CVE-2023-43622
high-risk
Published 2023-10-23
An attacker, opening a HTTP/2 connection with an initial window size of 0, was able to block handling of that connection indefinitely in Apache HTTP Server. This could be used to exhaust worker resources in the server, similar to the well known "slow loris" attack pattern. This has been fixed in version 2.4.58, so that such connection are terminated properly after the configured connection timeout. This issue affects Apache HTTP Server: from 2.4.55 through 2.4.57. Users are recommended to upgrade to version 2.4.58, which fixes the issue.
Do I need to act?
!
61.3% chance of exploitation in next 30 days
EPSS score — higher than 39% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10
High
NETWORK
/ LOW complexity
Affected Products (1)
Affected Vendors
References (4)
Vendor Advisory
https://httpd.apache.org/security/vulnerabilities_24.html
Third Party Advisory
https://security.netapp.com/advisory/ntap-20231027-0011/
Vendor Advisory
https://httpd.apache.org/security/vulnerabilities_24.html
Third Party Advisory
https://security.netapp.com/advisory/ntap-20231027-0011/
50
/ 100
high-risk
Severity
26/34 · High
Exploitability
19/34 · Moderate
Exposure
5/34 · Minimal