Debian Security Bug TrackerDEBIANCVE:CVE-2023-50247CVE-2023-50247
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.2 High
AI Score
Confidence
Low
0.001 Low
EPSS
Percentile
33.0%
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.
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| Debian | 12 | all | h2o | < 2.2.5+dfsg2-7 | h2o_2.2.5+dfsg2-7_all.deb |
| Debian | 11 | all | h2o | < 2.2.5+dfsg2-6 | h2o_2.2.5+dfsg2-6_all.deb |
| Debian | 999 | all | h2o | < 2.2.5+dfsg2-8.1 | h2o_2.2.5+dfsg2-8.1_all.deb |
| Debian | 13 | all | h2o | < 2.2.5+dfsg2-8.1 | h2o_2.2.5+dfsg2-8.1_all.deb |
Related
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.2 High
AI Score
Confidence
Low
0.001 Low
EPSS
Percentile
33.0%