CVE-2022-34037

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-07-22 · updated 2026-06-17
Weakness: CWE-125

Description

An out-of-bounds read in the rewrite function at /modules/caddyhttp/rewrite/rewrite.go in Caddy v2.5.1 allows attackers to cause a Denial of Service (DoS) via a crafted URI. Note: This has been disputed as a bug, not a security vulnerability, in the Caddy web server that emerged when an administrator's bad configuration containing a malformed request URI caused the server to return an empty reply instead of a valid HTTP response to the client.

Affected products

caddyserver caddy: 2.5.1

References

https://github.com/caddyserver/caddy/issues/4775
https://github.com/caddyserver/caddy/issues/4775#issuecomment-1203388116
https://github.com/caddyserver/caddy/issues/4775
https://github.com/caddyserver/caddy/issues/4775#issuecomment-1203388116

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