CVE-2023-6193

Unbounded queuing of path validation messages in cloudflare-quiche

Description

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.

Category

5.3
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.32%
Vendor Advisory github.com
Affected: Cloudflare quiche
Published at:
Updated at:

References

Link Tags
https://github.com/cloudflare/quiche/security/advisories/GHSA-w3vp-jw9m-f9pm vendor advisory
https://datatracker.ietf.org/doc/html/rfc9000#section-8.2 technical description

Frequently Asked Questions

What is the severity of CVE-2023-6193?
CVE-2023-6193 has been scored as a medium severity vulnerability.
How to fix CVE-2023-6193?
To fix CVE-2023-6193, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-6193 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-6193 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-6193?
CVE-2023-6193 affects Cloudflare quiche.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.