01 Record

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

UnratedPUBLISHEDCNA: mitre

CNA base scoreUnratedNo CNA CVSS vector

View raw JSON

02 Description

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

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 52.98% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 98.8% of scored records. A rank, not a probability.
NVD base score: 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD analysis status: Modified. NVD last modified this record on 2026-06-16.
Red Hat severity: Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2009-06-06 18:00Z17 YR AGO

Last updated

2024-08-07 05:36Z2 YR AGO

Reserved

2009-06-06

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

CWE-776Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')Base

Data version

5.1

Document digest

6317bb15dc9e32cbc4e0fd1b6c55cd0d9e3cdcfb0767e862b94d8c76850e97cb

05 Affected products

VendorProductVersionsPlatforms

apacheapr-utilNot specified—

apachehttp_serverNot specified—

applemac_os_xNot specified—

canonicalubuntu_linuxNot specified—

debiandebian_linuxNot specified—

fedoraprojectfedoraNot specified—

oraclehttp_serverNot specified—

redhatcertificate_systemNot specified—

redhatenterprise_linuxNot specified—

redhatjboss_enterprise_web_serverNot specified—

suselinux_enterprise_serverNot specified—

06 References

secunia.com35487http://secunia.com/advisories/35487third-party-advisoryx_refsource_SECUNIA
www.debian.orgDSA-1812http://www.debian.org/security/2009/dsa-1812vendor-advisoryx_refsource_DEBIAN
www.apache.orghttp://www.apache.org/dist/apr/CHANGES-APR-UTIL-1.3x_refsource_CONFIRM
www.vupen.comADV-2009-1907http://www.vupen.com/english/advisories/2009/1907vdb-entryx_refsource_VUPEN
www.redhat.comFEDORA-2009-5969https://www.redhat.com/archives/fedora-package-announce/2009-June/msg01228.htmlvendor-advisoryx_refsource_FEDORA
secunia.com35444http://secunia.com/advisories/35444third-party-advisoryx_refsource_SECUNIA
marc.info[apr-dev] 20090602 [PATCH] prevent "billion laughs" attack against expathttp://marc.info/?l=apr-dev&m=124396021826125&w=2mailing-listx_refsource_MLIST
www.mandriva.comMDVSA-2009:131http://www.mandriva.com/security/advisories?name=MDVSA-2009:131vendor-advisoryx_refsource_MANDRIVA
oval.cisecurity.orgoval:org.mitre.oval:def:10270https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10270vdb-entrysignaturex_refsource_OVAL
secunia.com35360http://secunia.com/advisories/35360third-party-advisoryx_refsource_SECUNIA
www.vupen.comADV-2010-1107http://www.vupen.com/english/advisories/2010/1107vdb-entryx_refsource_VUPEN
www.openwall.com[oss-security] 20090603 CVE request: "billion laughs" attack against Apache APRhttp://www.openwall.com/lists/oss-security/2009/06/03/4mailing-listx_refsource_MLIST
secunia.com35395http://secunia.com/advisories/35395third-party-advisoryx_refsource_SECUNIA
www-01.ibm.comPK99478http://www-01.ibm.com/support/docview.wss?uid=swg1PK99478vendor-advisoryx_refsource_AIXAPAR
www.securityfocus.com20090824 rPSA-2009-0123-1 apr-utilhttp://www.securityfocus.com/archive/1/506053/100/0/threadedmailing-listx_refsource_BUGTRAQ
lists.opensuse.orgSUSE-SR:2010:011http://lists.opensuse.org/opensuse-security-announce/2010-05/msg00001.htmlvendor-advisoryx_refsource_SUSE
secunia.com35284http://secunia.com/advisories/35284third-party-advisoryx_refsource_SECUNIA
www-01.ibm.comPK91241http://www-01.ibm.com/support/docview.wss?uid=swg1PK91241vendor-advisoryx_refsource_AIXAPAR
secunia.com36473http://secunia.com/advisories/36473third-party-advisoryx_refsource_SECUNIA
www-01.ibm.comPK88342http://www-01.ibm.com/support/docview.wss?uid=swg1PK88342vendor-advisoryx_refsource_AIXAPAR
secunia.com35843http://secunia.com/advisories/35843third-party-advisoryx_refsource_SECUNIA
www.redhat.comFEDORA-2009-6014https://www.redhat.com/archives/fedora-package-announce/2009-June/msg01173.htmlvendor-advisoryx_refsource_FEDORA
www.redhat.comRHSA-2009:1108http://www.redhat.com/support/errata/RHSA-2009-1108.htmlvendor-advisoryx_refsource_REDHAT
marc.infoHPSBUX02612http://marc.info/?l=bugtraq&m=129190899612998&w=2vendor-advisoryx_refsource_HP
oval.cisecurity.orgoval:org.mitre.oval:def:12473https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12473vdb-entrysignaturex_refsource_OVAL
secunia.com35797http://secunia.com/advisories/35797third-party-advisoryx_refsource_SECUNIA
www.oracle.comhttp://www.oracle.com/technetwork/topics/security/cpuapr2013-1899555.htmlx_refsource_CONFIRM
security.gentoo.orgGLSA-200907-03http://security.gentoo.org/glsa/glsa-200907-03.xmlvendor-advisoryx_refsource_GENTOO
svn.apache.orghttp://svn.apache.org/viewvc?view=rev&revision=781403x_refsource_CONFIRM
www.redhat.comFEDORA-2009-6261https://www.redhat.com/archives/fedora-package-announce/2009-June/msg01201.htmlvendor-advisoryx_refsource_FEDORA
www.ubuntu.comUSN-786-1http://www.ubuntu.com/usn/usn-786-1vendor-advisoryx_refsource_UBUNTU
