CVE-2018-20843

Libexpat vulnerability

CVSS

7.5

EPSS

7.1%

EPSS pct

94th

Exploited

No known

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).

Affected vendor

Libexpat Project

Affected product

Libexpat

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness type (CWE)

CWE-611 — XML External Entity (XXE) Reference

Published

2019-06-24

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 7.1% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 94% of all scored CVEs.

Check your external exposure to CVE-2018-20843

Confirm whether Libexpat Project Libexpat is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2018-20843.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2018-20843

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