Strix
26.1K

CVE-2009-1955

HIGHCVSS 7.5/10EPSS 52.99%

Last modified

CVE-2009-1955 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 52.99% chance of exploitation in the next 30 days.

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 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.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
52.99%

98.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
ApacheApr-Util< 1.3.7
AppleMac Os X< 10.6.2
SuseLinux Enterprise Server9
DebianDebian Linux4.0
CanonicalUbuntu Linux6.06
CanonicalUbuntu Linux8.04
CanonicalUbuntu Linux8.10
CanonicalUbuntu Linux9.04
FedoraprojectFedora9
FedoraprojectFedora10
FedoraprojectFedora11
OracleHttp ServerAll versions
ApacheHttp Server>= 2.2.0, < 2.2.12

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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.
How severe is CVE-2009-1955?
CVE-2009-1955 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 52.99% probability of exploitation in the next 30 days.
How do I fix CVE-2009-1955?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2009-1955?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST