CVE-2011-3607
Integer overflow in the ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x...
4.4 MediumPublic exploitFix available
CVE-2011-3607 is a medium vulnerability (CVSS 4.4) in Apache Http Server, published November 8, 2011. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 4.90%, the 92nd percentile. Fixed in apache2 2.2.21-4.
Integer overflow in the ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the mod_setenvif module is enabled, allows local users to gain privileges via a .htaccess file with a crafted SetEnvIf directive, in conjunction with a crafted HTTP request header, leading to a heap-based buffer overflow.
Exploit likelihood
4.90%Up 1.9 points since Feb 4, 2022
What each source reports
NVD Score used
Integer overflow in the ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the mod_setenvif module is enabled, allows local users to gain privileges via a .htaccess file with a crafted SetEnvIf directive, in conjunction with a crafted HTTP request header, leading to a heap-based buffer overflow.
- Record
CVE-2011-3607- CVSS 2.0
- 4.4 Medium
AV:L/AC:M/Au:N/C:P/I:P/A:P - Weakness
- CWE-189
- Updated
- 2026-11-02
CVE List No score
Integer overflow in the ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the mod_setenvif module is enabled, allows local users to gain privileges via a .htaccess file with a crafted SetEnvIf directive, in conjunction with a crafted HTTP request header, leading to a heap-based buffer overflow.
- Record
CVE-2011-3607- Updated
- 2026-11-02
EUVDEUVD-2011-3566 No score
Integer overflow in the ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the mod_setenvif module is enabled, allows local users to gain privileges via a .htaccess file with a crafted SetEnvIf directive, in conjunction with a crafted HTTP request header, leading to a heap-based buffer overflow.
- Record
EUVD-2011-3566- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-chqj-ghv5-hm5m No score
Integer overflow in the ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x...
Integer overflow in the ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the mod_setenvif module is enabled, allows local users to gain privileges via a .htaccess file with a crafted SetEnvIf directive, in conjunction with a crafted HTTP request header, leading to a heap-based buffer overflow.
- Record
GHSA-chqj-ghv5-hm5m- Updated
- 2026-11-02
OSVBELL-CVE-2011-3607
CVE-2011-3607 does not affect BellSoft software
- Record
BELL-CVE-2011-3607- CVSS 2.0
- 4.4 Medium
AV:L/AC:M/Au:N/C:P/I:P/A:P - Updated
- 2026-11-02
OSV No score
Integer overflow in the ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the mod_setenvif module is enabled, allows local users to gain privileges via a .htaccess file with a crafted SetEnvIf directive, in conjunction with a crafted HTTP request header, leading to a heap-based buffer overflow.
- Record
CVE-2011-3607- Updated
- 2026-11-02
OSVDEBIAN-CVE-2011-3607 No score
Integer overflow in the ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the mod_setenvif module is enabled, allows local users to gain privileges via a .htaccess file with a crafted SetEnvIf directive, in conjunction with a crafted HTTP request header, leading to a heap-based buffer overflow.
