Buffer overflow in Cloudflare Odoh-Rs
CVE-2023-3766
A vulnerability was discovered in the odoh-rs rust crate that stems from faulty logic during the parsing of encrypted queries. This issue specifically occurs when processing encrypted query data received from remote clients and enables an attacker with knowledge of this vulnerability to craft and send specially designed encrypted queries to targeted ODOH servers running with odoh-rs. Upon successful exploitation, the server will crash abruptly, disrupting its normal operation and rendering the service temporarily unavailable.
Vulnerability class: Buffer Overflow
EPSS: 0.006 (47.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Cloudflare Odoh-rs — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cna@cloudflare.com (vendor-advisory, Vendor Advisory)
- cna@cloudflare.com (Patch, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2023-3766?
- CVE-2023-3766 is a medium-severity vulnerability in Cloudflare Odoh-Rs, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.9/10. Published 2023-08-03.
- How severe is CVE-2023-3766?
- Medium severity. CVSS v3 base score is 5.9 out of 10.
- Is CVE-2023-3766 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.