MEDIUM
httpd: uri scheme bypass of the reverse proxy vulnerability CVE-2011-3368 fix
Published Nov 30, 2011
4.3
MEDIUMCVSS 2.0
EPSS 59.60%
Description
The mod_proxy module in the Apache HTTP Server 1.3.x through 1.3.42, 2.0.x through 2.0.64, and 2.2.x through 2.2.21, 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 via a malformed URI containing an @ (at sign) character and a : (colon) character in invalid positions. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.
Affected products
No data.
Configuration 1
OR
- 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
Configuration 2
OR
- 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
- 2.0.64
Configuration 3
OR
- 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
- 2.2.18
- 2.2.19
- 2.2.20
- 2.2.21
No data.
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
Not affected
Red Hat Enterprise Linux 5
httpd
Not affected
Red Hat JBoss Enterprise Web Server 1
httpd
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| 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 | Not affected | n/a |
| Red Hat Enterprise Linux 5 | httpd | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 1 | httpd | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of httpd as shipped with Red Hat Enterprise Linux 4 and 5 due to differences in apr-util's apr_uri_parse() implementation.
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.
4.3 MEDIUM NVD
AV:N/AC:M/Au:N/C:N/I:P/A:N
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact None
Integrity Impact Partial
Availability Impact None
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
59.60% 0.59603
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.59603
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 (55 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 59.60% (0.59603) | 99.10th | v5 (v2026.06.15) |
| Jul 15, 2026 | 59.60% (0.59603) | 99.02th | v5 (v2026.06.15) |
| Jun 15, 2026 | 60.78% (0.60783) | 99.03th | v5 (v2026.06.15) |
| Jun 8, 2026 | 77.98% (0.77975) | 99.03th | v4 (v2025.03.14) |
| May 29, 2026 | 79.45% (0.79449) | 99.10th | v4 (v2025.03.14) |
| Mar 19, 2026 | 81.92% (0.81918) | 99.19th | v4 (v2025.03.14) |
| Mar 4, 2026 | 84.29% (0.84292) | 99.30th | v4 (v2025.03.14) |
| Mar 1, 2026 | 75.02% (0.75021) | 98.86th | v4 (v2025.03.14) |
| Feb 4, 2026 | 84.29% (0.84292) | 99.29th | v4 (v2025.03.14) |
| Feb 1, 2026 | 75.02% (0.75021) | 98.84th | v4 (v2025.03.14) |
| Jan 4, 2026 | 84.29% (0.84292) | 99.28th | v4 (v2025.03.14) |
| Jan 1, 2026 | 75.02% (0.75021) | 98.84th | v4 (v2025.03.14) |
| Dec 28, 2025 | 84.29% (0.84292) | 99.28th | v4 (v2025.03.14) |
| Dec 27, 2025 | 85.43% (0.85434) | 99.33th | v4 (v2025.03.14) |
| Dec 4, 2025 | 84.29% (0.84292) | 99.27th | v4 (v2025.03.14) |
| Dec 1, 2025 | 75.02% (0.75021) | 98.83th | v4 (v2025.03.14) |
| Nov 4, 2025 | 84.29% (0.84292) | 99.27th | v4 (v2025.03.14) |
| Nov 1, 2025 | 75.02% (0.75021) | 98.82th | v4 (v2025.03.14) |
| Oct 30, 2025 | 82.26% (0.82260) | 99.17th | v4 (v2025.03.14) |
| Oct 28, 2025 | 84.29% (0.84292) | 99.27th | v4 (v2025.03.14) |
| Oct 27, 2025 | 85.43% (0.85434) | 99.32th | v4 (v2025.03.14) |
| Oct 21, 2025 | 82.26% (0.82260) | 99.17th | v4 (v2025.03.14) |
| Oct 11, 2025 | 88.05% (0.88051) | 99.44th | v4 (v2025.03.14) |
| Oct 4, 2025 | 85.30% (0.85298) | 99.32th | v4 (v2025.03.14) |
| Oct 1, 2025 | 81.26% (0.81261) | 99.14th | v4 (v2025.03.14) |
| Sep 26, 2025 | 86.07% (0.86072) | 99.36th | v4 (v2025.03.14) |
| Sep 4, 2025 | 88.88% (0.88879) | 99.50th | v4 (v2025.03.14) |
| Sep 1, 2025 | 83.58% (0.83583) | 99.26th | v4 (v2025.03.14) |
| Aug 4, 2025 | 88.88% (0.88879) | 99.49th | v4 (v2025.03.14) |
| Aug 1, 2025 | 83.58% (0.83583) | 99.25th | v4 (v2025.03.14) |
| Jul 4, 2025 | 89.39% (0.89390) | 99.51th | v4 (v2025.03.14) |
| Jul 1, 2025 | 84.57% (0.84568) | 99.28th | v4 (v2025.03.14) |
| Jun 4, 2025 | 89.39% (0.89390) | 99.52th | v4 (v2025.03.14) |
| Jun 1, 2025 | 84.57% (0.84568) | 99.27th | v4 (v2025.03.14) |
| May 15, 2025 | 88.85% (0.88850) | 99.48th | v4 (v2025.03.14) |
