Login Request a demo
High severity · published Oct 11, 2024
CVE-2024-45397
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3
7.5
CVSS
0.4%
EPSS
No
On KEV
Description
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When an HTTP request using TLS/1.3 early data on top of TCP Fast Open or QUIC 0-RTT packets is received and the IP-address-based access control is used, the access control does not detect and prohibit HTTP requests conveyed by packets with a spoofed source address. This behavior allows attackers on the network to execute HTTP requests from addresses that are otherwise rejected by the address-based access control. The vulnerability has been addressed in commit 15ed15a. Users may disable the use of TCP FastOpen and QUIC to mitigate the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 38% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
H2
H2o · Dena
before 2024-10-10 · source: NVD
Affected product
H2
H2o
Dena
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-45397
CVE.org
https://www.cve.org/CVERecord?id=CVE-2024-45397
Patch
https://github.com/h2o/h2o/commit/15ed15a2efb83a77bb4baaa5a119e639c2f6898a
Vendor Advisory
https://github.com/h2o/h2o/security/advisories/GHSA-jf2c-xjcp-wg4c
Product
https://h2o.examp1e.net/configure/http3_directives.html
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