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Fencer Intel
low 2.6

CVE-2012-0021 json

The log_cookie function in mod_log_config.c in the mod_log_config module in the Apache HTTP Server 2.2.17 through 2.2.21, when a threaded M…

published 2012-01-28 14 y ago modified 2026-06-16 4 mo ago also EUVD-2012-0062

cvss
2.6
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
30.3%
EPSS 30.3% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

The log_cookie function in mod_log_config.c in the mod_log_config module in the Apache HTTP Server 2.2.17 through 2.2.21, when a threaded MPM is used, does not properly handle a %{}C format string, which allows remote attackers to cause a denial of service (daemon crash) via a cookie that lacks both a name and a value.

Patch / fix

  • apache2 Debian 14, Debian 13, Debian 12 2.2.22-1

debian advisories DEBIAN-CVE-2012-0021

  • httpd jboss enterprise web server 1 2.2.17-15.4.ep5.el5
  • httpd jboss enterprise web server 1 2.2.17-15.4.ep5.el6
  • mod_ssl jboss enterprise web server 1 1:2.2.17-15.4.ep5.el5
  • mod_ssl jboss enterprise web server 1 1:2.2.17-15.4.ep5.el6
  • httpd-tools jboss enterprise web server 1 2.2.17-15.4.ep5.el6
  • httpd-manual jboss enterprise web server 1 2.2.17-15.4.ep5.el5
  • httpd-manual jboss enterprise web server 1 2.2.17-15.4.ep5.el6

red hat advisories RHSA-2012:0542

  • apache2 Studio Onsite 1.3, SLES for SAP 11 SP4, SLES 11 SP4 +4 more 2.2.34-70.12.1

suse advisories SUSE-SU-2017:2907-1

  • apache2 openSUSE Tumbleweed 2.4.23-4.1

opensuse advisories openSUSE-SU-2024:10268-1

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-2012-0021 updated cvss 4.3

httpd: NULL pointer dereference crash in mod_log_config

  • Red Hat JBoss Enterprise Web Server 1 for RHEL 5 Server httpd 2.2.17-15.4.ep5.el5, mod_ssl 2.2.17-15.4.ep5.el5, httpd-manual 2.2.17-15.4.ep5.el5 Red Hat JBoss Enterprise Web Server 1 for RHEL 6 Server httpd 2.2.17-15.4.ep5.el6, mod_ssl 2.2.17-15.4.ep5.el6, httpd-tools 2.2.17-15.4.ep5.el6, httpd-manual 2.2.17-15.4.ep5.el6
    fixed: vendor fix RHSA-2012:0542
  • Red Hat JBoss Web Server 1.0
    fixed: vendor fix RHSA-2012:0543
  • Red Hat Enterprise Linux 4 httpd Red Hat Enterprise Linux 5 httpd Red Hat Enterprise Linux 6 httpd, mod_ssl, httpd-tools, httpd-manual
    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

30.34% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 2.6 AV:N/AC:H/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation
Technology feeds

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.