CVE-2023-3766: Invalid Slice Split Results in Server Panic

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-08-03 · updated 2026-06-17
Weakness: CWE-120

Description

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.

Affected products

Cloudflare odoh-rs: before 1.0.2 — fixed in 1.0.2

How to fix

Upgrade to a fixed version: Cloudflare odoh-rs 1.0.2. Check the vendor advisory for mitigations.

References

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