Vulnerability Description
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.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Dena | H2O | <= 2.2.6 |
Related Weaknesses (CWE)
References
- https://github.com/h2o/h2o/commit/d67e81d03be12a9d53dc8271af6530f40164cd35Patch
- https://github.com/h2o/h2o/security/advisories/GHSA-2ch5-p59c-7mv6PatchVendor Advisory
- https://github.com/h2o/h2o/commit/d67e81d03be12a9d53dc8271af6530f40164cd35Patch
- https://github.com/h2o/h2o/security/advisories/GHSA-2ch5-p59c-7mv6PatchVendor Advisory
FAQ
What is CVE-2023-50247?
CVE-2023-50247 is a vulnerability with a CVSS score of 3.7 (LOW). 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...
How severe is CVE-2023-50247?
CVE-2023-50247 has been rated LOW with a CVSS base score of 3.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-50247?
Check the references section above for vendor advisories and patch information. Affected products include: Dena H2O.