What’s Vulnerable › Vulnerabilities

CVE-2018-21246

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-06-15 · updated 2026-06-17
• Weakness: CWE-287

Description

Caddy before 0.10.13 mishandles TLS client authentication, as demonstrated by an authentication bypass caused by the lack of the StrictHostMatching mode.

Affected products

• caddyserver caddy: before 0.10.3 — fixed in 0.10.3

How to fix

Upgrade to a fixed version: caddyserver caddy 0.10.3. Check the vendor advisory for mitigations.

References

• https://bugs.gentoo.org/715214
• https://github.com/caddyserver/caddy/releases/tag/v0.10.13
• https://bugs.gentoo.org/715214
• https://github.com/caddyserver/caddy/releases/tag/v0.10.13

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