httpd: http 0.9 request bypass of the reverse proxy vulnerability CVE-2011-3368 fix
Published Nov 30, 2011
4.3
MEDIUMCVSS 2.0
EPSS 50.60%
Description
The mod_proxy module in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x before 2.2.18, when the Revision 1179239 patch is in place, does not properly interact with use of (1) RewriteRule and (2) ProxyPassMatch pattern matches for configuration of a reverse proxy, which allows remote attackers to send requests to intranet servers by using the HTTP/0.9 protocol with a malformed URI containing an initial @ (at sign) character. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.
Affected products
No data.
- 2.0.11
- 2.0.12
- 2.0.13
- 2.0.14
- 2.0.15
- 2.0.16
- 2.0.17
- 2.0.18
- 2.0.19
- 2.0.20
- 2.0.21
- 2.0.22
- 2.0.23
- 2.0.24
- 2.0.25
- 2.0.26
- 2.0.27
- 2.0.28
- 2.0.29
- 2.0.30
- 2.0.31
- 2.0.32
- 2.0.33
- 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
- 2.0.61
- 2.0.63
- 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
- 2.2.14
- 2.2.15
- 2.2.16
- 2.2.17
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
No data.
Red Hat Enterprise Linux 5
httpd-0:2.2.3-63.el5_8.1
Fixed · RHSA-2012:0323
Red Hat Enterprise Linux 6
httpd-0:2.2.15-15.el6_2.1
Fixed · RHSA-2012:0128
Red Hat Directory Server 8
httpd
Not affected
Red Hat Enterprise Linux 4
httpd
Will not fix
Red Hat JBoss Enterprise Web Server 1
httpd
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | httpd-0:2.2.3-63.el5_8.1 | Fixed | RHSA-2012:0323 |
| Red Hat Enterprise Linux 6 | httpd-0:2.2.15-15.el6_2.1 | Fixed | RHSA-2012:0128 |
| Red Hat Directory Server 8 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 4 | httpd | Will not fix | n/a |
| Red Hat JBoss Enterprise Web Server 1 | httpd | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
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:M/Au:N/C:N/I:P/A:N
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 (52 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 50.60% (0.50604) | 98.89th | v5 (v2026.06.15) |
| Jul 15, 2026 | 50.60% (0.50604) | 98.79th | v5 (v2026.06.15) |
| Jun 15, 2026 | 52.53% (0.52531) | 98.82th | v5 (v2026.06.15) |
| May 13, 2026 | 9.76% (0.09764) | 93.03th | v4 (v2025.03.14) |
| Mar 19, 2026 | 8.62% (0.08615) | 92.33th | v4 (v2025.03.14) |
| Mar 4, 2026 | 11.22% (0.11217) | 93.37th | v4 (v2025.03.14) |
| Mar 1, 2026 | 13.11% (0.13115) | 94.01th | v4 (v2025.03.14) |
| Feb 4, 2026 | 11.22% (0.11217) | 93.32th | v4 (v2025.03.14) |
| Feb 1, 2026 | 13.11% (0.13115) | 93.96th | v4 (v2025.03.14) |
| Jan 4, 2026 | 11.22% (0.11217) | 93.27th | v4 (v2025.03.14) |
| Jan 1, 2026 | 15.41% (0.15406) | 94.47th | v4 (v2025.03.14) |
| Dec 28, 2025 | 13.24% (0.13240) | 93.91th | v4 (v2025.03.14) |
| Dec 27, 2025 | 24.81% (0.24806) | 95.98th | v4 (v2025.03.14) |
| Dec 10, 2025 | 13.24% (0.13240) | 93.88th | v4 (v2025.03.14) |
| Dec 4, 2025 | 14.88% (0.14881) | 94.26th | v4 (v2025.03.14) |
| Dec 1, 2025 | 16.68% (0.16676) | 94.72th | v4 (v2025.03.14) |
| Nov 4, 2025 | 14.88% (0.14881) | 94.23th | v4 (v2025.03.14) |
| Nov 1, 2025 | 16.68% (0.16676) | 94.69th | v4 (v2025.03.14) |
| Oct 28, 2025 | 14.88% (0.14881) | 94.22th | v4 (v2025.03.14) |
| Oct 27, 2025 | 24.81% (0.24806) | 95.91th | v4 (v2025.03.14) |
