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CVE-2009-3720

N/A
Published: November 3, 2009 at 04:00 PM UTC
Updated: July 20, 2026 at 05:48 PM UTC
2 products affected across 2 vendorsHTTP ServerLibexpat· also runs on 2 platforms

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Severity
N/A
Exploit prediction
EPSS 28%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

HTTP Server· Apache
95%
2.0.35 ≤ v < 2.0.642.2.0 ≤ v < 2.2.17
Affected range stops below 2.0.64, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.2.17, so it looks safe — our inference, not a vendor statement
Libexpat· Libexpat Project
95%
2.0.1
python-python (environment) · python-pyxml (environment)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

References (93)

x_refsource_CONFIRMExploit
Source: [email protected]
http://expat.cvs.sourceforge.net/viewvc/expat/expat/lib/xmltok_impl.c?r1=1.13&r2=1.15&view=patch
x_refsource_CONFIRMMailing ListThird Party Advisory
Source: [email protected]
http://expat.cvs.sourceforge.net/viewvc/expat/expat/lib/xmltok_impl.c?view=log
Vendor Advisoryx_refsource_FEDORAThird Party Advisory
Source: [email protected]
http://lists.fedoraproject.org/pipermail/package-announce/2010-November/051228.html
Vendor Advisoryx_refsource_FEDORAMailing ListThird Party Advisory
Source: [email protected]
http://lists.fedoraproject.org/pipermail/package-announce/2010-November/051247.html
Vendor Advisoryx_refsource_FEDORAThird Party Advisory
Source: [email protected]
http://lists.fedoraproject.org/pipermail/package-announce/2010-November/051367.html
Vendor Advisoryx_refsource_FEDORAThird Party Advisory
Source: [email protected]
http://lists.fedoraproject.org/pipermail/package-announce/2010-November/051405.html
Vendor Advisoryx_refsource_FEDORAThird Party Advisory
Source: [email protected]
http://lists.fedoraproject.org/pipermail/package-announce/2010-November/051442.html
Vendor Advisoryx_refsource_SUSEThird Party Advisory
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2009-11/msg00004.html

CVSS

5MEDIUM[email protected]
Confidentiality
NONE
Integrity
NONE
Availability
PARTIAL
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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