysis.

https://github.com/mholt/caddy/issues/1303 cnnvd
https://github.com/mholt/caddy/issues/2334 cnnvd
https://github.com/mholt/caddy/pull/2015 cnnvd
https://github.com/mholt/caddy/issues/1303 enisa_euvd
https://github.com/mholt/caddy/issues/2334 enisa_euvd
https://github.com/mholt/caddy/pull/2015 enisa_euvd
https://github.com/mholt/caddy/issues/1303Issue TrackingPatchThird Party Advisorynvd
https://github.com/mholt/caddy/issues/2334Issue TrackingPatchThird Party Advisorynvd

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