CVE-2020-13950
published 2021-06-10CVE-2020-13950: Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both…
PriorityP354high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
49.09%
98.8th percentile
Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service
Affected
16 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| apache | http_server | 2.4.41 – 2.4.46 | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| apache_software_foundation | apache_http_server | — | — |
| debian | apache2 | < apache2 2.4.46-6 (bookworm) | apache2 2.4.46-6 (bookworm) |
| debian | debian_linux | — | — |
| debian | debian_linux | — | — |
| fedoraproject | fedora | — | — |
| fedoraproject | fedora | — | — |
| msrc | cbl2_httpd_2.4.46-10_on_cbl_mariner_2.0 | — | — |
| msrc | cm1_httpd_2.4.46-5_on_cbl_mariner_1.0 | — | — |
| oracle | enterprise_manager_ops_center | — | — |
| oracle | instantis_enterprisetrack | — | — |
| oracle | instantis_enterprisetrack | — | — |
| oracle | instantis_enterprisetrack | — | — |
| oracle | zfs_storage_appliance_kit | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv2.05.0MEDIUMAV:N/AC:L/Au:N/C:N/I:N/A:P
osv7.5HIGH
vendor_debian7.5HIGH
vendor_msrc7.5HIGH
vendor_redhat7.5HIGH
vendor_ubuntu7.5HIGH
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Ubuntu
Apache HTTP Server vulnerabilities
vendor_ubuntu·2021-06-21·CVSS 7.5
CVE-2021-26691 [HIGH] Apache HTTP Server vulnerabilities
Title: Apache HTTP Server vulnerabilities
Summary: Several security issues were fixed in Apache HTTP Server.
Marc Stern discovered that the Apache mod_proxy_http module incorrectly
handled certain requests. A remote attacker could possibly use this issue
to cause Apache to crash, resulting in a denial of service. This issue only
affected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2020-13950)
Antonio Morales discovered that the Apache mod_auth_digest module
incorrectly handled certain Digest nonces. A remote attacker could possibly
use this issue to cause Apache to crash, resulting in a denial of service.
(CVE-2020-35452)
Antonio Morales discovered that the Apache mod_session module incorrectly
handled certain Cookie headers. A remote attacker could possibly use this
issue t
Microsoft
mod_proxy_http NULL pointer dereference
vendor_msrc·2021-06-08·CVSS 7.5
CVE-2020-13950 [HIGH] CWE-476 mod_proxy_http NULL pointer dereference
mod_proxy_http NULL pointer dereference
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
apache: apache
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Reference: https://learn.microsoft.com
Red Hat
httpd: mod_proxy NULL pointer dereference
vendor_redhat·2021-06-04·CVSS 7.5
CVE-2020-13950 [HIGH] CWE-476 httpd: mod_proxy NULL pointer dereference
httpd: mod_proxy NULL pointer dereference
Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service
A flaw was found In Apache httpd. The mod_proxy has a NULL pointer dereference. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Package: httpd (Red Hat Enterprise Linux 6) - Not affected
Package: httpd (Red Hat Enterprise Linux 7) - Not affected
Package: httpd (Red Hat Enterprise Linux 9) - Not affected
Package: httpd22 (Red Hat JBoss Enterprise Application Platform 6) - Out of support scope
Package: httpd22 (Red Hat JBoss Enterprise Web Server 2) - O
Debian
CVE-2020-13950: apache2 - Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash...
vendor_debian·2020·CVSS 7.5
CVE-2020-13950 [HIGH] CVE-2020-13950: apache2 - Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash...
Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service
Scope: local
bookworm: resolved (fixed in 2.4.46-6)
bullseye: resolved (fixed in 2.4.46-6)
forky: resolved (fixed in 2.4.46-6)
sid: resolved (fixed in 2.4.46-6)
trixie: resolved (fixed in 2.4.46-6)
GHSA
GHSA-pqc6-p826-c5qw: Apache HTTP Server versions 2
ghsa_unreviewed·2022-05-24
CVE-2020-13950 [HIGH] CWE-476 GHSA-pqc6-p826-c5qw: Apache HTTP Server versions 2
Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service
OSV
apache2 vulnerabilities
osv·2021-06-21·CVSS 7.5
CVE-2020-13950 [HIGH] apache2 vulnerabilities
apache2 vulnerabilities
Marc Stern discovered that the Apache mod_proxy_http module incorrectly
handled certain requests. A remote attacker could possibly use this issue
to cause Apache to crash, resulting in a denial of service. This issue only
affected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2020-13950)
Antonio Morales discovered that the Apache mod_auth_digest module
incorrectly handled certain Digest nonces. A remote attacker could possibly
use this issue to cause Apache to crash, resulting in a denial of service.
(CVE-2020-35452)
Antonio Morales discovered that the Apache mod_session module incorrectly
handled certain Cookie headers. A remote attacker could possibly use this
issue to cause Apache to crash, resulting in a denial of service.
(CVE-2021-26690)
Christoph
OSV
CVE-2020-13950: Apache HTTP Server versions 2
osv·2021-06-10·CVSS 7.5
CVE-2020-13950 [HIGH] CVE-2020-13950: Apache HTTP Server versions 2
Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service
No detection rules found.
No public exploits indexed.
http://httpd.apache.org/security/vulnerabilities_24.htmlhttp://www.openwall.com/lists/oss-security/2021/06/10/4https://lists.apache.org/thread.html/r7f2b70b621651548f4b6f027552f1dd91705d7111bb5d15cda0a68dd%40%3Cdev.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/rbe197409ae4a58b629fb792d1aed541ccbbf865121a80e1c5938d223%40%3Cannounce.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/re026d3da9d7824bd93b9f871c0fdda978d960c7e62d8c43cba8d0bf3%40%3Ccvs.httpd.apache.org%3Ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/https://security.gentoo.org/glsa/202107-38https://security.netapp.com/advisory/ntap-20210702-0001/https://www.oracle.com/security-alerts/cpuoct2021.htmlhttp://httpd.apache.org/security/vulnerabilities_24.htmlhttp://www.openwall.com/lists/oss-security/2021/06/10/4https://lists.apache.org/thread.html/r7f2b70b621651548f4b6f027552f1dd91705d7111bb5d15cda0a68dd%40%3Cdev.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/rbe197409ae4a58b629fb792d1aed541ccbbf865121a80e1c5938d223%40%3Cannounce.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/re026d3da9d7824bd93b9f871c0fdda978d960c7e62d8c43cba8d0bf3%40%3Ccvs.httpd.apache.org%3Ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/https://security.gentoo.org/glsa/202107-38https://security.netapp.com/advisory/ntap-20210702-0001/https://www.oracle.com/security-alerts/cpuoct2021.html
2021-06-10
Published