CVE-2018-20843

Advisory lineage Upstream: 0 Downstream: 20
Modified
Published: 24 Jun 2019, 16:06
Last modified:30 May 2025, 19:39

Vulnerability Summary

Overall Risk (default)
medium
42/100
CVSS Score
7.8 HIGH
v2.0 (nvd)
EPSS Score
5.58% LOW
6% probability -0.24%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

24 Jun 2019, 16:06
Published
Vulnerability first disclosed
30 May 2025, 19:39
Last Modified
Vulnerability information updated

Description

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).

CVSS Metrics

  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • v2.0•HIGH•Score: 7.8AV:N/AC:L/Au:N/C:N/I:N/A:C

EPSS Trends

Current EPSS score: 5.58%• Percentile: 90%

Techniques & Countermeasures

  • CWE-611•Improper Restriction of XML External Entity Reference

    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.

Affected Systems

  • canonical•ubuntu_linux

    12.04 | 14.04 | 16.04 | 18.04 | 18.10 | 19.04

  • debian•debian_linux

    8.0 | 9.0

  • fedoraproject•fedora

    29 | 30

  • libexpat_project•libexpat

    < 2.2.7

  • opensuse•leap

    15.0 | 15.1

  • oracle•hospitality_res_3700

    ≥ 5.7, ≤ 5.7.6

  • oracle•http_server

    12.1.3.0 | 12.2.1.4.0

  • oracle•outside_in_technology

    8.5.4 | 8.5.5

  • tenable•nessus

    < 8.15.0

References (21)