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Vulnerability details: VCID-71rv-66rr-cfg5
Vulnerability ID VCID-71rv-66rr-cfg5
Aliases CVE-2020-13950
Summary 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
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-476 NULL Pointer Dereference
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-13950.json
epss 0.20337 https://api.first.org/data/v1/epss?cve=CVE-2020-13950
epss 0.20337 https://api.first.org/data/v1/epss?cve=CVE-2020-13950
epss 0.20337 https://api.first.org/data/v1/epss?cve=CVE-2020-13950
epss 0.20337 https://api.first.org/data/v1/epss?cve=CVE-2020-13950
epss 0.20337 https://api.first.org/data/v1/epss?cve=CVE-2020-13950
epss 0.20337 https://api.first.org/data/v1/epss?cve=CVE-2020-13950
epss 0.20337 https://api.first.org/data/v1/epss?cve=CVE-2020-13950
epss 0.20337 https://api.first.org/data/v1/epss?cve=CVE-2020-13950
epss 0.20337 https://api.first.org/data/v1/epss?cve=CVE-2020-13950
epss 0.20337 https://api.first.org/data/v1/epss?cve=CVE-2020-13950
epss 0.20337 https://api.first.org/data/v1/epss?cve=CVE-2020-13950
epss 0.20337 https://api.first.org/data/v1/epss?cve=CVE-2020-13950
epss 0.20337 https://api.first.org/data/v1/epss?cve=CVE-2020-13950
cvssv3.1 8.1 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
apache_httpd low https://httpd.apache.org/security/json/CVE-2020-13950.json
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2020-13950
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2020-13950
archlinux Medium https://security.archlinux.org/AVG-2053
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-13950.json
https://api.first.org/data/v1/epss?cve=CVE-2020-13950
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-13950
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://lists.apache.org/thread.html/r7f2b70b621651548f4b6f027552f1dd91705d7111bb5d15cda0a68dd%40%3Cdev.httpd.apache.org%3E
https://lists.apache.org/thread.html/rbe197409ae4a58b629fb792d1aed541ccbbf865121a80e1c5938d223%40%3Cannounce.httpd.apache.org%3E
https://lists.apache.org/thread.html/re026d3da9d7824bd93b9f871c0fdda978d960c7e62d8c43cba8d0bf3%40%3Ccvs.httpd.apache.org%3E
https://security.netapp.com/advisory/ntap-20210702-0001/
https://www.oracle.com/security-alerts/cpuoct2021.html
http://www.openwall.com/lists/oss-security/2021/06/10/4
1966738 https://bugzilla.redhat.com/show_bug.cgi?id=1966738
AVG-2053 https://security.archlinux.org/AVG-2053
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:*
cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:*
cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
CVE-2020-13950 https://httpd.apache.org/security/json/CVE-2020-13950.json
CVE-2020-13950 https://nvd.nist.gov/vuln/detail/CVE-2020-13950
RHSA-2021:4613 https://access.redhat.com/errata/RHSA-2021:4613
RHSA-2021:4614 https://access.redhat.com/errata/RHSA-2021:4614
RHSA-2022:5163 https://access.redhat.com/errata/RHSA-2022:5163
USN-4994-1 https://usn.ubuntu.com/4994-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-13950.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2020-13950
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-13950
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.95284
EPSS Score 0.20337
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:29:08.153799+00:00 Apache HTTPD Importer Import https://httpd.apache.org/security/json/CVE-2020-13950.json 37.0.0