- Record
DEBIAN-CVE-2011-3607- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:10268-1 No score
apache2-2.4.23-4.1 on GA media
These are all security issues fixed in the apache2-2.4.23-4.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:10268-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
apache2Debian:12 |
before 2.2.21-4 | 2.2.21-4 |
apache2Debian:13 |
before 2.2.21-4 | 2.2.21-4 |
apache2Debian:14 |
before 2.2.21-4 | 2.2.21-4 |
apache2Debian:6.0 |
before 2.2.16-6+squeeze6, plus listed versions 2.2.16-62.2.16-6+squeeze12.2.16-6+squeeze1~bpo50+12.2.16-6+squeeze22.2.16-6+squeeze2~bpo50+12.2.16-6+squeeze32.2.16-6+squeeze42.2.16-6+squeeze4~bpo50+1 |
2.2.16-6+squeeze6 |
apache2Debian:5.0 |
before 2.2.9-10+lenny12, plus listed versions 2.2.9-10+lenny102.2.9-10+lenny112.2.9-10+lenny22.2.9-10+lenny32.2.9-10+lenny4 Show 5 moreShow less2.2.9-10+lenny52.2.9-10+lenny62.2.9-10+lenny72.2.9-10+lenny82.2.9-10+lenny9 |
2.2.9-10+lenny12 |
httpdRed Hat:enterprise_linux:6::client |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
httpd-debuginfoRed Hat:enterprise_linux:6::client |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
httpd-toolsRed Hat:enterprise_linux:6::client |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
httpd-develRed Hat:enterprise_linux:6::client |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
httpd-manualRed Hat:enterprise_linux:6::client |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
Show 41 moreShow less
| Package | Affected | Fixed |
|---|---|---|
mod_sslRed Hat:enterprise_linux:6::client |
before 1:2.2.15-15.el6_2.1 | 1:2.2.15-15.el6_2.1 |
httpdRed Hat:enterprise_linux:6::computenode |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
httpd-debuginfoRed Hat:enterprise_linux:6::computenode |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
httpd-toolsRed Hat:enterprise_linux:6::computenode |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
httpd-develRed Hat:enterprise_linux:6::computenode |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
httpd-manualRed Hat:enterprise_linux:6::computenode |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
mod_sslRed Hat:enterprise_linux:6::computenode |
before 1:2.2.15-15.el6_2.1 | 1:2.2.15-15.el6_2.1 |
httpdRed Hat:enterprise_linux:6::server |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
httpd-debuginfoRed Hat:enterprise_linux:6::server |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
httpd-develRed Hat:enterprise_linux:6::server |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
httpd-manualRed Hat:enterprise_linux:6::server |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
httpd-toolsRed Hat:enterprise_linux:6::server |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
mod_sslRed Hat:enterprise_linux:6::server |
before 1:2.2.15-15.el6_2.1 | 1:2.2.15-15.el6_2.1 |
httpdRed Hat:enterprise_linux:6::workstation |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
httpd-debuginfoRed Hat:enterprise_linux:6::workstation |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
httpd-develRed Hat:enterprise_linux:6::workstation |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
httpd-manualRed Hat:enterprise_linux:6::workstation |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
httpd-toolsRed Hat:enterprise_linux:6::workstation |
before 0:2.2.15-15.el6_2.1 | 0:2.2.15-15.el6_2.1 |
mod_sslRed Hat:enterprise_linux:6::workstation |
before 1:2.2.15-15.el6_2.1 | 1:2.2.15-15.el6_2.1 |
httpdRed Hat:enterprise_linux:5::client |
before 0:2.2.3-63.el5_8.1 | 0:2.2.3-63.el5_8.1 |
httpd-debuginfoRed Hat:enterprise_linux:5::client |
before 0:2.2.3-63.el5_8.1 | 0:2.2.3-63.el5_8.1 |
mod_sslRed Hat:enterprise_linux:5::client |
before 1:2.2.3-63.el5_8.1 | 1:2.2.3-63.el5_8.1 |
