CVE-2006-20001
apache2: A carefully crafted If: request header can cause a memory read, or write ofa single zero byte, in a pool (heap) memor...
CVE-2006-20001 is fixed in 30 products on 1 platform, first by apache2 2.4.29-1ubuntu4.26, released January 17, 2023. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
7.5
Medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0358
89th percentile
A carefully crafted If: request header can cause a memory read, or write ofa single zero byte, in a pool (heap) memory location beyond the headervalue sent. This could cause the process to crash.This issue affects Apache HTTP Server 2.4.54 and earlier.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| apache2 · Debian 11.6 (bullseye) | 2.4.56-1~deb11u1 | DSA-5376-1 | Mar 20, 2023 |
| apache2 · Debian 12.15 (bookworm) | 2.4.55-1 | DEBIAN-CVE-2006-20001 | Jan 17, 2023 |
| apache2 · Debian 13.5 (trixie) | 2.4.55-1 | DEBIAN-CVE-2006-20001 | Jan 17, 2023 |
| apache2 · Debian 14 | 2.4.55-1 | DEBIAN-CVE-2006-20001 | Jan 17, 2023 |
| apache2 · Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.26 | apache2 2.4.29-1ubuntu4.26 | Jan 17, 2023 |
| apache2 · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.13 | apache2 2.4.41-4ubuntu3.13 | Jan 17, 2023 |
| apache2 · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.3 | apache2 2.4.52-1ubuntu4.3 | Jan 17, 2023 |
| apache2 · Ubuntu 24.10 (oracular) | 2.4.55-1ubuntu1 | apache2 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2 · Ubuntu 25.04 (plucky) | 2.4.55-1ubuntu1 | apache2 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-bin · Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.26 | apache2-bin 2.4.29-1ubuntu4.26 | Jan 17, 2023 |
| apache2-bin · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.13 | apache2-bin 2.4.41-4ubuntu3.13 | Jan 17, 2023 |
| apache2-bin · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.3 | apache2-bin 2.4.52-1ubuntu4.3 | Jan 17, 2023 |
| apache2-bin · Ubuntu 24.10 (oracular) | 2.4.55-1ubuntu1 | apache2-bin 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-bin · Ubuntu 25.04 (plucky) | 2.4.55-1ubuntu1 | apache2-bin 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-data · Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.26 | apache2-data 2.4.29-1ubuntu4.26 | Jan 17, 2023 |
| apache2-data · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.13 | apache2-data 2.4.41-4ubuntu3.13 | Jan 17, 2023 |
| apache2-data · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.3 | apache2-data 2.4.52-1ubuntu4.3 | Jan 17, 2023 |
| apache2-data · Ubuntu 24.10 (oracular) | 2.4.55-1ubuntu1 | apache2-data 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-data · Ubuntu 25.04 (plucky) | 2.4.55-1ubuntu1 | apache2-data 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-suexec-custom · Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.26 | apache2-suexec-custom 2.4.29-1ubuntu4.26 | Jan 17, 2023 |
| apache2-suexec-custom · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.13 | apache2-suexec-custom 2.4.41-4ubuntu3.13 | Jan 17, 2023 |
| apache2-suexec-custom · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.3 | apache2-suexec-custom 2.4.52-1ubuntu4.3 | Jan 17, 2023 |
| apache2-suexec-custom · Ubuntu 24.10 (oracular) | 2.4.55-1ubuntu1 | apache2-suexec-custom 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-suexec-custom · Ubuntu 25.04 (plucky) | 2.4.55-1ubuntu1 | apache2-suexec-custom 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-suexec-pristine · Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.26 | apache2-suexec-pristine 2.4.29-1ubuntu4.26 | Jan 17, 2023 |
| apache2-suexec-pristine · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.13 | apache2-suexec-pristine 2.4.41-4ubuntu3.13 | Jan 17, 2023 |
| apache2-suexec-pristine · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.3 | apache2-suexec-pristine 2.4.52-1ubuntu4.3 | Jan 17, 2023 |
| apache2-suexec-pristine · Ubuntu 24.10 (oracular) | 2.4.55-1ubuntu1 | apache2-suexec-pristine 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-suexec-pristine · Ubuntu 25.04 (plucky) | 2.4.55-1ubuntu1 | apache2-suexec-pristine 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-utils · Ubuntu 18.04.6 LTS (bionic) | 2.4.29-1ubuntu4.26 | apache2-utils 2.4.29-1ubuntu4.26 | Jan 17, 2023 |
| apache2-utils · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.13 | apache2-utils 2.4.41-4ubuntu3.13 | Jan 17, 2023 |