| May 4, 2025 | 90.23% (0.90231) | 99.55th | v4 (v2025.03.14) |
| May 1, 2025 | 87.09% (0.87088) | 99.40th | v4 (v2025.03.14) |
| Mar 30, 2025 | 90.23% (0.90231) | 99.58th | v4 (v2025.03.14) |
| Mar 29, 2025 | 88.89% (0.88895) | 99.42th | v4 (v2025.03.14) |
| Mar 25, 2025 | 90.23% (0.90231) | 99.59th | v4 (v2025.03.14) |
| Mar 17, 2025 | 79.03% (0.79032) | 99.01th | v4 (v2025.03.14) |
| Jan 30, 2025 | 90.12% (0.90117) | 99.08th | v3 (v2023.03.01) |
| Dec 17, 2024 | 91.70% (0.91704) | 99.16th | v3 (v2023.03.01) |
| Dec 12, 2024 | 93.33% (0.93333) | 99.19th | v3 (v2023.03.01) |
| Jul 20, 2024 | 94.21% (0.94214) | 99.21th | v3 (v2023.03.01) |
| May 30, 2024 | 92.85% (0.92846) | 99.02th | v3 (v2023.03.01) |
| Apr 7, 2024 | 93.69% (0.93695) | 99.08th | v3 (v2023.03.01) |
| Dec 18, 2023 | 94.35% (0.94353) | 99.01th | v3 (v2023.03.01) |
| Oct 25, 2023 | 94.43% (0.94426) | 98.96th | v3 (v2023.03.01) |
| Jun 29, 2023 | 95.56% (0.95557) | 99.08th | v3 (v2023.03.01) |
| Apr 26, 2023 | 95.74% (0.95741) | 99.06th | v3 (v2023.03.01) |
| Mar 7, 2023 | 95.66% (0.95658) | 98.98th | v3 (v2023.03.01) |
| Mar 6, 2023 | 68.09% (0.68093) | 99.11th | v2 (v2022.01.01) |
| Feb 12, 2022 | 68.09% (0.68093) | 98.94th | v2 (v2022.01.01) |
| Feb 4, 2022 | 68.84% (0.68845) | 98.95th | v2 (v2022.01.01) |
Weaknesses (1)
References (36)
- http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041 vendor-advisoryx_refsource_HP
- http://kb.juniper.net/JSA10585 x_refsource_CONFIRM
- http://lists.apple.com/archives/security-announce/2012/Sep/msg00004.html vendor-advisoryx_refsource_APPLE
- http://lists.opensuse.org/opensuse-updates/2013-02/msg00009.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-updates/2013-02/msg00012.html vendor-advisoryx_refsource_SUSE
- http://marc.info/?l=bugtraq&m=133294460209056&w=2 vendor-advisoryx_refsource_HP
- http://marc.info/?l=bugtraq&m=134987041210674&w=2 vendor-advisoryx_refsource_HP
- http://rhn.redhat.com/errata/RHSA-2012-0128.html vendor-advisoryx_refsource_REDHAT
- http://secunia.com/advisories/48551 third-party-advisoryx_refsource_SECUNIA
- http://support.apple.com/kb/HT5501 x_refsource_CONFIRM
- http://thread.gmane.org/gmane.comp.apache.devel/46440 x_refsource_CONFIRMExploit
- http://www.debian.org/security/2012/dsa-2405 vendor-advisoryx_refsource_DEBIAN
- http://www.mandriva.com/security/advisories?name=MDVSA-2012:003 vendor-advisoryx_refsource_MANDRIVA
- http://www.mandriva.com/security/advisories?name=MDVSA-2013:150 vendor-advisoryx_refsource_MANDRIVA
- http://www.oracle.com/technetwork/topics/security/cpujan2015-1972971.html x_refsource_CONFIRM
- http://www.oracle.com/technetwork/topics/security/cpujul2012-392727.html x_refsource_CONFIRM
- http://www.securitytracker.com/id?1026353 vdb-entryx_refsource_SECTRACK
- https://access.redhat.com/security/cve/CVE-2011-4317 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=756483 x_refsource_CONFIRMIssue Tracking
- https://community.qualys.com/blogs/securitylabs/2011/11/23/apache-reverse-proxy-bypass-issue x_refsource_MISCExploit
- https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r05b5357d1f6bd106f41541ee7d87aafe3f5ea4dc3e9bde5ce09baff8%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r1d201e3da31a2c8aa870c8314623caef7debd74a13d0f25205e26f15%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/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r9b4b963760a3cb5a4a70c902f325c6c0337fe51d5b8570416f8f8729%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%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/rad01d817195e6cc871cb1d73b207ca326379a20a6e7f30febaf56d24%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%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://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2011-4317
- https://www.cve.org/CVERecord?id=CVE-2011-4317
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner redhat
Published Nov 30, 2011
Updated Aug 7, 2024
Reserved Nov 4, 2011
Link CVE-2011-4317
CISA Vulnrichment
Updated n/a