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Fencer Vulns
high 7.5

CVE-2006-20001 json

Apache HTTP Server: mod_dav out of bounds read, or write of zero byte

published 2023-01-17 3 y ago modified 2026-06-16 4 mo ago also EUVD-2006-2000

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.6%
EPSS 3.6% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

A carefully crafted If: request header can cause a memory read, or write of a single zero byte, in a pool (heap) memory location beyond the header value sent. This could cause the process to crash.

This issue affects Apache HTTP Server 2.4.54 and earlier.

Patch / fix

  • apache http_server 2.4.55
  • apache2 Debian 14, Debian 13, Debian 12 2.4.55-1

debian advisories DEBIAN-CVE-2006-20001

  • apache2 Ubuntu 18.04 LTS 2.4.29-1ubuntu4.26
  • apache2 Ubuntu 20.04 LTS 2.4.41-4ubuntu3.13
  • apache2 Ubuntu 22.04 LTS 2.4.52-1ubuntu4.3
  • apache2 Ubuntu Pro 16.04 LTS 2.4.18-2ubuntu3.17+esm8

ubuntu advisories UBUNTU-CVE-2006-20001

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • jbcs-httpd24-curl jboss core services 1 8.0.1-1.el7jbcs
  • jbcs-httpd24-curl jboss core services 1 8.0.1-1.el8jbcs
  • jbcs-httpd24-httpd jboss core services 1 2.4.51-39.el7jbcs
  • jbcs-httpd24-httpd jboss core services 1 2.4.51-39.el8jbcs
  • jbcs-httpd24-libcurl jboss core services 1 8.0.1-1.el7jbcs
  • jbcs-httpd24-libcurl jboss core services 1 8.0.1-1.el8jbcs
  • jbcs-httpd24-mod_ssl jboss core services 1 1:2.4.51-39.el7jbcs
  • jbcs-httpd24-mod_ssl jboss core services 1 1:2.4.51-39.el8jbcs

red hat advisories RHSA-2023:3354RHSA-2023:0970RHSA-2023:0852

  • apache2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.4.66-150400.6.57.1
  • apache2 SLE Module for Server Applications 15 SP4, SLE Module for Package Hub 15 SP4, SLE Module for Basesystem 15 SP4 +1 more 2.4.51-150400.6.6.1
  • apache2 SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +10 more 2.4.51-150200.3.51.1
  • apache2 SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS +1 more 2.4.33-150000.3.72.1
  • apache2 SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 2.4.51-35.22.1
  • apache2 SLES for SAP 12 SP4, SLES 12 SP4-LTSS, SLES 12 SP2-BCL +2 more 2.4.23-29.94.1

suse advisories SUSE-SU-2026:2686-1SUSE-SU-2023:0322-1SUSE-SU-2023:0321-1SUSE-SU-2023:0294-1SUSE-SU-2023:0185-1SUSE-SU-2023:0183-1

  • apache2 openSUSE Tumbleweed 2.4.55-1.1

opensuse advisories openSUSE-SU-2024:12635-1

  • httpd AlmaLinux 9 2.4.53-7.el9_1.1
  • mod_lua AlmaLinux 9 2.4.53-7.el9_1.1
  • mod_ssl AlmaLinux 9 1:2.4.53-7.el9_1.1
  • mod_ldap AlmaLinux 9 2.4.53-7.el9_1.1
  • httpd-core AlmaLinux 9 2.4.53-7.el9_1.1
  • httpd-tools AlmaLinux 9 2.4.53-7.el9_1.1
  • mod_session AlmaLinux 9 2.4.53-7.el9_1.1
  • httpd-manual AlmaLinux 9 2.4.53-7.el9_1.1

almalinux advisories ALSA-2023:0970ALSA-2023:0852

  • httpd Rocky Linux 9 2.4.53-7.el9_1.1
  • httpd Rocky Linux 8 2.4.37-51.module+el8.7.0+1059+126e9251
  • mod_md Rocky Linux 8 1:2.0.8-8.module+el8.5.0+695+1fa8055e
  • mod_http2 Rocky Linux 8 1.15.7-5.module+el8.6.0+823+f143cee1

rocky linux advisories RLSA-2023:0970RLSA-2023:0852

  • apache2 Alpine 3.17, Alpine 3.16, Alpine 3.15 +1 more 2.4.55-r0

alpine advisories ALPINE-CVE-2006-20001

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • apache Arch Linux 2.4.55-1

