Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 54.8%
CVSS Severity
CVSS v3 Score 5.3
References
Products affected by CVE-2023-6193
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cpe:2.3:a:cloudflare:quiche:0.15.0
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cpe:2.3:a:cloudflare:quiche:0.16.0
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cpe:2.3:a:cloudflare:quiche:0.17.1
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cpe:2.3:a:cloudflare:quiche:0.17.2
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cpe:2.3:a:cloudflare:quiche:0.18.0
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cpe:2.3:a:cloudflare:quiche:0.19.0