CVE-2017-9233

· HIGHModified

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CVSS v3.1

7.5

EPSS

9.05%

Published

Jul 25, 2017

Modified

May 12, 2026

Public PoC / Exploit (1)

All weaponized →

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Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.

Description

XML External Entity vulnerability in libexpat 2.2.0 and earlier (Expat XML Parser Library) allows attackers to put the parser in an infinite loop using a malformed external entity definition from an external DTD.

CVSS Vector

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

Weaknesses (CWE)

CWE-611CWE-835

Affected Products (9)

libexpat_project · libexpatvulnerable

python · python (up to 2.7.15)vulnerable

python · python (up to 3.3.7)vulnerable

python · python (up to 3.4.7)vulnerable

python · python (up to 3.5.4)vulnerable

python · python (up to 3.6.2)vulnerable

debian · debian_linuxvulnerable

References (20)

http://www.debian.org/security/2017/dsa-3898

Third Party Advisory

http://www.openwall.com/lists/oss-security/2017/06/17/7

Mailing ListVDB Entry

http://www.securityfocus.com/bid/99276

Third Party AdvisoryVDB Entry

http://www.securitytracker.com/id/1039427

Third Party AdvisoryVDB Entry

https://github.com/libexpat/libexpat/blob/master/expat/Changes

Release NotesThird Party Advisory

https://libexpat.github.io/doc/cve-2017-9233/

ExploitTechnical DescriptionVendor Advisory

https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E

https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E

https://support.apple.com/HT208112

Third Party Advisory

https://support.apple.com/HT208113

Third Party Advisory

https://support.apple.com/HT208115

Third Party Advisory

https://support.apple.com/HT208144

Third Party Advisory

https://support.f5.com/csp/article/K03244804

Third Party Advisory

http://www.debian.org/security/2017/dsa-3898

Third Party Advisory

http://www.openwall.com/lists/oss-security/2017/06/17/7

Mailing ListVDB Entry

http://www.securityfocus.com/bid/99276

Third Party AdvisoryVDB Entry

http://www.securitytracker.com/id/1039427

Third Party AdvisoryVDB Entry

https://github.com/libexpat/libexpat/blob/master/expat/Changes

Release NotesThird Party Advisory

https://libexpat.github.io/doc/cve-2017-9233/

ExploitTechnical DescriptionVendor Advisory

https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E

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