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In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).

CVE-2018-20843 is a vulnerability found in the libexpat XML parsing library, specifically in versions prior to 2.2.7. The issue arises when the XML input contains XML names with an excessive number of colon characters. This malformed input causes the parser to consume an abnormally high amount of RAM and CPU resources during processing. The excessive resource consumption can lead to a denial-of-service (DoS) condition, where the affected system becomes unresponsive or significantly degraded in performance. The vulnerability is classified under CWE-611, which relates to improper restriction of XML external entity references and related XML parsing issues. The CVSS v3.1 base score is 7.5, indicating a high severity level. The attack vector is network-based (AV:N), requires no privileges (PR:N), no user interaction (UI:N), and impacts availability only (A:H), without affecting confidentiality or integrity. There are no known exploits in the wild reported, and no specific vendor or product is identified since libexpat is a widely used open-source XML parser embedded in many software products and systems. The vulnerability is particularly relevant for any application or service that processes XML data using a vulnerable version of libexpat, as specially crafted XML inputs could be used by attackers to exhaust system resources and cause service outages.

Detailed information about CVE-2018-20843: n/a in n/a affecting n/a n/a. Get real-time updates, technical details, and mitigation strategies.

CVE-2018-20843: n/a in n/a - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2018-20843: n/a in n/a

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