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    CVE-2009-1956

    Off-by-one error in the apr_brigade_vprintf function in Apache APR-util before 1.3.5 on big-endian platforms allows remote attackers to obtain sensitive information or cause a denial of service (application crash) via crafted input.

    Published:Apr 24, 2009
    Last Modified:Apr 23, 2026
    EPS:Jun 6, 2009
    EPSS Score:0.05415
    CVSS Score:6.4

    Affected Products

    Vendor
    Apache
    Product
    Apr-util
    Vendor
    Apache
    Product
    Http Server
    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Redhat
    Product
    Certificate System
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    http://www.openwall.com/lists/oss-security/2009/06/06/1https://bugzilla.redhat.com/show_bug.cgi?id=504390http://www.openwall.com/lists/oss-security/2009/06/06/1https://bugzilla.redhat.com/show_bug.cgi?id=504390

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2025-49506 (CVSS 7.5) — APR-util versions 1.6.3 (and earlier) function apr_password_validate() was not constant-time with regards to h…
    CVE-2026-34191 (CVSS 9.1) — Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in Apache P…
    CVE-2026-34501 (CVSS 7.5) — Heap-based Buffer Overflow vulnerability in Apache Portable Runtime Utility redis client. This issue affects …
    CVE-2026-34502 (CVSS 7.5) — Heap-based Buffer Overflow vulnerability in Apache Portable Runtime Utility memcached client This issue affec…
    CVE-2011-1928 (CVSS 4.3) — The fnmatch implementation in apr_fnmatch.c in the Apache Portable Runtime (APR) library 1.4.3 and 1.4.4, and …
    CVE-2010-1623 (CVSS 5) — Memory leak in the apr_brigade_split_line function in buckets/apr_brigade.c in the Apache Portable Runtime Uti…
    CVE-2009-2412 (CVSS 10) — Multiple integer overflows in the Apache Portable Runtime (APR) library and the Apache Portable Utility librar…
    CVE-2009-0023 (CVSS 4.3) — The apr_strmatch_precompile function in strmatch/apr_strmatch.c in Apache APR-util before 1.3.5 allows remote …
    CVE-2009-1955 (CVSS 7.5) — The expat XML parser in the apr_xml_* interface in xml/apr_xml.c in Apache APR-util before 1.3.7, as used in t…

    References

    http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html
    http://marc.info/?l=bugtraq&m=129190899612998&w=2
    http://secunia.com/advisories/34724
    http://secunia.com/advisories/35284
    http://secunia.com/advisories/35395
    http://secunia.com/advisories/35487
    http://secunia.com/advisories/35565
    http://secunia.com/advisories/35710
    http://secunia.com/advisories/35797
    http://secunia.com/advisories/35843
    http://secunia.com/advisories/37221
    http://security.gentoo.org/glsa/glsa-200907-03.xml
    http://support.apple.com/kb/HT3937
    http://svn.apache.org/viewvc?view=rev&revision=768417
    http://www-01.ibm.com/support/docview.wss?uid=swg1PK88341
    http://www-01.ibm.com/support/docview.wss?uid=swg1PK91241
    http://www-01.ibm.com/support/docview.wss?uid=swg1PK99478
    http://www-01.ibm.com/support/docview.wss?uid=swg27014463
    http://www.apache.org/dist/apr/CHANGES-APR-UTIL-1.3
    http://www.mail-archive.com/dev%40apr.apache.org/msg21591.html
    http://www.mail-archive.com/dev%40apr.apache.org/msg21592.html
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:131
    http://www.mandriva.com/security/advisories?name=MDVSA-2013:150
    http://www.openwall.com/lists/oss-security/2009/06/06/1
    http://www.oracle.com/technetwork/topics/security/cpuapr2013-1899555.html
    http://www.redhat.com/support/errata/RHSA-2009-1107.html
    http://www.redhat.com/support/errata/RHSA-2009-1108.html
    http://www.securityfocus.com/bid/35251
    http://www.ubuntu.com/usn/usn-786-1
    http://www.ubuntu.com/usn/usn-787-1
    http://www.vupen.com/english/advisories/2009/1907
    http://www.vupen.com/english/advisories/2009/3184
    https://bugzilla.redhat.com/show_bug.cgi?id=504390
    https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r2295080a257bad27ea68ca0af12fc715577f9e84801eae116a33107e%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rad01d817195e6cc871cb1d73b207ca326379a20a6e7f30febaf56d24%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rad2acee3ab838b52c04a0698b1728a9a43467bf365bd481c993c535d%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/reb7c64aeea604bf948467d9d1cab8ff23fa7d002be1964bcc275aae7%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3E
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11567
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12237
    https://www.redhat.com/archives/fedora-package-announce/2009-June/msg01173.html
    https://www.redhat.com/archives/fedora-package-announce/2009-June/msg01201.html
    https://www.redhat.com/archives/fedora-package-announce/2009-June/msg01228.html
    http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html
    http://marc.info/?l=bugtraq&m=129190899612998&w=2
    http://secunia.com/advisories/34724
    http://secunia.com/advisories/35284
    http://secunia.com/advisories/35395
    http://secunia.com/advisories/35487
    http://secunia.com/advisories/35565
    http://secunia.com/advisories/35710
    http://secunia.com/advisories/35797
    http://secunia.com/advisories/35843
    http://secunia.com/advisories/37221
    http://security.gentoo.org/glsa/glsa-200907-03.xml
    http://support.apple.com/kb/HT3937
    http://svn.apache.org/viewvc?view=rev&revision=768417
    http://www-01.ibm.com/support/docview.wss?uid=swg1PK88341
    http://www-01.ibm.com/support/docview.wss?uid=swg1PK91241
    http://www-01.ibm.com/support/docview.wss?uid=swg1PK99478
    http://www-01.ibm.com/support/docview.wss?uid=swg27014463
    http://www.apache.org/dist/apr/CHANGES-APR-UTIL-1.3
    http://www.mail-archive.com/dev%40apr.apache.org/msg21591.html
    http://www.mail-archive.com/dev%40apr.apache.org/msg21592.html
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:131
    http://www.mandriva.com/security/advisories?name=MDVSA-2013:150
    http://www.openwall.com/lists/oss-security/2009/06/06/1
    http://www.oracle.com/technetwork/topics/security/cpuapr2013-1899555.html
    http://www.redhat.com/support/errata/RHSA-2009-1107.html
    http://www.redhat.com/support/errata/RHSA-2009-1108.html
    http://www.securityfocus.com/bid/35251
    http://www.ubuntu.com/usn/usn-786-1
    http://www.ubuntu.com/usn/usn-787-1
    http://www.vupen.com/english/advisories/2009/1907
    http://www.vupen.com/english/advisories/2009/3184
    https://bugzilla.redhat.com/show_bug.cgi?id=504390
    https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r2295080a257bad27ea68ca0af12fc715577f9e84801eae116a33107e%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rad01d817195e6cc871cb1d73b207ca326379a20a6e7f30febaf56d24%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rad2acee3ab838b52c04a0698b1728a9a43467bf365bd481c993c535d%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/reb7c64aeea604bf948467d9d1cab8ff23fa7d002be1964bcc275aae7%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3E
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11567
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12237
    https://www.redhat.com/archives/fedora-package-announce/2009-June/msg01173.html
    https://www.redhat.com/archives/fedora-package-announce/2009-June/msg01201.html
    https://www.redhat.com/archives/fedora-package-announce/2009-June/msg01228.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High