Vulnerability identifier: #VU82991

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-2021-20286

CWE-ID: CWE-617

Exploitation vector: Network

Exploit availability: No

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

Vendor:

Description

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

The vulnerability exists due to a reachable assertion within the nbd_unlocked_opt_go() function in ilb/opt.c. A remote attacker can send specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

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External links
http://bugzilla.redhat.com/show_bug.cgi?id=1934727
http://gitlab.com/nbdkit/libnbd/-/commit/fb4440de9cc76e9c14bd3ddf3333e78621f40ad0

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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.