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Fencer Intel
critical 9.8

CVE-2011-2767 json

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…

published 2018-08-26 8 y ago modified 2026-06-16 4 mo ago also EUVD-2011-2741

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
8.8%
EPSS 8.8% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

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.

Patch / fix

  • libapache2-mod-perl2 Debian 14, Debian 13, Debian 12 2.0.10-3

debian advisories DEBIAN-CVE-2011-2767

  • libapache2-mod-perl2 Ubuntu 14.04 LTS 2.0.8+httpd24-r1449661-6ubuntu2.1
  • libapache2-mod-perl2 Ubuntu 16.04 LTS 2.0.9-4ubuntu1.2
  • libapache2-mod-perl2 Ubuntu 18.04 LTS 2.0.10-2ubuntu3.18.04.1

ubuntu advisories UBUNTU-CVE-2011-2767

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • rh-perl524-mod_perl RHEL 3 SOFTWARE_COLLECTIONS 2.0.9-10.el6
  • rh-perl524-mod_perl RHEL 3 SOFTWARE_COLLECTIONS 2.0.9-10.el7
  • rh-perl526-mod_perl RHEL 3 SOFTWARE_COLLECTIONS 2.0.10-10.el7
  • mod_perl RHEL 6 2.0.4-12.el6_10

red hat advisories RHSA-2018:2826RHSA-2018:2825RHSA-2018:2737

  • apache2-mod_perl SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 2.0.4-40.63.3.3
  • apache2-mod_perl SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +3 more 2.0.8-13.5.1

suse advisories SUSE-SU-2020:14266-1SUSE-SU-2019:3213-1

  • apache2-mod_perl openSUSE Tumbleweed 2.0.11-2.12
  • apache2-mod_perl Package Hub 15 SP1, Package Hub 15 2.0.11-bp151.4.3.1
  • apache2-mod_perl openSUSE Leap 15.1, openSUSE Leap 15.0 2.0.11-lp151.3.3.1

opensuse advisories openSUSE-SU-2024:10626-1openSUSE-SU-2019:2558-1openSUSE-SU-2019:2549-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2011-2767 updated cvss 6.3

mod_perl: arbitrary Perl code execution in the context of the user account via a user-owned .htaccess

  • Red Hat Enterprise Linux 5 mod_perl
    affected: workaround, no fix planned “Disabling the UserDir directive and also setting AllowOverride None should prevent the processing of perl in user .htaccess files.”
  • Red Hat Enterprise Linux Desktop (v. 6) mod_perl 2.0.4-12.el6_10 Red Hat Enterprise Linux Desktop Optional (v. 6) mod_perl-devel 2.0.4-12.el6_10, mod_perl-debuginfo 2.0.4-12.el6_10 Red Hat Enterprise Linux HPC Node (v. 6) mod_perl 2.0.4-12.el6_10 Red Hat Enterprise Linux HPC Node Optional (v. 6) mod_perl-devel 2.0.4-12.el6_10, mod_perl-debuginfo 2.0.4-12.el6_10 Red Hat Enterprise Linux Server (v. 6) mod_perl 2.0.4-12.el6_10 Red Hat Enterprise Linux Server Optional (v. 6) mod_perl-devel 2.0.4-12.el6_10, mod_perl-debuginfo 2.0.4-12.el6_10
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 6) mod_perl 2.0.4-12.el6_10 Red Hat Enterprise Linux Workstation Optional (v. 6) mod_perl-devel 2.0.4-12.el6_10, mod_perl-debuginfo 2.0.4-12.el6_10
    fixed: vendor fix “Disabling the UserDir directive and also setting AllowOverride None should prevent the processing of perl in user .htaccess files.” RHSA-2018:2737
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) rh-perl524-mod_perl 2.0.9-10.el6 Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-perl524-mod_perl 2.0.9-10.el7, rh-perl526-mod_perl 2.0.10-10.el7 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.7) rh-perl524-mod_perl 2.0.9-10.el6 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.3) rh-perl524-mod_perl 2.0.9-10.el7, rh-perl526-mod_perl 2.0.10-10.el7 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4) rh-perl524-mod_perl 2.0.9-10.el7, rh-perl526-mod_perl 2.0.10-10.el7 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5) rh-perl524-mod_perl 2.0.9-10.el7, rh-perl526-mod_perl 2.0.10-10.el7
    +2 more products
    Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) rh-perl524-mod_perl 2.0.9-10.el6 Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-perl524-mod_perl 2.0.9-10.el7, rh-perl526-mod_perl 2.0.10-10.el7
    fixed: vendor fix “Disabling the UserDir directive and also setting AllowOverride None should prevent the processing of perl in user .htaccess files.” RHSA-2018:2826
  • Red Hat Enterprise Linux 8 mod_perl
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

8.83% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • n/a mod_perl 2.0 through 2.0.10

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.