VulnerabilityModified

CVE-2013-0340

MEDIUM 6.8EPSS 19.4%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 19.4%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.

Description

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 2.0: 6.8 MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:P
EPSS: 19.43% probability · 97th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-611
Affected: libexpat project/libexpat · python/python · apple/ipados · apple/iphone os · apple/macos · apple/tvos · apple/watchos
Source: secalert@redhat.com

EPSS trend

EPSS 19.4% since 4 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

http://openwall.com/lists/oss-security/2013/02/22/3Exploit, Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Oct/61Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Oct/62Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Oct/63Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Sep/33Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Sep/34Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Sep/35Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Sep/38Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Sep/39Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Sep/40Mailing List, Third Party Advisory
http://securitytracker.com/id?1028213Third Party Advisory, VDB Entry
http://www.openwall.com/lists/oss-security/2013/04/12/6Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/07/4Mailing List, Third Party Advisory
http://www.osvdb.org/90634Broken Link
http://www.securityfocus.com/bid/58233Broken Link, Third Party Advisory, VDB Entry
https://github.com/libexpat/libexpat/blob/R_2_4_1/expat/Changes
https://lists.apache.org/thread.html/r41eca5f4f09e74436cbb05dec450fc2bef37b5d3e966aa7cc5fada6d%40%3Cannounce.apache.org%3E
https://lists.apache.org/thread.html/rfb2c193360436e230b85547e85a41bea0916916f96c501f5b6fc4702%40%3Cusers.openoffice.apache.org%3E
https://security.gentoo.org/glsa/201701-21Third Party Advisory
https://support.apple.com/kb/HT212804Third Party Advisory
https://support.apple.com/kb/HT212805Third Party Advisory
https://support.apple.com/kb/HT212807Third Party Advisory
https://support.apple.com/kb/HT212814Third Party Advisory
https://support.apple.com/kb/HT212815Third Party Advisory
https://support.apple.com/kb/HT212819Third Party Advisory
http://openwall.com/lists/oss-security/2013/02/22/3Exploit, Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Oct/61Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Oct/62Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Oct/63Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Sep/33Mailing List, Third Party Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.