| apache2-utils · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.3 | apache2-utils 2.4.52-1ubuntu4.3 | Jan 17, 2023 |
| apache2-utils · Ubuntu 24.10 (oracular) | 2.4.55-1ubuntu1 | apache2-utils 2.4.55-1ubuntu1 | Jan 16, 2026 |
| apache2-utils · Ubuntu 25.04 (plucky) | 2.4.55-1ubuntu1 | apache2-utils 2.4.55-1ubuntu1 | Jan 16, 2026 |
| httpd · RHEL 8 | 0:2.4.37-51.module+el8.7.0+18026+7b169787.1 | RHSA-2023:0852 | Feb 21, 2023 |
| httpd · RHEL 9 | 0:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| httpd · almalinux 8 | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 | Feb 21, 2023 |
| httpd · almalinux 9 | 2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| httpd · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| httpd · ol 8 | 0:2.4.37-51.0.1.module+el8.7.0+20923+af3b70dd.1 | ELSA-2023-0852 | Feb 22, 2023 |
| httpd · ol 9 | 0:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| httpd · rocky 8 | 0:2.4.37-51.module+el8.7.0+1059+126e9251 | RLSA-2023:0852 | Feb 22, 2023 |
| httpd · rocky 9 | 0:2.4.53-7.el9_1.1 | RLSA-2023:0970 | Apr 6, 2023 |
| httpd-core · RHEL 9 | 0:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| httpd-core · almalinux 9 | 2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| httpd-core · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| httpd-core · ol 9 | 0:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| httpd-core-debuginfo · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| httpd-debuginfo · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| httpd-debugsource · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| httpd-devel · RHEL 8 | 0:2.4.37-51.module+el8.7.0+18026+7b169787.1 | RHSA-2023:0852 | Feb 21, 2023 |
| httpd-devel · RHEL 9 | 0:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| httpd-devel · almalinux 8 | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 | Feb 21, 2023 |
| httpd-devel · almalinux 9 | 2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| httpd-devel · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| httpd-devel · ol 8 | 0:2.4.37-51.0.1.module+el8.7.0+20923+af3b70dd.1 | ELSA-2023-0852 | Feb 22, 2023 |
| httpd-devel · ol 9 | 0:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| httpd-filesystem · RHEL 8 | 0:2.4.37-51.module+el8.7.0+18026+7b169787.1 | RHSA-2023:0852 | Feb 21, 2023 |
| httpd-filesystem · RHEL 9 | 0:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| httpd-filesystem · almalinux 8 | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 | Feb 21, 2023 |
| httpd-filesystem · almalinux 9 | 2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| httpd-filesystem · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| httpd-filesystem · ol 8 | 0:2.4.37-51.0.1.module+el8.7.0+20923+af3b70dd.1 | ELSA-2023-0852 | Feb 22, 2023 |
| httpd-filesystem · ol 9 | 0:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| httpd-manual · RHEL 8 | 0:2.4.37-51.module+el8.7.0+18026+7b169787.1 | RHSA-2023:0852 | Feb 21, 2023 |
| httpd-manual · RHEL 9 | 0:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| httpd-manual · almalinux 8 | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 | Feb 21, 2023 |
| httpd-manual · almalinux 9 | 2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| httpd-manual · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| httpd-manual · ol 8 | 0:2.4.37-51.0.1.module+el8.7.0+20923+af3b70dd.1 | ELSA-2023-0852 | Feb 22, 2023 |
| httpd-manual · ol 9 | 0:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| httpd-tools · RHEL 8 | 0:2.4.37-51.module+el8.7.0+18026+7b169787.1 | RHSA-2023:0852 | Feb 21, 2023 |
| httpd-tools · RHEL 9 | 0:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| httpd-tools · almalinux 8 | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 | Feb 21, 2023 |
| httpd-tools · almalinux 9 | 2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| httpd-tools · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| httpd-tools · ol 8 | 0:2.4.37-51.0.1.module+el8.7.0+20923+af3b70dd.1 | ELSA-2023-0852 | Feb 22, 2023 |
| httpd-tools · ol 9 | 0:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| httpd-tools-debuginfo · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| libapache2-mod-md · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.13 | libapache2-mod-md 2.4.41-4ubuntu3.13 | Jan 17, 2023 |
| libapache2-mod-md · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.3 | libapache2-mod-md 2.4.52-1ubuntu4.3 | Jan 17, 2023 |
| libapache2-mod-md · Ubuntu 24.10 (oracular) | 2.4.55-1ubuntu1 | libapache2-mod-md 2.4.55-1ubuntu1 | Jan 16, 2026 |
