High severity · published Dec 20, 2021
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…
8.2
CVSS
82.3%
EPSS
No
On KEV
Description
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 declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)82.3% · higher than 100% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HS
HTTP Server · Apache
2.4.7 before 2.4.52 · source: NVD
MA
macOS · Apple
before 10.15.7; 11.0 before 11.6.6; 12.0.0 before 12.4 · source: NVD
CE
Communications Element Manager · Oracle
before 9.0 · source: NVD
CO
Communications Operations Monitor · Oracle
4.0; 4.3; 4.4; 5.0 · source: NVD
CS
Communications Session Report Manager · Oracle
before 9.0 · source: NVD
CS
Communications Session Route Manager · Oracle
before 9.0 · source: NVD
DL
Debian Linux · Debian
10.0; 11.0 · source: NVD
FE
Fedora · Fedoraproject
34; 35; 36 · source: NVD
IE
Instantis Enterprisetrack · Oracle
17.1; 17.2; 17.3 · source: NVD
MO
Mac OS X · Apple
10.15.7; 10.15.7; 10.15.7; 10.15.7; 10.15.7; 10.15.7; +7 more · source: NVD
TE
Tenable.sc · Tenable
5.14.0 before 5.20.0; 5.16.0 before 202201.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-44224
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-44224
Vendor Advisory
http://httpd.apache.org/security/vulnerabilities_24.html
Mailing List
http://seclists.org/fulldisclosure/2022/May/33
Mailing List
http://seclists.org/fulldisclosure/2022/May/35
Mailing List
http://seclists.org/fulldisclosure/2022/May/38
Mailing List
http://www.openwall.com/lists/oss-security/2021/12/20/3
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BFSWOH4X77CV7AH7C4RMHUBDWKQDL4YH/
More from HTTP Server
9.8
CVE-2021-42013
Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)
9.8
CVE-2021-41773
Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49
9.1
CVE-2024-38475
Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path.
9.0
CVE-2021-40438
mod_proxy SSRF
7.8
CVE-2019-0211
Apache HTTP Server Privilege Escalation Vulnerability