Servers and applications
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.
- Severity
- High 7.5
- Published
- 8 Jun 2009
- Last changed
- 16 Jun 2026
- Added to UpHeron
- 17 Oct 2026
- Fixed in
- 2.2.12
- Exploit chance
- 53% in the next 30 daysHigher than 98% of CVEs. EPSS by FIRST, 12 Nov 2026
- Weakness
- XML entity expansion (CWE-776)
- Attack
- Over the network · No login needed · No user action needed
- Attacker can
- Take it down
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Sources
- NVD
Affected software
| Software | Affected versions |
|---|---|
Apache HTTP ServerServers and applications · cpe:a:apache:http_server |
|