Vulnerability Monitor

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CVE-2023-50247

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The QUIC stack (quicly), as used by H2O up to commit 43f86e5 (in version 2.3.0-beta and prior), is susceptible to a state exhaustion attack. When H2O is serving HTTP/3, a remote attacker can exploit this vulnerability to progressively increase the memory retained by the QUIC stack. This can eventually cause H2O to abort due to memory exhaustion. The vulnerability has been resolved in commit d67e81d03be12a9d53dc8271af6530f40164cd35. HTTP/1 and HTTP/2 are not affected by this vulnerability as they do not use QUIC. Administrators looking to mitigate this issue without upgrading can disable HTTP/3 support.

Published

2023-12-12T20:15:08.580

Last Modified

2024-11-21T08:36:44.530

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 3.7 (LOW)

Weaknesses

Type: Primary
CWE-770

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	dena	h2o	≤ 2.2.6	Yes
Application	dena	h2o	2.3.0	Yes
Application	dena	h2o	2.3.0	Yes

References

https://github.com/h2o/h2o/commit/d67e81d03be12a9d53dc8271af6530f40164cd35 Patch ([email protected])
https://github.com/h2o/h2o/security/advisories/GHSA-2ch5-p59c-7mv6 Patch, Vendor Advisory ([email protected])
https://github.com/h2o/h2o/commit/d67e81d03be12a9d53dc8271af6530f40164cd35 Patch (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/h2o/h2o/security/advisories/GHSA-2ch5-p59c-7mv6 Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)