Resource exhaustion in Cloudflare Quiche
CVE-2023-6193
quiche v. 0.15.0 through 0.19.0 was discovered to be vulnerable to unbounded queuing of path validation messages, which could lead to excessive resource consumption. QUIC path validation (RFC 9000 Section 8.2) requires that the recipient of a PATH_CHALLENGE frame responds by sending a PATH_RESPONSE. An unauthenticated remote attacker can exploit the vulnerability by sending PATH_CHALLENGE frames and manipulating the connection (e.g. by restricting the peer's congestion window size) so that PATH_RESPONSE frames can only be sent at the slower rate than they are received; leading to storage of path validation data in an unbounded queue. Quiche versions greater than 0.19.0 address this problem.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.008 (53.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Cloudflare Quiche — versions 0.15.0
Weakness classification (CWE)
References
- github.com/cloudflare/quiche/security/advisories/GHSA-w3vp-jw9m-f9pm (Vendor Advisory)
- datatracker.ietf.org/doc/html/rfc9000 (Technical Description)
Frequently asked questions
- What is CVE-2023-6193?
- CVE-2023-6193 is a medium-severity vulnerability in Cloudflare Quiche, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2023-12-12.
- How severe is CVE-2023-6193?
- Medium severity. CVSS v3 base score is 5.3 out of 10.