httpd: WinNT MPM denial of service
Published Jul 20, 2014
7.5
HIGHCVSS 3.0
EPSS 16.37%
Description
Memory leak in the winnt_accept function in server/mpm/winnt/child.c in the WinNT MPM in the Apache HTTP Server 2.4.x before 2.4.10 on Windows, when the default AcceptFilter is enabled, allows remote attackers to cause a denial of service (memory consumption) via crafted requests.
Affected products
No data.
- 2.4.1
- 2.4.2
- 2.4.3
- 2.4.4
- 2.4.6
- 2.4.7
- 2.4.8
- 2.4.9
No data.
Red Hat JBoss Core Services
n/a
Fixed · RHSA-2016:2957
Red Hat Directory Server 8
httpd
Not affected
Red Hat Enterprise Linux 5
httpd
Not affected
Red Hat Enterprise Linux 6
httpd
Not affected
Red Hat Enterprise Linux 7
httpd
Not affected
Red Hat JBoss Enterprise Application Platform 5
httpd
Not affected
Red Hat JBoss Enterprise Application Platform 6
httpd
Not affected
Red Hat JBoss Enterprise Web Server 1
httpd
Not affected
Red Hat JBoss Enterprise Web Server 2
httpd
Not affected
Red Hat Software Collections
httpd24-httpd
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat JBoss Core Services | n/a | Fixed | RHSA-2016:2957 |
| Red Hat Directory Server 8 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 5 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 6 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 7 | httpd | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 5 | httpd | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 6 | httpd | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 1 | httpd | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 2 | httpd | Not affected | n/a |
| Red Hat Software Collections | httpd24-httpd | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Not affected. This issue did not affect the versions of httpd as shipped with Red Hat Enterprise Linux 5, 6 and 7, Red Hat JBoss Web Server 1 and 2, and Red Hat JBoss Enterprise Application Platform 5 and 6. This flaw only affects httpd running on Microsoft Windows. Red Hat JBoss Web Server 1 and 2, and Red Hat JBoss Enterprise Application Platform 5 and 6 can be run on Microsoft Windows. However, these products provide httpd 2.2, which is not affected by this flaw.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 3, 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 (42 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 16.37% (0.16372) | 96.88th | v5 (v2026.06.15) |
| Jun 15, 2026 | 16.37% (0.16372) | 96.55th | v5 (v2026.06.15) |
| Mar 4, 2026 | 35.23% (0.35235) | 96.96th | v4 (v2025.03.14) |
| Mar 1, 2026 | 27.62% (0.27624) | 96.36th | v4 (v2025.03.14) |
| Feb 4, 2026 | 35.23% (0.35235) | 96.92th | v4 (v2025.03.14) |
| Feb 1, 2026 | 27.62% (0.27624) | 96.33th | v4 (v2025.03.14) |
| Jan 4, 2026 | 35.23% (0.35235) | 96.89th | v4 (v2025.03.14) |
| Jan 1, 2026 | 27.62% (0.27624) | 96.30th | v4 (v2025.03.14) |
| Dec 28, 2025 | 35.23% (0.35235) | 96.89th | v4 (v2025.03.14) |
| Dec 27, 2025 | 44.45% (0.44449) | 97.45th | v4 (v2025.03.14) |
| Dec 4, 2025 | 35.23% (0.35235) | 96.86th | v4 (v2025.03.14) |
| Dec 1, 2025 | 27.62% (0.27624) | 96.27th | v4 (v2025.03.14) |
| Nov 4, 2025 | 35.23% (0.35235) | 96.84th | v4 (v2025.03.14) |
| Nov 1, 2025 | 27.62% (0.27624) | 96.24th | v4 (v2025.03.14) |
| Oct 28, 2025 | 35.23% (0.35235) | 96.84th | v4 (v2025.03.14) |