| libapache2-mod-proxy-uwsgi · Ubuntu 20.04 LTS (focal) | 2.4.41-4ubuntu3.13 | libapache2-mod-proxy-uwsgi 2.4.41-4ubuntu3.13 | Jan 17, 2023 |
| libapache2-mod-proxy-uwsgi · Ubuntu 22.04.1 LTS (jammy) | 2.4.52-1ubuntu4.3 | libapache2-mod-proxy-uwsgi 2.4.52-1ubuntu4.3 | Jan 17, 2023 |
| libapache2-mod-proxy-uwsgi · Ubuntu 24.10 (oracular) | 2.4.55-1ubuntu1 | libapache2-mod-proxy-uwsgi 2.4.55-1ubuntu1 | Jan 16, 2026 |
| mod_http2 · RHEL 8 | 0:1.15.7-5.module+el8.6.0+13996+01710940 | RHSA-2023:0852 | Feb 21, 2023 |
| mod_http2 · almalinux 8 | 1.15.7-5.module_el8.6.0+2872+fe0ff7aa | ALSA-2023:0852 | Feb 21, 2023 |
| mod_http2 · ol 8 | 0:1.15.7-5.module+el8.6.0+20548+01710940 | ELSA-2023-0852 | Feb 22, 2023 |
| mod_http2 · rocky 8 | 0:1.15.7-5.module+el8.6.0+823+f143cee1 | RLSA-2023:0852 | Feb 22, 2023 |
| mod_ldap · RHEL 8 | 0:2.4.37-51.module+el8.7.0+18026+7b169787.1 | RHSA-2023:0852 | Feb 21, 2023 |
| mod_ldap · RHEL 9 | 0:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| mod_ldap · almalinux 8 | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 | Feb 21, 2023 |
| mod_ldap · almalinux 9 | 2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| mod_ldap · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| mod_ldap · ol 8 | 0:2.4.37-51.0.1.module+el8.7.0+20923+af3b70dd.1 | ELSA-2023-0852 | Feb 22, 2023 |
| mod_ldap · ol 9 | 0:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| mod_ldap-debuginfo · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| mod_lua · RHEL 9 | 0:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| mod_lua · almalinux 9 | 2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| mod_lua · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| mod_lua · ol 9 | 0:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| mod_lua-debuginfo · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| mod_md · RHEL 8 | 1:2.0.8-8.module+el8.3.0+6814+67d1e611 | RHSA-2023:0852 | Feb 21, 2023 |
| mod_md · almalinux 8 | 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa | ALSA-2023:0852 | Feb 21, 2023 |
| mod_md · ol 8 | 1:2.0.8-8.module+el8.5.0+20475+4f6a8fd5 | ELSA-2023-0852 | Feb 22, 2023 |
| mod_md · rocky 8 | 1:2.0.8-8.module+el8.5.0+695+1fa8055e | RLSA-2023:0852 | Feb 22, 2023 |
| mod_proxy_html · RHEL 8 | 1:2.4.37-51.module+el8.7.0+18026+7b169787.1 | RHSA-2023:0852 | Feb 21, 2023 |
| mod_proxy_html · RHEL 9 | 1:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| mod_proxy_html · almalinux 8 | 1:2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 | Feb 21, 2023 |
| mod_proxy_html · almalinux 9 | 1:2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| mod_proxy_html · amzn 2023 | 1:2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| mod_proxy_html · ol 8 | 1:2.4.37-51.0.1.module+el8.7.0+20923+af3b70dd.1 | ELSA-2023-0852 | Feb 22, 2023 |
| mod_proxy_html · ol 9 | 1:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| mod_proxy_html-debuginfo · amzn 2023 | 1:2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| mod_session · RHEL 8 | 0:2.4.37-51.module+el8.7.0+18026+7b169787.1 | RHSA-2023:0852 | Feb 21, 2023 |
| mod_session · RHEL 9 | 0:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| mod_session · almalinux 8 | 2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 | Feb 21, 2023 |
| mod_session · almalinux 9 | 2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| mod_session · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| mod_session · ol 8 | 0:2.4.37-51.0.1.module+el8.7.0+20923+af3b70dd.1 | ELSA-2023-0852 | Feb 22, 2023 |
| mod_session · ol 9 | 0:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| mod_session-debuginfo · amzn 2023 | 2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| mod_ssl · RHEL 8 | 1:2.4.37-51.module+el8.7.0+18026+7b169787.1 | RHSA-2023:0852 | Feb 21, 2023 |
| mod_ssl · RHEL 9 | 1:2.4.53-7.el9_1.1 | RHSA-2023:0970 | Feb 28, 2023 |
| mod_ssl · almalinux 8 | 1:2.4.37-51.module_el8.7.0+3405+9516b832.1 | ALSA-2023:0852 | Feb 21, 2023 |
| mod_ssl · almalinux 9 | 1:2.4.53-7.el9_1.1 | ALSA-2023:0970 | Feb 28, 2023 |
| mod_ssl · amzn 2023 | 1:2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
| mod_ssl · ol 8 | 1:2.4.37-51.0.1.module+el8.7.0+20923+af3b70dd.1 | ELSA-2023-0852 | Feb 22, 2023 |
| mod_ssl · ol 9 | 1:2.4.53-7.0.1.el9_1.1 | ELSA-2023-0970 | Feb 28, 2023 |
| mod_ssl-debuginfo · amzn 2023 | 1:2.4.55-1.amzn2023 | ALAS2023-2023-115 | Mar 6, 2023 |
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