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Servers and applications

CVE-2018-20843

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).

Severity
High 7.5
Published
24 Jun 2019
Last changed
14 Oct 2026
Added to UpHeron
1 Nov 2026
Fixed in
2.2.7
Exploit chance
7.1% in the next 30 daysHigher than 94% of CVEs. EPSS by FIRST, 10 Nov 2026
Weakness
XML external entities (XXE) (CWE-611)
Attack
Over the network · No login needed · No user action needed
Attacker can
Take it down
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Sources
NVD

Affected software

SoftwareAffected versions
ExpatServers and applications · cpe:a:libexpat_project:libexpat
  • Every version before 2.2.7

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2018-20843
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2018-20843