Vulnerability identifier: #VU54639

Vulnerability risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

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

---

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

---

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.