httpd: Apache Slowloris denial of service
Published Dec 27, 2011
5.0
MEDIUMCVSS 2.0
EPSS 70.53%
Description
The Apache HTTP Server 1.x and 2.x allows remote attackers to cause a denial of service (daemon outage) via partial HTTP requests, as demonstrated by Slowloris, related to the lack of the mod_reqtimeout module in versions before 2.2.15.
Affected products
No data.
- ≤ 2.2.14
- 1.0
- 1.0.2
- 1.0.3
- 1.0.5
- 1.1
- 1.1.1
- 1.2
- 1.2.4
- 1.2.5
- 1.2.6
- 1.2.9
- 1.3
- 1.3.0
- 1.3.1
- 1.3.1.1
- 1.3.2
- 1.3.3
- 1.3.4
- 1.3.5
- 1.3.6
- 1.3.7
- 1.3.8
- 1.3.9
- 1.3.10
- 1.3.11
- 1.3.12
- 1.3.13
- 1.3.14
- 1.3.15
- 1.3.16
- 1.3.17
- 1.3.18
- 1.3.19
- 1.3.20
- 1.3.22
- 1.3.23
- 1.3.24
- 1.3.25
- 1.3.26
- 1.3.27
- 1.3.28
- 1.3.29
- 1.3.30
- 1.3.31
- 1.3.32
- 1.3.33
- 1.3.34
- 1.3.35
- 1.3.36
- 1.3.37
- 1.3.38
- 1.3.39
- 1.3.41
- 1.3.42
- 1.3.65
- 1.3.68
- 1.4.0
- 1.99
- 2.0
- 2.0.9
- 2.0.28
- 2.0.28
- 2.0.32
- 2.0.32
- 2.0.34
- 2.0.35
- 2.0.36
- 2.0.37
- 2.0.38
- 2.0.39
- 2.0.40
- 2.0.41
- 2.0.42
- 2.0.43
- 2.0.44
- 2.0.45
- 2.0.46
- 2.0.47
- 2.0.48
- 2.0.49
- 2.0.50
- 2.0.51
- 2.0.52
- 2.0.53
- 2.0.54
- 2.0.55
- 2.0.56
- 2.0.57
- 2.0.58
- 2.0.59
- 2.0.60
- 2.0.61
- 2.0.63
- 2.1
- 2.1.1
- 2.1.2
- 2.1.3
- 2.1.4
- 2.1.5
- 2.1.6
- 2.1.7
- 2.1.8
- 2.1.9
- 2.2
- 2.2.0
- 2.2.1
- 2.2.2
- 2.2.3
- 2.2.4
- 2.2.6
- 2.2.8
- 2.2.9
- 2.2.10
- 2.2.11
- 2.2.12
- 2.2.13
No data.
Red Hat Enterprise Linux 4
httpd
Affected
Red Hat Enterprise Linux 5
httpd
Affected
Red Hat Enterprise Linux 6
httpd
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | httpd | Affected | n/a |
| Red Hat Enterprise Linux 5 | httpd | Affected | n/a |
| Red Hat Enterprise Linux 6 | httpd | Affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue affects the version of httpd package as shipped with Red Hat Enterprise Linux 4. This issue is mitigated by the use of mod_reqtimeout module shipped with the httpd package in Red Hat Enterprise Linux 5 and 6.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (18 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 70.53% (0.70525) | 99.37th | v5 (v2026.06.15) |
| Aug 12, 2026 | 70.53% (0.70525) | 99.33th | v5 (v2026.06.15) |
| Jun 15, 2026 | 71.63% (0.71634) | 99.34th | v5 (v2026.06.15) |
| Jan 31, 2026 | 82.53% (0.82529) | 99.20th | v4 (v2025.03.14) |
| Dec 28, 2025 | 83.77% (0.83770) | 99.26th | v4 (v2025.03.14) |
| Dec 27, 2025 | 82.15% (0.82153) | 99.17th | v4 (v2025.03.14) |
| Dec 6, 2025 | 83.77% (0.83770) | 99.24th | v4 (v2025.03.14) |
| Oct 1, 2025 | 88.00% (0.87998) | 99.46th | v4 (v2025.03.14) |
| Jul 30, 2025 | 85.54% (0.85543) | 99.32th | v4 (v2025.03.14) |
| Jul 16, 2025 | 87.65% (0.87652) | 99.42th | v4 (v2025.03.14) |
| Mar 17, 2025 | 89.62% (0.89619) | 99.54th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.70% (0.01696) | 88.25th | v3 (v2023.03.01) |
| Oct 31, 2023 | 1.70% (0.01696) | 86.34th | v3 (v2023.03.01) |
| Jul 8, 2023 | 2.29% (0.02293) | 88.13th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.63% (0.01630) | 85.51th | v3 (v2023.03.01) |
| Mar 6, 2023 | 3.72% (0.03718) | 85.08th | v2 (v2022.01.01) |
| Apr 1, 2022 | 3.72% (0.03718) | 83.56th | v2 (v2022.01.01) |
| Feb 4, 2022 | 3.72% (0.03718) | 66.71th | v2 (v2022.01.01) |
References (15)
- http://archives.neohapsis.com/archives/bugtraq/2007-01/0229.html mailing-listx_refsource_BUGTRAQ
- http://ha.ckers.org/slowloris/ x_refsource_MISC
- http://lists.opensuse.org/opensuse-security-announce/2012-02/msg00026.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2012-03/msg00002.html vendor-advisoryx_refsource_SUSE
- http://marc.info/?l=bugtraq&m=136612293908376&w=2 vendor-advisoryx_refsource_HP
- http://www.securityfocus.com/bid/21865 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1038144 vdb-entryx_refsource_SECTRACK
- https://access.redhat.com/security/cve/CVE-2007-6750 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=508238 Issue Tracking
- https://exchange.xforce.ibmcloud.com/vulnerabilities/72345 vdb-entryx_refsource_XF
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05111017 x_refsource_CONFIRM
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05158380 x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2007-6750
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19481 vdb-entrysignaturex_refsource_OVAL
- https://www.cve.org/CVERecord?id=CVE-2007-6750
Change history (0)
No recorded changes yet.