#VU54639 Resource exhaustion in Elasticsearch - CVE-2021-22144

Vulnerability identifier: #VU54639

Vulnerability risk: Medium

CVSSv4.0: 5.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/U:Green]

CVE-ID: CVE-2021-22144

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Elasticsearch
Web applications / Other software

Vendor: Elastic Stack

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to an uncontrolled recursion issue in the Elasticsearch Grok parser. A remote authenticated attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Elasticsearch: 6.8.0 - 6.8.16, 7.13.0 - 7.13.2

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External links
https://www.elastic.co/community/security#ESA-2021-15

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.