Vulnerability identifier: #VU55302

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-28903

CWE-ID: CWE-674

Exploitation vector: Network

Exploit availability: No

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

Vendor: CESNET

Description

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

The vulnerability exists due to an uncontrolled recursion in the "lyxml_parse_elem()" function. A remote attacker can cause a denial of service condition on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

libyang: 1.0.109 - 1.0.225

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External links
http://github.com/CESNET/libyang/issues/1453

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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.