CVE-2020-11993

HIGH

Apache HTTP Server < 2.4.44 - HTTP Request Smuggling

Title source: rule

Description

Apache HTTP Server versions 2.4.20 to 2.4.43 When trace/debug was enabled for the HTTP/2 module and on certain traffic edge patterns, logging statements were made on the wrong connection, causing concurrent use of memory pools. Configuring the LogLevel of mod_http2 above "info" will mitigate this vulnerability for unpatched servers.

References (26)

[Vendor Advisory] https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2020-11993

[Third Party Advisory] https://security.gentoo.org/glsa/202008-04

[Patch] https://lists.apache.org/thread.html/r9e9f1a7609760f0f80562eaaec2aa3c32d525c3e0fca98b475240c71%40%3Cdev.httpd.apache.org%3E

[Patch] https://lists.apache.org/thread.html/r5debe8f82728a00a4a68bc904dd6c35423bdfc8d601cfb4579f38bf1%40%3Cdev.httpd.apache.org%3E

[Patch] https://lists.apache.org/thread.html/r623de9b2b2433a87f3f3a15900419fc9c00c77b26936dfea4060f672%40%3Cdev.httpd.apache.org%3E

[Third Party Advisory] https://usn.ubuntu.com/4458-1/

[Third Party Advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4NKWG2EXAQQB6LMLATKZ7KLSRGCSHVAN/

[Third Party Advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVFDBVM6E3JF3O7RYLRPRCH3RDRHJJY/

[Mailing List, Third Party Advisory] http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00068.html

[Mailing List, Third Party Advisory] http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00071.html

[Third Party Advisory] https://www.debian.org/security/2020/dsa-4757

[Vendor Advisory] https://www.oracle.com/security-alerts/cpuoct2020.html

[Third Party Advisory] https://security.netapp.com/advisory/ntap-20200814-0005/

[Mailing List, Third Party Advisory] http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00081.html

[Third Party Advisory] https://www.oracle.com/security-alerts/cpujan2021.html

[Exploit, Third Party Advisory, VDB Entry] http://packetstormsecurity.com/files/160393/Apache-2-HTTP2-Module-Concurrent-Pool-Usage.html

[Patch] https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E

[Patch] https://lists.apache.org/thread.html/r06f0d87ebb6d59ed8379633f36f72f5b1f79cadfda72ede0830b42cf%40%3Ccvs.httpd.apache.org%3E

[Patch] https://lists.apache.org/thread.html/r09bb998baee74a2c316446bd1a41ae7f8d7049d09d9ff991471e8775%40%3Ccvs.httpd.apache.org%3E

[Patch] https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E

... and 6 more

Scores

CVSS v3 7.5

EPSS 0.3336

EPSS Percentile 96.9%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

CWE

CWE-444

Status published

Products (19)

apache/http_server 2.4.20 - 2.4.44

canonical/ubuntu_linux 16.04

canonical/ubuntu_linux 18.04

canonical/ubuntu_linux 20.04

debian/debian_linux 10.0

fedoraproject/fedora 31

fedoraproject/fedora 32

netapp/clustered_data_ontap

opensuse/leap 15.1

opensuse/leap 15.2

... and 9 more

Published Aug 07, 2020

Tracked Since Feb 18, 2026