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    CVE-2009-1955

    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 the mod_dav and mod_dav_svn modules in the Apache HTTP Server, allows remote attackers to cause a denial of service (memory consumption) via a crafted XML document containing a large number of nested entity references, as demonstrated by a PROPFIND request, a similar issue to CVE-2003-1564.

    Published:Jun 1, 2009
    Last Modified:Apr 23, 2026
    EPS:Jun 6, 2009
    EPSS Score:0.02329
    CVSS Score:7.5

    Affected Products

    Vendor
    Apache
    Product
    Apr-util
    Vendor
    Apache
    Product
    Http Server
    Vendor
    Apple
    Product
    Mac Os X
    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Oracle
    Product
    Http Server
    Vendor
    Redhat
    Product
    Certificate System
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Jboss Enterprise Web Server
    Vendor
    Suse
    Product
    Linux Enterprise Server

    Exploits

    https://www.exploit-db.com/exploits/8842https://www.exploit-db.com/exploits/8842https://www.exploit-db.com/exploits/8842

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-197 Exponential Data Expansion

    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-2009-1956 (CVSS 6.4) — Off-by-one error in the apr_brigade_vprintf function in Apache APR-util before 1.3.5 on big-endian platforms a…

    References

    http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html
    http://lists.opensuse.org/opensuse-security-announce/2010-05/msg00001.html
    http://marc.info/?l=apr-dev&m=124396021826125&w=2
    http://marc.info/?l=bugtraq&m=129190899612998&w=2
    http://secunia.com/advisories/34724
    http://secunia.com/advisories/35284
    http://secunia.com/advisories/35360
    http://secunia.com/advisories/35395
    http://secunia.com/advisories/35444
    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/36473
    http://secunia.com/advisories/37221
    http://security.gentoo.org/glsa/glsa-200907-03.xml
    http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.538210
    http://support.apple.com/kb/HT3937
    http://svn.apache.org/viewvc?view=rev&revision=781403
    http://wiki.rpath.com/Advisories:rPSA-2009-0123
    http://www-01.ibm.com/support/docview.wss?uid=swg1PK88342
    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.debian.org/security/2009/dsa-1812
    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/2009/06/03/4
    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/archive/1/506053/100/0/threaded
    http://www.securityfocus.com/bid/35253
    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
    http://www.vupen.com/english/advisories/2010/1107
    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/r476d175be0aaf4a17680ef98c5153b4d336eaef76fb2224cc94c463a%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/rc4c53a0d57b2771ecd4b965010580db355e38137c8711311ee1073a8%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%3A10270
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12473
    https://www.exploit-db.com/exploits/8842
    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://lists.opensuse.org/opensuse-security-announce/2010-05/msg00001.html
    http://marc.info/?l=apr-dev&m=124396021826125&w=2
    http://marc.info/?l=bugtraq&m=129190899612998&w=2
    http://secunia.com/advisories/34724
    http://secunia.com/advisories/35284
    http://secunia.com/advisories/35360
    http://secunia.com/advisories/35395
    http://secunia.com/advisories/35444
    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/36473
    http://secunia.com/advisories/37221
    http://security.gentoo.org/glsa/glsa-200907-03.xml
    http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.538210
    http://support.apple.com/kb/HT3937
    http://svn.apache.org/viewvc?view=rev&revision=781403
    http://wiki.rpath.com/Advisories:rPSA-2009-0123
    http://www-01.ibm.com/support/docview.wss?uid=swg1PK88342
    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.debian.org/security/2009/dsa-1812
    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/2009/06/03/4
    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/archive/1/506053/100/0/threaded
    http://www.securityfocus.com/bid/35253
    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
    http://www.vupen.com/english/advisories/2010/1107
    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/r476d175be0aaf4a17680ef98c5153b4d336eaef76fb2224cc94c463a%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/rc4c53a0d57b2771ecd4b965010580db355e38137c8711311ee1073a8%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%3A10270
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12473
    https://www.exploit-db.com/exploits/8842
    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