#VU60527 Resource exhaustion in xstream - CVE-2021-43859

Vulnerability identifier: #VU60527

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-43859

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
xstream
Universal components / Libraries / Libraries used by multiple products

Vendor: XStream

Description

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

The vulnerability exists due to application does not properly control consumption of internal resources. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

xstream: 1.4 - 1.4.18

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External links
https://github.com/x-stream/xstream/security/advisories/GHSA-rmr5-cpv2-vgjf
https://x-stream.github.io/CVE-2021-43859.html
https://github.com/x-stream/xstream/commit/e8e88621ba1c85ac3b8620337dd672e0c0c3a846
https://www.openwall.com/lists/oss-security/2022/02/09/1

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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