Out-of-bounds Read in Caddyserver Caddy
CVE-2022-34037
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.012 (67.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: -0.000
Affected products
- Caddyserver Caddy — versions 2.5.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/caddyserver/caddy/issues/4775 (Exploit, Patch, Third Party Advisory, Issue Tracking)
- github.com/caddyserver/caddy/issues/4775
Frequently asked questions
- What is CVE-2022-34037?
- CVE-2022-34037 is a high-severity vulnerability in Caddyserver Caddy, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2022-07-22.
- How severe is CVE-2022-34037?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2022-34037 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.