Auth bypass in Caddyserver Caddy
CVE-2018-21246
Caddy before 0.10.13 mishandles TLS client authentication, as demonstrated by an authentication bypass caused by the lack of the StrictHostMatching mode.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.027 (85.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 85.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.027 · newest: 0.027 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/caddyserver/caddy/releases/tag/v0.10.13 (Third Party Advisory, Release Notes)
- bugs.gentoo.org/715214 (Third Party Advisory)
Frequently asked questions
- What is CVE-2018-21246?
- CVE-2018-21246 is a critical-severity vulnerability in Caddyserver Caddy, classified under Improper Authentication. CVSS score: 9.8/10. Published 2020-06-15.
- How severe is CVE-2018-21246?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2018-21246 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.