arch linux advisories AVG-2824

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2006-20001 updated cvss 7.5

httpd: mod_dav: out-of-bounds read/write of zero byte

  • Red Hat Enterprise Linux 6 httpd, mod_ssl, httpd-tools, httpd-manual Red Hat Enterprise Linux 7 httpd, mod_ssl, mod_ldap, httpd-tools, mod_session, httpd-manual, +1 more Red Hat JBoss Enterprise Application Platform 6 httpd22 httpd22 Red Hat Software Collections httpd24-httpd, httpd24-mod_md, httpd24-mod_ssl, httpd24-mod_ldap, httpd24-httpd-tools, httpd24-mod_session, +2 more
    affected: workaround, no fix planned “Disabling mod_dav and restarting httpd will mitigate this flaw.”
  • Red Hat JBCS httpd 2.4.51.sp2
    fixed: vendor fix “Disabling mod_dav and restarting httpd will mitigate this flaw.” RHSA-2023:3355
  • Red Hat Enterprise Linux AppStream (v. 8) mod_md 2.0.8-8.module+el8.3.0+6814+67d1e611, httpd 2.4.37-51.module+el8.7.0+18026+7b169787.1, mod_http2 1.15.7-5.module+el8.6.0+13996+01710940, mod_ssl 2.4.37-51.module+el8.7.0+18026+7b169787.1, mod_ldap 2.4.37-51.module+el8.7.0+18026+7b169787.1, httpd-tools 2.4.37-51.module+el8.7.0+18026+7b169787.1, +4 more
    fixed: vendor fix “Disabling mod_dav and restarting httpd will mitigate this flaw.” RHSA-2023:0852
  • Red Hat Enterprise Linux AppStream (v. 9) httpd 2.4.53-7.el9_1.1, mod_lua 2.4.53-7.el9_1.1, mod_ssl 2.4.53-7.el9_1.1, mod_ldap 2.4.53-7.el9_1.1, httpd-core 2.4.53-7.el9_1.1, httpd-tools 2.4.53-7.el9_1.1, +4 more
    fixed: vendor fix “Disabling mod_dav and restarting httpd will mitigate this flaw.” RHSA-2023:0970
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-httpd 2.4.51-39.el7jbcs, jbcs-httpd24-mod_ssl 2.4.51-39.el7jbcs, jbcs-httpd24-mod_ldap 2.4.51-39.el7jbcs, jbcs-httpd24-httpd-tools 2.4.51-39.el7jbcs, jbcs-httpd24-mod_session 2.4.51-39.el7jbcs, jbcs-httpd24-httpd-manual 2.4.51-39.el7jbcs, +2 more Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-httpd 2.4.51-39.el8jbcs, jbcs-httpd24-mod_ssl 2.4.51-39.el8jbcs, jbcs-httpd24-mod_ldap 2.4.51-39.el8jbcs, jbcs-httpd24-httpd-tools 2.4.51-39.el8jbcs, jbcs-httpd24-mod_session 2.4.51-39.el8jbcs, jbcs-httpd24-httpd-manual 2.4.51-39.el8jbcs, +2 more
    fixed: vendor fix “Disabling mod_dav and restarting httpd will mitigate this flaw.” RHSA-2023:3354
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-curl 8.0.1-1.el7jbcs, jbcs-httpd24-libcurl 8.0.1-1.el7jbcs, jbcs-httpd24-mod_md 2.4.0-20.el7jbcs, jbcs-httpd24-openssl 1.1.1k-14.el7jbcs, jbcs-httpd24-apr-util 1.6.1-101.el7jbcs, jbcs-httpd24-mod_http2 1.15.19-23.el7jbcs, +15 more Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-curl 8.0.1-1.el8jbcs, jbcs-httpd24-libcurl 8.0.1-1.el8jbcs, jbcs-httpd24-mod_md 2.4.0-20.el8jbcs, jbcs-httpd24-openssl 1.1.1k-14.el8jbcs, jbcs-httpd24-apr-util 1.6.1-101.el8jbcs, jbcs-httpd24-mod_http2 1.15.19-23.el8jbcs, +15 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-26-027-02 updated cvss 7.5

Festo Didactic SE MES PC

  • Festo Didactic SE MES PC shipped_with_Windows_10
    affected: vendor fix

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-25-133-01 updated cvss 7.5

Hitachi Energy Service Suite

  • Hitachi Energy Service Suite <=9.8.1.3
    affected: fixed in 9.8.1.4
  • Hitachi Energy Service Suite 9.8.1.4
    fixed

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-24-046-11 updated cvss 7.5

Siemens SCALANCE XCM-/XRM-300

  • Siemens SCALANCE XCH328 (6GK5328-4TS01-2EC2) <V2.4 Siemens SCALANCE XCM324 (6GK5324-8TS01-2AC2) <V2.4 Siemens SCALANCE XCM328 (6GK5328-4TS01-2AC2) <V2.4 Siemens SCALANCE XCM332 (6GK5332-0GA01-2AC2) <V2.4 Siemens SCALANCE XRH334 (24 V DC, 8xFO, CC) (6GK5334-2TS01-2ER3) <V2.4 Siemens SCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3) <V2.4
    +5 more products
    Siemens SCALANCE XRM334 (2x230 V AC, 12xFO) (6GK5334-3TS01-4AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 8xFO) (6GK5334-2TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 12xFO) (6GK5334-3TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 8xFO) (6GK5334-2TS01-3AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 12xFO) (6GK5334-3TS01-3AR3) <V2.4
    affected: fixed in V2.4 support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

3.58% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Apache Software Foundation Apache HTTP Server

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.