CVE-2013-0340expat before version 2.4.0 does not properly handle entities expansion unless an application developer uses the XML_SetEntityDeclHandler function, which allows remote attackers to cause a denial of s…
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It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 9 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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expat before version 2.4.0 does not properly handle entities expansion unless an application developer uses the XML_SetEntityDeclHandler function, which allows remote attackers to cause a denial of service (resource consumption), send HTTP requests to intranet servers, or read arbitrary files via a crafted XML document, aka an XML External Entity (XXE) issue. NOTE: it could be argued that because expat already provides the ability to disable external entity expansion, the responsibility for resolving this issue lies with application developers; according to this argument, this entry should be REJECTed, and each affected application would need its own CVE.
- CVSS
- 6.8 MEDIUM (v2.0, NVD)AV:N/AC:M/Au:N/C:P/I:P/A:P
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Modified
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
libexpat_project libexpat libexpat_project:libexpat | before 2.4.0 | NVD |
python python python:python | from 3.6.0 before 3.6.15; from 3.7.0 before 3.7.12; from 3.8.0 before 3.8.12; from 3.9.0 before 3.9.7 | NVD |
apple ipados apple:ipados | before 14.8 | NVD |
apple iphone_os apple:iphone_os | before 14.8 | NVD |
apple macos apple:macos | before 11.6 | NVD |
apple tvos apple:tvos | before 15.0 | NVD |
apple watchos apple:watchos | before 8.0 | NVD |
References
- http://openwall.com/lists/oss-security/2013/02/22/3mailing-list, x-refsource-mlist, exploit, third-party-advisory
- http://www.openwall.com/lists/oss-security/2013/04/12/6mailing-list, x-refsource-mlist, third-party-advisory
- http://www.osvdb.org/90634vdb-entry, x-refsource-osvdb, broken-link
- http://securitytracker.com/id?1028213vdb-entry, x-refsource-sectrack, third-party-advisory
- https://security.gentoo.org/glsa/201701-21vendor-advisory, x-refsource-gentoo, third-party-advisory
- http://www.securityfocus.com/bid/58233vdb-entry, x-refsource-bid, broken-link, third-party-advisory
- https://support.apple.com/kb/HT212805x-refsource-confirm, third-party-advisory
- https://support.apple.com/kb/HT212804x-refsource-confirm, third-party-advisory
- https://support.apple.com/kb/HT212807x-refsource-confirm, third-party-advisory
- https://support.apple.com/kb/HT212819x-refsource-confirm, third-party-advisory
- https://support.apple.com/kb/HT212814x-refsource-confirm, third-party-advisory
- https://support.apple.com/kb/HT212815x-refsource-confirm, third-party-advisory
- http://seclists.org/fulldisclosure/2021/Sep/33mailing-list, x-refsource-fulldisc, third-party-advisory
- http://seclists.org/fulldisclosure/2021/Sep/34mailing-list, x-refsource-fulldisc, third-party-advisory
- http://seclists.org/fulldisclosure/2021/Sep/40mailing-list, x-refsource-fulldisc, third-party-advisory
- http://seclists.org/fulldisclosure/2021/Sep/35mailing-list, x-refsource-fulldisc, third-party-advisory
- http://seclists.org/fulldisclosure/2021/Sep/38mailing-list, x-refsource-fulldisc, third-party-advisory
- http://seclists.org/fulldisclosure/2021/Sep/39mailing-list, x-refsource-fulldisc, third-party-advisory
- https://lists.apache.org/thread.html/r41eca5f4f09e74436cbb05dec450fc2bef37b5d3e966aa7cc5fada6d%40%3Cannounce.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rfb2c193360436e230b85547e85a41bea0916916f96c501f5b6fc4702%40%3Cusers.openoffice.apache.org%3Emailing-list, x-refsource-mlist
- http://www.openwall.com/lists/oss-security/2021/10/07/4mailing-list, x-refsource-mlist, third-party-advisory
- http://seclists.org/fulldisclosure/2021/Oct/62mailing-list, x-refsource-fulldisc, third-party-advisory
- http://seclists.org/fulldisclosure/2021/Oct/63mailing-list, x-refsource-fulldisc, third-party-advisory
- http://seclists.org/fulldisclosure/2021/Oct/61mailing-list, x-refsource-fulldisc, third-party-advisory
- https://github.com/libexpat/libexpat/blob/R_2_4_1/expat/Changes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.