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Vulnerability record · CVE-2017-9233 · published 25 July 2017

CVE-2017-9233: Libexpat project libexpat xml external entity (xxe) vulnerability

LLibexpat Project · Libexpat

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.

7.5 CVSS 3.1 High EPSS 8.7% · top 5.0% CWE-611 · XML external entity (XXE)CWE-835 · CWE-835
7.5CVSS 3.1 base score, v2 5.0
8.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
26References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2017-9233), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.