CVE-2017-9233

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.

• CWE-611
• CWE-835

• http://www.debian.org/security/2017/dsa-3898Third Party Advisory
• http://www.openwall.com/lists/oss-security/2017/06/17/7Mailing List, VDB Entry
• http://www.securityfocus.com/bid/99276Third Party Advisory, VDB Entry
• http://www.securitytracker.com/id/1039427Third Party Advisory, VDB Entry
• https://github.com/libexpat/libexpat/blob/master/expat/ChangesRelease Notes, Third Party Advisory
• https://libexpat.github.io/doc/cve-2017-9233/Exploit, Technical Description, Vendor 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/HT208112Third Party Advisory
• https://support.apple.com/HT208113Third Party Advisory
• https://support.apple.com/HT208115Third Party Advisory
• https://support.apple.com/HT208144Third Party Advisory
• https://support.f5.com/csp/article/K03244804Third Party Advisory
• http://www.debian.org/security/2017/dsa-3898Third Party Advisory
• http://www.openwall.com/lists/oss-security/2017/06/17/7Mailing List, VDB Entry
• http://www.securityfocus.com/bid/99276Third Party Advisory, VDB Entry
• http://www.securitytracker.com/id/1039427Third Party Advisory, VDB Entry
• https://github.com/libexpat/libexpat/blob/master/expat/ChangesRelease Notes, Third Party Advisory
• https://libexpat.github.io/doc/cve-2017-9233/Exploit, Technical Description, Vendor 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/HT208112Third Party Advisory
• https://support.apple.com/HT208113Third Party Advisory
• https://support.apple.com/HT208115Third Party Advisory
• https://support.apple.com/HT208144Third Party Advisory
• https://support.f5.com/csp/article/K03244804Third Party Advisory

Published

Jul 25, 2017

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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