secunia.com34724http://secunia.com/advisories/34724third-party-advisoryx_refsource_SECUNIA
secunia.com37221http://secunia.com/advisories/37221third-party-advisoryx_refsource_SECUNIA
secunia.com35565http://secunia.com/advisories/35565third-party-advisoryx_refsource_SECUNIA
www.vupen.comADV-2009-3184http://www.vupen.com/english/advisories/2009/3184vdb-entryx_refsource_VUPEN
wiki.rpath.comhttp://wiki.rpath.com/Advisories:rPSA-2009-0123x_refsource_CONFIRM
www.exploit-db.com8842https://www.exploit-db.com/exploits/8842exploitx_refsource_EXPLOIT-DB
slackware.comSSA:2009-167-02http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.538210vendor-advisoryx_refsource_SLACKWARE
www-01.ibm.comhttp://www-01.ibm.com/support/docview.wss?uid=swg27014463x_refsource_CONFIRM
lists.apple.comAPPLE-SA-2009-11-09-1http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.htmlvendor-advisoryx_refsource_APPLE
www.mandriva.comMDVSA-2013:150http://www.mandriva.com/security/advisories?name=MDVSA-2013:150vendor-advisoryx_refsource_MANDRIVA
secunia.com35710http://secunia.com/advisories/35710third-party-advisoryx_refsource_SECUNIA
www.securityfocus.com35253http://www.securityfocus.com/bid/35253vdb-entryx_refsource_BID
www.redhat.comRHSA-2009:1107http://www.redhat.com/support/errata/RHSA-2009-1107.htmlvendor-advisoryx_refsource_REDHAT
support.apple.comhttp://support.apple.com/kb/HT3937x_refsource_CONFIRM
www.ubuntu.comUSN-787-1http://www.ubuntu.com/usn/usn-787-1vendor-advisoryx_refsource_UBUNTU
lists.apache.org[httpd-cvs] 20190815 svn commit: r1048743 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.htmlhttps://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3Emailing-listx_refsource_MLIST
lists.apache.org[httpd-cvs] 20190815 svn commit: r1048742 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.htmlhttps://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3Emailing-listx_refsource_MLIST
lists.apache.org[httpd-cvs] 20200401 svn commit: r1058586 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.htmlhttps://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3Emailing-listx_refsource_MLIST
lists.apache.org[httpd-cvs] 20200401 svn commit: r1058587 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.htmlhttps://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3Emailing-listx_refsource_MLIST
lists.apache.org[httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3Emailing-listx_refsource_MLIST
lists.apache.org[httpd-cvs] 20210330 svn commit: r1888194 [6/13] - /httpd/site/trunk/content/security/json/https://lists.apache.org/thread.html/reb7c64aeea604bf948467d9d1cab8ff23fa7d002be1964bcc275aae7%40%3Ccvs.httpd.apache.org%3Emailing-listx_refsource_MLIST
lists.apache.org[httpd-cvs] 20210330 svn commit: r1073140 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.htmlhttps://lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3Emailing-listx_refsource_MLIST
lists.apache.org[httpd-cvs] 20210330 svn commit: r1073139 [6/13] - in /websites/staging/httpd/trunk/content: ./ security/json/https://lists.apache.org/thread.html/r2295080a257bad27ea68ca0af12fc715577f9e84801eae116a33107e%40%3Ccvs.httpd.apache.org%3Emailing-listx_refsource_MLIST
lists.apache.org[httpd-cvs] 20210330 svn commit: r1073146 [2/3] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities-httpd.xml security/vulnerabilities_22.html security/vulnerabilities_24.htmlhttps://lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org%3Emailing-listx_refsource_MLIST
lists.apache.org[httpd-cvs] 20210330 svn commit: r1073149 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3Emailing-listx_refsource_MLIST
lists.apache.org[httpd-cvs] 20210330 svn commit: r1073149 [6/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/https://lists.apache.org/thread.html/rc4c53a0d57b2771ecd4b965010580db355e38137c8711311ee1073a8%40%3Ccvs.httpd.apache.org%3Emailing-listx_refsource_MLIST
lists.apache.org[httpd-cvs] 20210603 svn commit: r1075360 [2/3] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.htmlhttps://lists.apache.org/thread.html/rad01d817195e6cc871cb1d73b207ca326379a20a6e7f30febaf56d24%40%3Ccvs.httpd.apache.org%3Emailing-listx_refsource_MLIST
lists.apache.org[httpd-cvs] 20210606 svn commit: r1075467 [2/2] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.htmlhttps://lists.apache.org/thread.html/r476d175be0aaf4a17680ef98c5153b4d336eaef76fb2224cc94c463a%40%3Ccvs.httpd.apache.org%3Emailing-listx_refsource_MLIST
lists.apache.org[httpd-cvs] 20210606 svn commit: r1075470 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2020-13938.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.htmlhttps://lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3Emailing-listx_refsource_MLIST

07 Fixed in

Debian 12

apr-util
Fixed in 1.3.7+dfsg-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

apr-util
Fixed in 1.3.7+dfsg-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

apr-util
Fixed in 1.3.7+dfsg-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.