Apache HTTP Server: mod_dav out of bounds read, or write of zero byte
Published Jan 17, 2023
7.5
HIGHCVSS 3.1
EPSS 3.55%
Description
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.
Affected products
-
- Version 2.4StatusaffectedConstraints<=2.4.54
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | unaffected |
|
- < 2.4.55
No data.
JBoss Core Services for RHEL 8
jbcs-httpd24-httpd-0:2.4.51-39.el8jbcs
Fixed · RHSA-2023:3354
JBoss Core Services on RHEL 7
jbcs-httpd24-httpd-0:2.4.51-39.el7jbcs
Fixed · RHSA-2023:3354
Red Hat Enterprise Linux 8
httpd:2.4-8070020230131172653.bd1311ed
Fixed · RHSA-2023:0852
Red Hat Enterprise Linux 9
httpd-0:2.4.53-7.el9_1.1
Fixed · RHSA-2023:0970
Red Hat Enterprise Linux 6
httpd
Out of support scope
Red Hat Enterprise Linux 7
httpd
Out of support scope
Red Hat JBoss Enterprise Application Platform 6
httpd22
Out of support scope
Red Hat Software Collections
httpd24-httpd
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| JBoss Core Services for RHEL 8 | jbcs-httpd24-httpd-0:2.4.51-39.el8jbcs | Fixed | RHSA-2023:3354 |
| JBoss Core Services on RHEL 7 | jbcs-httpd24-httpd-0:2.4.51-39.el7jbcs | Fixed | RHSA-2023:3354 |
| Red Hat Enterprise Linux 8 | httpd:2.4-8070020230131172653.bd1311ed | Fixed | RHSA-2023:0852 |
| Red Hat Enterprise Linux 9 | httpd-0:2.4.53-7.el9_1.1 | Fixed | RHSA-2023:0970 |
| Red Hat Enterprise Linux 6 | httpd | Out of support scope | n/a |
| Red Hat Enterprise Linux 7 | httpd | Out of support scope | n/a |
| Red Hat JBoss Enterprise Application Platform 6 | httpd22 | Out of support scope | n/a |
| Red Hat Software Collections | httpd24-httpd | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This flaw only affects configurations with mod_dav loaded and configured. Also, if there is no WebDAV repository configured, the server is not affected and no further mitigation is needed. For more information about the mitigation, check the mitigation section below. The httpd mod_dav module is enabled by default on Red Hat Enterprise Linux 6, 7, 8, 9, and in RHSCL. However, there is no WebDAV repository configured by default. This flaw has been rated as having a security impact of moderate, and is not currently planned to be addressed in future updates of Red Hat Enterprise Linux 7. Red Hat Enterprise Linux 7 is now in Maintenance Support 2 Phase of the support and maintenance life cycle. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata.
Red Hat mitigation
Disabling mod_dav and restarting httpd will mitigate this flaw.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Aug 1, 2024 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2023–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (20 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 3.55% (0.03546) | 88.93th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.55% (0.03546) | 87.76th | v5 (v2026.06.15) |
| Mar 30, 2025 | 0.72% (0.00719) | 70.13th | v4 (v2025.03.14) |
| Mar 29, 2025 | 29.87% (0.29874) | 94.70th | v4 (v2025.03.14) |
| Mar 28, 2025 | 0.72% (0.00719) | 70.14th | v4 (v2025.03.14) |
| Mar 27, 2025 | 17.31% (0.17313) | 94.17th | v4 (v2025.03.14) |
| Mar 25, 2025 | 6.22% (0.06221) | 89.89th | v4 (v2025.03.14) |
| Mar 24, 2025 | 4.23% (0.04227) | 87.69th | v4 (v2025.03.14) |
| Mar 20, 2025 | 6.22% (0.06221) | 90.05th | v4 (v2025.03.14) |
| Mar 19, 2025 | 23.14% (0.23144) | 95.24th | v4 (v2025.03.14) |
| Mar 18, 2025 | 4.23% (0.04227) | 88.06th | v4 (v2025.03.14) |
| Mar 17, 2025 | 6.22% (0.06221) | 90.18th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.09% (0.00091) | 40.74th | v3 (v2023.03.01) |
| Feb 19, 2024 | 0.13% (0.00125) | 45.95th | v3 (v2023.03.01) |
| Jan 24, 2024 | 0.16% (0.00158) | 52.36th | v3 (v2023.03.01) |
| Jan 13, 2024 | 0.06% (0.00062) | 24.80th | v3 (v2023.03.01) |
| Jul 25, 2023 | 0.04% (0.00044) | 10.39th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00044) | 8.35th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Jan 18, 2023 | 0.89% (0.00885) | 27.37th | v2 (v2022.01.01) |
References (8)
- https://access.redhat.com/security/cve/CVE-2006-20001 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2161774 Issue Tracking
- https://httpd.apache.org/security/vulnerabilities_24.html vendor-advisoryRelease NotesVendor Advisory
- https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2006-20001
- https://nvd.nist.gov/vuln/detail/CVE-2006-20001
- https://security.gentoo.org/glsa/202309-01
- https://security.netapp.com/advisory/ntap-20230316-0005/
- https://www.cve.org/CVERecord?id=CVE-2006-20001
Change history (0)
No recorded changes yet.