httpdRed Hat:enterprise_linux:5::client_workstation |
before 0:2.2.3-63.el5_8.1 | 0:2.2.3-63.el5_8.1 |
httpd-debuginfoRed Hat:enterprise_linux:5::client_workstation |
before 0:2.2.3-63.el5_8.1 | 0:2.2.3-63.el5_8.1 |
httpd-develRed Hat:enterprise_linux:5::client_workstation |
before 0:2.2.3-63.el5_8.1 | 0:2.2.3-63.el5_8.1 |
httpd-manualRed Hat:enterprise_linux:5::client_workstation |
before 0:2.2.3-63.el5_8.1 | 0:2.2.3-63.el5_8.1 |
httpdRed Hat:enterprise_linux:5::server |
before 0:2.2.3-63.el5_8.1 | 0:2.2.3-63.el5_8.1 |
httpd-debuginfoRed Hat:enterprise_linux:5::server |
before 0:2.2.3-63.el5_8.1 | 0:2.2.3-63.el5_8.1 |
httpd-develRed Hat:enterprise_linux:5::server |
before 0:2.2.3-63.el5_8.1 | 0:2.2.3-63.el5_8.1 |
httpd-manualRed Hat:enterprise_linux:5::server |
before 0:2.2.3-63.el5_8.1 | 0:2.2.3-63.el5_8.1 |
mod_sslRed Hat:enterprise_linux:5::server |
before 1:2.2.3-63.el5_8.1 | 1:2.2.3-63.el5_8.1 |
httpdRed Hat:jboss_enterprise_web_server:1::el5 |
before 0:2.2.17-15.4.ep5.el5 | 0:2.2.17-15.4.ep5.el5 |
httpd-develRed Hat:jboss_enterprise_web_server:1::el5 |
before 0:2.2.17-15.4.ep5.el5 | 0:2.2.17-15.4.ep5.el5 |
httpd-manualRed Hat:jboss_enterprise_web_server:1::el5 |
before 0:2.2.17-15.4.ep5.el5 | 0:2.2.17-15.4.ep5.el5 |
mod_sslRed Hat:jboss_enterprise_web_server:1::el5 |
before 1:2.2.17-15.4.ep5.el5 | 1:2.2.17-15.4.ep5.el5 |
httpdRed Hat:jboss_enterprise_web_server:1::el6 |
before 0:2.2.17-15.4.ep5.el6 | 0:2.2.17-15.4.ep5.el6 |
httpd-develRed Hat:jboss_enterprise_web_server:1::el6 |
before 0:2.2.17-15.4.ep5.el6 | 0:2.2.17-15.4.ep5.el6 |
httpd-manualRed Hat:jboss_enterprise_web_server:1::el6 |
before 0:2.2.17-15.4.ep5.el6 | 0:2.2.17-15.4.ep5.el6 |
httpd-toolsRed Hat:jboss_enterprise_web_server:1::el6 |
before 0:2.2.17-15.4.ep5.el6 | 0:2.2.17-15.4.ep5.el6 |
mod_sslRed Hat:jboss_enterprise_web_server:1::el6 |
before 1:2.2.17-15.4.ep5.el6 | 1:2.2.17-15.4.ep5.el6 |
apache2openSUSE:Tumbleweed |
before 2.4.23-4.1 | 2.4.23-4.1 |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | Apache < 2.0.64 / < 2.2.21 mod_setenvif - Integer Overflow | 2011-11-02 |
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-03 | aliases | EUVD |
| 2026-11-02 | created | CVE List, Exploit-DB, GitHub Advisories, NVD, OSV |
References
h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041
marc.info?l=bugtraq&m=134987041210674&w=2
bugs.launchpad.net/ubuntu/+source/apache2/+bug/811422
halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/DemoExploit.html
rhn.redhat.com/errata/RHSA-2012-0543.html
bugzilla.redhat.com/show_bug.cgi?id=750935
Show 161 moreShow less
oracle.com/technetwork/topics/security/cpujan2015-1972971.html
secunia.com/advisories/45793
securityfocus.com/bid/50494
securitytracker.com/id?1026267
lists.apple.com/archives/security-announce/2012/Sep/msg00004.html
support.apple.com/kb/HT5501
fujitsu.com/global/support/software/security/products-f/interstage-201303e.html
archives.neohapsis.com/archives/fulldisclosure/2011-11/0023.html
osvdb.org/76744
mandriva.com/security/advisories?name=MDVSA-2013:150
debian.org/security/2012/dsa-2405
exchange.xforce.ibmcloud.com/vulnerabilities/71093
lists.apache.org/thread.html/54a42d4b01968df1117cea77fc53d6beb931c0e05936ad02af93e9ac%40%3Ccvs.httpd.apache.org%3E
nvd.nist.gov/vuln/detail/CVE-2011-3607
github.com/advisories/GHSA-chqj-ghv5-hm5m
docs.bell-sw.com/security/cves/CVE-2011-3607
security-tracker.debian.org/tracker/CVE-2011-3607
access.redhat.com/errata/RHSA-2012:0128
security.access.redhat.com/data/csaf/v2/advisories/2012/rhsa-2012_0128.json
cve.org/CVERecord?id=CVE-2011-3607
community.qualys.com/blogs/securitylabs/2011/11/23/apache-reverse-proxy-bypass-issue
httpd.apache.org/security/vulnerabilities_22.html
contextis.com/research/blog/reverseproxybypass
suse.com/security/cve/CVE-2009-0023