CVE Feed

    Dashboard / CVE / CVE-2017-9233

    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.

    Published:Jun 14, 2017
    Last Modified:Apr 20, 2025
    EPS:Jul 25, 2017
    EPSS Score:0.00158
    CVSS Score:7.5

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Libexpat Project
    Product
    Libexpat
    Vendor
    Python
    Product
    Python

    Exploits

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

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-221 Data Serialization External Entities Blowup

    Related CVEs

    CVE-2026-77118 (CVSS 8.4) — A heap out-of-bounds write exists in the Photo CD (PCD) decoder of GraphicsMagick. In DecodeImage() (coders/pc…
    CVE-2026-56968 (CVSS 3.7) — GNU SASL before 2.2.4 lacks sanitization of a short challenge in _gsasl_ntlm_client_step in the NTLM client, w…
    CVE-2026-49975 (CVSS 7.5) — Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server's mod_http leads to denial of …
    CVE-2026-9256 (CVSS 9.2) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerabilit…
    CVE-2026-31431 (CVSS 7.8) — In the Linux kernel, the following vulnerability has been resolved: crypto: algif_aead - Revert to operating …
    CVE-2026-34757 (CVSS 5.1) — LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network …
    CVE-2026-4775 (CVSS 7.8) — A flaw was found in the libtiff library. A remote attacker could exploit a signed integer overflow vulnerabili…
    CVE-2025-63261 (CVSS 7.8) — AWStats 8.0 is vulnerable to Command Injection via the open function…
    CVE-2026-3497 (CVSS 6.9) — Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions. This vulnerability affects …
    CVE-2026-1940 (CVSS 5.1) — An incomplete fix for CVE-2024-47778 allows an out-of-bounds read in gst_wavparse_adtl_chunk() function. The p…

    References

    http://www.debian.org/security/2017/dsa-3898
    http://www.openwall.com/lists/oss-security/2017/06/17/7
    http://www.securityfocus.com/bid/99276
    http://www.securitytracker.com/id/1039427
    https://github.com/libexpat/libexpat/blob/master/expat/Changes
    https://libexpat.github.io/doc/cve-2017-9233/
    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
    https://support.apple.com/HT208113
    https://support.apple.com/HT208115
    https://support.apple.com/HT208144
    https://support.f5.com/csp/article/K03244804
    http://www.debian.org/security/2017/dsa-3898
    http://www.openwall.com/lists/oss-security/2017/06/17/7
    http://www.securityfocus.com/bid/99276
    http://www.securitytracker.com/id/1039427
    https://github.com/libexpat/libexpat/blob/master/expat/Changes
    https://libexpat.github.io/doc/cve-2017-9233/
    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
    https://support.apple.com/HT208113
    https://support.apple.com/HT208115
    https://support.apple.com/HT208144
    https://support.f5.com/csp/article/K03244804

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High