CVE-2011-2767

mod_perl 2.0 through 2.0.10 allows attackers to execute arbitrary Perl code by placing it in a user-owned .htaccess file, because (contrary to the documentation) there is no configuration option that permits Perl code for the administrator's control of HTTP request processing without also permitting unprivileged users to run Perl code in the context of the user account that runs Apache HTTP Server processes.

Published: 2018-08-26 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-2767 is rated High Risk (77.3/100): CVSS Critical severity, with high exploitation likelihood (EPSS 8.95%, 95th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +5.49% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2011-2767

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 3.45% 8.95% +5.49%
2 2026-03-12 3.63% 3.45% -0.18%
3 2026-02-05 — 3.63% —

Full EPSS history (26 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-2767

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
10.0 2.0 HIGH
AV:N/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 10.0 [email protected]

Weakness enumeration for CVE-2011-2767

OS Trackers for CVE-2011-2767

vendor priority summary link
debian not yet assigned CVE-2011-2767 not yet assigned priority: Debian including 1 source packages (libapache2-mod-perl2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2011-2767
redhat high — https://access.redhat.com/security/cve/CVE-2011-2767
suse medium CVE-2011-2767 severity moderate: SUSE including 13 source package names (apache2-mod_perl-2.0.11-2.12, apache2-mod_perl-2.0.11-bp150.3.3.1, …), 21 product×package rows across 16 product lines (SUSE Linux Enterprise Point of Sale 11 SP3, SUSE Linux Enterprise Server 11 SP1-TERADATA, … (16 product lines)): Fixed 21. https://www.suse.com/security/cve/CVE-2011-2767/
ubuntu medium CVE-2011-2767 medium priority: Ubuntu including 1 source packages (libapache2-mod-perl2), 5 status rows across 5 suites (bionic, cosmic, trusty, upstream, xenial): released 4, needs-triage 1. https://ubuntu.com/security/CVE-2011-2767

Affected software / configurations for CVE-2011-2767

Vendor Product Version Raw CPE
apache mod_perl >= 2.0.0, <= 2.0.10 cpe:2.3:a:apache:mod_perl:*:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
redhat enterprise_linux 6.0 cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
redhat enterprise_linux 6.7 cpe:2.3:o:redhat:enterprise_linux:6.7:*:*:*:*:*:*:*
redhat enterprise_linux 7.0 cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
redhat enterprise_linux 7.3 cpe:2.3:o:redhat:enterprise_linux:7.3:*:*:*:*:*:*:*
redhat enterprise_linux 7.4 cpe:2.3:o:redhat:enterprise_linux:7.4:*:*:*:*:*:*:*
redhat enterprise_linux 7.5 cpe:2.3:o:redhat:enterprise_linux:7.5:*:*:*:*:*:*:*
redhat enterprise_linux 7.6 cpe:2.3:o:redhat:enterprise_linux:7.6:*:*:*:*:*:*:*
redhat enterprise_linux_desktop 6.0 cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_server 6.0 cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_workstation 6.0 cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*
canonical ubuntu_linux 12.04 cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
canonical ubuntu_linux 14.04 cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 18.04 cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 18.10 cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*

References for CVE-2011-2767

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00063.html
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00065.html
http://www.securityfocus.com/bid/105195 Third Party Advisory VDB Entry
https://access.redhat.com/errata/RHSA-2018:2737 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2825 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2826 Third Party Advisory
https://bugs.debian.org/644169 Issue Tracking Mailing List Third Party Advisory
https://lists.apache.org/thread.html/c8ebe8aad147a3ad2e7b0e8b2da45263171ab5d0fc7f8c100feaa94d%40%3Cmodperl-cvs.perl.apache.org%3E
https://lists.debian.org/debian-lts-announce/2018/09/msg00018.html Mailing List Third Party Advisory
https://mail-archives.apache.org/mod_mbox/perl-modperl/201110.mbox/raw/%3C20111004084343.GA21290%40ktnx.net%3E Mailing List Third Party Advisory
https://usn.ubuntu.com/3825-1/ Third Party Advisory
https://usn.ubuntu.com/3825-2/ Third Party Advisory
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