NULL pointer dereference in Apache Http_server
CVE-2021-44224
A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a decl…
EPSS: 0.823 (99.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.
Affected products
- Apache Http_server
- Apache Software Foundation Http Server — versions 2.4.7
- Apple Macos
- Apple Mac_os_x — versions 10.15.7
- Oracle Communications_element_manager
- Oracle Communications_operations_monitor — versions 4.0, 4.3, 4.4
- Oracle Communications_session_report_manager
- Oracle Communications_session_route_manager
- Oracle Http_server — versions 12.2.1.3.0, 12.2.1.4.0
- Oracle Instantis_enterprisetrack — versions 17.1, 17.2, 17.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@apache.org (x_refsource_MISC, Vendor Advisory)
- security@apache.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- security@apache.org (x_refsource_FEDORA, vendor-advisory)
- security@apache.org (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)
- security@apache.org (Patch, Third Party Advisory, x_refsource_MISC)
- security@apache.org (x_refsource_CONFIRM, Third Party Advisory)
- security@apache.org (x_refsource_CONFIRM, Third Party Advisory)
- security@apache.org (x_refsource_CONFIRM, Third Party Advisory)
- security@apache.org (x_refsource_FEDORA, vendor-advisory)
- security@apache.org (x_refsource_FEDORA, vendor-advisory)
Frequently asked questions
- What is CVE-2021-44224?
- CVE-2021-44224 is a high-severity vulnerability in Apache Http_server, classified under NULL Pointer Dereference. CVSS score: 8.2/10. Published 2021-12-20.
- How severe is CVE-2021-44224?
- High severity. CVSS v3 base score is 8.2 out of 10.
- Is CVE-2021-44224 known to be exploited?
- 15 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.