CVE-2009-3720

medium Apache
CVSS v3 Base Score
5.0
AV:N/AC:L/Au:N/C:N/I:N/A:P
EPSS Score
1.2%
Exploitation probability in 30 days
Top 21% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Confidentiality
None
Integrity
None
Availability
P
Published: November 3, 2009 (6036 days ago)
Last Modified: April 23, 2026
Vendor: Apache
Source: NVD

Description

The updatePosition function in lib/xmltok_impl.c in libexpat in Expat 2.0.1, as used in Python, PyXML, w3c-libwww, and other software, allows context-dependent attackers to cause a denial of service (application crash) via an XML document with crafted UTF-8 sequences that trigger a buffer over-read, a different vulnerability than CVE-2009-2625.

CWE

NVD-CWE-noinfo

Affected Products

libexpat project libexpatapache http server

References

🔗 expat.cvs.sourceforge.net 🔗 expat.cvs.sourceforge.net 🔗 lists.fedoraproject.org 🔗 lists.fedoraproject.org 🔗 lists.fedoraproject.org