Resource exhaustion in Apache Http_server
CVE-2023-43622
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…
Vulnerability class: DoS (Denial of Service)
EPSS: 0.706 (99.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Apache Http_server
- Apache Software Foundation Http Server — versions 2.4.55
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@apache.org (vendor-advisory, Vendor Advisory)
- security@apache.org (Third Party Advisory)
Frequently asked questions
- What is CVE-2023-43622?
- CVE-2023-43622 is a high-severity vulnerability in Apache Http_server, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2023-10-23.
- How severe is CVE-2023-43622?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2023-43622 known to be exploited?
- 12 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.