Vulnerability identifier: #VU10425

Vulnerability risk: Medium

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenBSD
Operating systems & Components / Operating system

Vendor: OpenBSD

Description
The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists due to improper input validation. A remote attacker can supply specially crafted IPv6 fragments, incorrectly access memory of an mbuf chain that is not within an mbuf and cause the kernel to crash.

Mitigation
Install update from vendor's website.

Vulnerable software versions

OpenBSD: 6.1 - 6.2

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External links
http://www.openbsd.org/errata61.html
http://www.openbsd.org/errata62.html
http://ftp.openbsd.org/pub/OpenBSD/patches/6.1/common/035_prevhdr.patch.sig

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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.