LOW
httpd: NULL pointer dereference crash in mod_log_config
Published Jan 28, 2012
2.6
LOWCVSS 2.0
EPSS 30.34%
Description
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.
Affected products
No data.
OR
- 2.2.17
- 2.2.18
- 2.2.19
- 2.2.20
- 2.2.21
No data.
Red Hat JBoss Enterprise Web Server 1 for RHEL 5
httpd-0:2.2.17-15.4.ep5.el5
Fixed · RHSA-2012:0542
Red Hat JBoss Enterprise Web Server 1 for RHEL 6
httpd-0:2.2.17-15.4.ep5.el6
Fixed · RHSA-2012:0542
Red Hat JBoss Web Server 1.0
n/a
Fixed · RHSA-2012:0543
Red Hat Enterprise Linux 4
httpd
Not affected
Red Hat Enterprise Linux 5
httpd
Not affected
Red Hat Enterprise Linux 6
httpd
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat JBoss Enterprise Web Server 1 for RHEL 5 | httpd-0:2.2.17-15.4.ep5.el5 | Fixed | RHSA-2012:0542 |
| Red Hat JBoss Enterprise Web Server 1 for RHEL 6 | httpd-0:2.2.17-15.4.ep5.el6 | Fixed | RHSA-2012:0542 |
| Red Hat JBoss Web Server 1.0 | n/a | Fixed | RHSA-2012:0543 |
| Red Hat Enterprise Linux 4 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 5 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 6 | httpd | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Not vulnerable. This issue did not affect the versions of httpd as shipped with Red Hat Enterprise Linux 4, 5, or 6.
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.
2.6 LOW NVD
AV:N/AC:H/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity High
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
30.34% 0.30337
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.30337
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 (20 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 30.34% (0.30337) | 98.18th | v5 (v2026.06.15) |
| Jun 15, 2026 | 30.59% (0.30587) | 98.00th | v5 (v2026.06.15) |
| Dec 28, 2025 | 32.96% (0.32960) | 96.73th | v4 (v2025.03.14) |
| Dec 27, 2025 | 26.19% (0.26185) | 96.15th | v4 (v2025.03.14) |
| Oct 28, 2025 | 32.96% (0.32960) | 96.67th | v4 (v2025.03.14) |
| Oct 27, 2025 | 26.19% (0.26185) | 96.07th | v4 (v2025.03.14) |
| Oct 1, 2025 | 32.96% (0.32960) | 96.77th | v4 (v2025.03.14) |
| Jul 30, 2025 | 26.19% (0.26185) | 96.07th | v4 (v2025.03.14) |
| Apr 11, 2025 | 32.96% (0.32960) | 96.54th | v4 (v2025.03.14) |
| Mar 30, 2025 | 36.40% (0.36400) | 96.79th | v4 (v2025.03.14) |
| Mar 29, 2025 | 40.99% (0.40993) | 96.08th | v4 (v2025.03.14) |
| Mar 17, 2025 | 36.40% (0.36400) | 96.76th | v4 (v2025.03.14) |
| Dec 12, 2024 | 92.39% (0.92388) | 99.10th | v3 (v2023.03.01) |
| Feb 16, 2024 | 92.39% (0.92388) | 98.90th | v3 (v2023.03.01) |
| Oct 26, 2023 | 93.03% (0.93031) | 98.75th | v3 (v2023.03.01) |
| Jun 24, 2023 | 93.48% (0.93476) | 98.67th | v3 (v2023.03.01) |
| Mar 7, 2023 | 94.99% (0.94992) | 98.81th | v3 (v2023.03.01) |
| Mar 6, 2023 | 7.34% (0.07344) | 92.59th | v2 (v2022.01.01) |
| Apr 1, 2022 | 7.34% (0.07344) | 91.87th | v2 (v2022.01.01) |
| Feb 4, 2022 | 7.34% (0.07344) | 80.64th | v2 (v2022.01.01) |
References (31)
- http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041 vendor-advisoryx_refsource_HP
- http://httpd.apache.org/security/vulnerabilities_22.html x_refsource_CONFIRMVendor Advisory
- http://lists.apple.com/archives/security-announce/2012/Sep/msg00004.html vendor-advisoryx_refsource_APPLE
- http://marc.info/?l=bugtraq&m=133294460209056&w=2 vendor-advisoryx_refsource_HP
- http://marc.info/?l=bugtraq&m=133494237717847&w=2 vendor-advisoryx_refsource_HP
- http://rhn.redhat.com/errata/RHSA-2012-0542.html vendor-advisoryx_refsource_REDHAT
- http://rhn.redhat.com/errata/RHSA-2012-0543.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://svn.apache.org/viewvc?view=revision&revision=1227292 x_refsource_CONFIRMPatch
- http://www.mandriva.com/security/advisories?name=MDVSA-2012:012 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/cpujul2012-392727.html x_refsource_CONFIRM
- https://access.redhat.com/security/cve/CVE-2012-0021 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=785065 x_refsource_CONFIRMIssue Tracking
- https://issues.apache.org/bugzilla/show_bug.cgi?id=52256 x_refsource_CONFIRMPatch
- 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/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-2012-0021
- https://www.cve.org/CVERecord?id=CVE-2012-0021
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner redhat
Published Jan 28, 2012
Updated Aug 6, 2024
Reserved Dec 7, 2011
Link CVE-2012-0021
CISA Vulnrichment
Updated n/a