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).
Published 2019-06-24 17:15:10
Updated 2022-04-18 17:17:06
Source MITRE
View at NVD,   CVE.org
Vulnerability category: XML external entity (XXE) injectionDenial of service

Exploit prediction scoring system (EPSS) score for CVE-2018-20843

Probability of exploitation activity in the next 30 days: 60.91%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 97 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2018-20843

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Source
7.8
HIGH AV:N/AC:L/Au:N/C:N/I:N/A:C
10.0
6.9
nvd@nist.gov
7.5
HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.9
3.6
nvd@nist.gov

CWE ids for CVE-2018-20843

  • The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2018-20843

Products affected by CVE-2018-20843

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