| Oct 27, 2025 | 44.45% (0.44449) | 97.41th | v4 (v2025.03.14) |
| Oct 4, 2025 | 35.23% (0.35235) | 96.91th | v4 (v2025.03.14) |
| Oct 1, 2025 | 27.62% (0.27624) | 96.29th | v4 (v2025.03.14) |
| Sep 4, 2025 | 44.45% (0.44449) | 97.48th | v4 (v2025.03.14) |
| Sep 1, 2025 | 23.76% (0.23764) | 95.83th | v4 (v2025.03.14) |
| Aug 4, 2025 | 44.45% (0.44449) | 97.45th | v4 (v2025.03.14) |
| Aug 1, 2025 | 23.76% (0.23764) | 95.81th | v4 (v2025.03.14) |
| Jul 30, 2025 | 44.45% (0.44449) | 97.45th | v4 (v2025.03.14) |
| Jul 4, 2025 | 35.23% (0.35235) | 96.85th | v4 (v2025.03.14) |
| Jul 1, 2025 | 27.62% (0.27624) | 96.22th | v4 (v2025.03.14) |
| Jun 4, 2025 | 35.23% (0.35235) | 96.83th | v4 (v2025.03.14) |
| Jun 1, 2025 | 27.62% (0.27624) | 96.18th | v4 (v2025.03.14) |
| May 4, 2025 | 35.23% (0.35235) | 96.79th | v4 (v2025.03.14) |
| May 1, 2025 | 20.40% (0.20400) | 95.20th | v4 (v2025.03.14) |
| Mar 30, 2025 | 22.84% (0.22841) | 95.41th | v4 (v2025.03.14) |
| Mar 29, 2025 | 25.43% (0.25427) | 93.89th | v4 (v2025.03.14) |
| Mar 17, 2025 | 22.84% (0.22841) | 95.43th | v4 (v2025.03.14) |
| Dec 17, 2024 | 14.08% (0.14077) | 95.66th | v3 (v2023.03.01) |
| Sep 5, 2024 | 5.22% (0.05225) | 93.17th | v3 (v2023.03.01) |
| Mar 1, 2024 | 4.09% (0.04089) | 91.88th | v3 (v2023.03.01) |
| Jan 14, 2024 | 5.68% (0.05679) | 92.56th | v3 (v2023.03.01) |
| Jun 27, 2023 | 5.64% (0.05643) | 92.16th | v3 (v2023.03.01) |
| Mar 27, 2023 | 4.95% (0.04949) | 91.55th | v3 (v2023.03.01) |
| Mar 7, 2023 | 3.55% (0.03554) | 90.14th | v3 (v2023.03.01) |
| Mar 6, 2023 | 7.34% (0.07344) | 92.59th | v2 (v2022.01.01) |
| Apr 1, 2022 | 7.34% (0.07344) | 91.87th | v2 (v2022.01.01) |
| Feb 4, 2022 | 7.34% (0.07344) | 80.64th | v2 (v2022.01.01) |
References (25)
- http://httpd.apache.org/security/vulnerabilities_24.html x_refsource_CONFIRMPatchVendor Advisory
- http://marc.info/?l=bugtraq&m=143748090628601&w=2 vendor-advisoryx_refsource_HP
- http://marc.info/?l=bugtraq&m=144050155601375&w=2 vendor-advisoryx_refsource_HP
- http://rhn.redhat.com/errata/RHSA-2016-2957.html vendor-advisoryx_refsource_REDHAT
- http://svn.apache.org/viewvc/httpd/httpd/trunk/server/mpm/winnt/child.c x_refsource_CONFIRM
- http://svn.apache.org/viewvc/httpd/httpd/trunk/server/mpm/winnt/child.c?r1=1608785&r2=1610652&diff_format=h x_refsource_CONFIRM
- http://www.securityfocus.com/bid/68747 vdb-entryx_refsource_BID
- https://access.redhat.com/security/cve/CVE-2014-3523 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1121519 Issue Tracking
- https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r476d175be0aaf4a17680ef98c5153b4d336eaef76fb2224cc94c463a%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r83109088737656fa6307bd99ab40f8ff0269ae58d3f7272d7048494a%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r9821b0a32a1d0a1b4947abb6f3630053fcbb2ec905d9a32c2bd4d4ee%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/ra7f6aeb28661fbf826969526585f16856abc4615877875f9d3b35ef4%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rcc44594d4d6579b90deccd4536b5d31f099ef563df39b094be286b9e%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rd336919f655b7ff309385e34a143e41c503e133da80414485b3abcc9%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2014-3523
- https://www.cve.org/CVERecord?id=CVE-2014-3523
Change history (0)
No recorded changes yet.