| Oct 21, 2025 | 14.88% (0.14881) | 94.22th | v4 (v2025.03.14) |
| Oct 4, 2025 | 21.15% (0.21153) | 95.46th | v4 (v2025.03.14) |
| Oct 1, 2025 | 23.45% (0.23452) | 95.80th | v4 (v2025.03.14) |
| Sep 4, 2025 | 33.14% (0.33139) | 96.77th | v4 (v2025.03.14) |
| Sep 1, 2025 | 30.63% (0.30630) | 96.59th | v4 (v2025.03.14) |
| Aug 4, 2025 | 33.14% (0.33139) | 96.73th | v4 (v2025.03.14) |
| Aug 1, 2025 | 30.63% (0.30630) | 96.57th | v4 (v2025.03.14) |
| Jul 31, 2025 | 33.14% (0.33139) | 96.73th | v4 (v2025.03.14) |
| Jul 30, 2025 | 26.17% (0.26175) | 96.07th | v4 (v2025.03.14) |
| Jul 4, 2025 | 15.95% (0.15953) | 94.46th | v4 (v2025.03.14) |
| Jul 1, 2025 | 17.84% (0.17844) | 94.86th | v4 (v2025.03.14) |
| Jun 4, 2025 | 15.95% (0.15953) | 94.41th | v4 (v2025.03.14) |
| Jun 1, 2025 | 17.84% (0.17844) | 94.82th | v4 (v2025.03.14) |
| May 4, 2025 | 15.95% (0.15953) | 94.35th | v4 (v2025.03.14) |
| May 1, 2025 | 17.84% (0.17844) | 94.79th | v4 (v2025.03.14) |
| Mar 30, 2025 | 15.95% (0.15953) | 94.20th | v4 (v2025.03.14) |
| Mar 29, 2025 | 22.82% (0.22825) | 93.35th | v4 (v2025.03.14) |
| Mar 17, 2025 | 15.95% (0.15953) | 94.26th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.32% (0.01319) | 86.54th | v3 (v2023.03.01) |
| Jul 20, 2024 | 1.50% (0.01497) | 87.03th | v3 (v2023.03.01) |
| May 30, 2024 | 2.14% (0.02136) | 89.24th | v3 (v2023.03.01) |
| Feb 12, 2024 | 3.50% (0.03505) | 91.20th | v3 (v2023.03.01) |
| Oct 25, 2023 | 3.96% (0.03956) | 91.00th | v3 (v2023.03.01) |
| Aug 28, 2023 | 2.83% (0.02830) | 89.36th | v3 (v2023.03.01) |
| Jun 29, 2023 | 2.27% (0.02271) | 88.06th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.81% (0.01813) | 86.27th | v3 (v2023.03.01) |
| Mar 6, 2023 | 5.48% (0.05476) | 90.00th | v2 (v2022.01.01) |
| Feb 13, 2023 | 5.48% (0.05476) | 89.66th | v2 (v2022.01.01) |
| Feb 3, 2023 | 16.42% (0.16417) | 95.99th | v2 (v2022.01.01) |
| Apr 1, 2022 | 5.48% (0.05476) | 89.03th | v2 (v2022.01.01) |
| Feb 12, 2022 | 5.48% (0.05476) | 76.84th | v2 (v2022.01.01) |
| Feb 4, 2022 | 6.49% (0.06495) | 78.05th | v2 (v2022.01.01) |
References (7)
- http://rhn.redhat.com/errata/RHSA-2012-0128.html vendor-advisoryx_refsource_REDHAT
- http://svn.apache.org/viewvc?view=revision&revision=1188745 x_refsource_CONFIRM
- http://www.debian.org/security/2012/dsa-2405 vendor-advisoryx_refsource_DEBIAN
- https://access.redhat.com/security/cve/CVE-2011-3639 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=752080 x_refsource_CONFIRMIssue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2011-3639
- https://www.cve.org/CVERecord?id=CVE-2011-3639
| Link | Providers | Tags |
|---|---|---|
| http://rhn.redhat.com/errata/RHSA-2012-0128.html | vendor-advisoryx_refsource_REDHAT | |
| http://svn.apache.org/viewvc?view=revision&revision=1188745 | x_refsource_CONFIRM | |
| http://www.debian.org/security/2012/dsa-2405 | vendor-advisoryx_refsource_DEBIAN | |
| https://access.redhat.com/security/cve/CVE-2011-3639 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=752080 | x_refsource_CONFIRMIssue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2011-3639 | ||
| https://www.cve.org/CVERecord?id=CVE-2011-3639 |
Change history (0)
No recorded changes yet.