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Vulnerability of OpenBSD: denial of service via Unwind Large DNS Replies

Synthesis of the vulnerability 

An attacker can trigger a fatal error via Unwind Large DNS Replies of OpenBSD, in order to trigger a denial of service.
Vulnerable products: OpenBSD.
Severity of this weakness: 2/4.
Creation date: 10/11/2020.
Références of this bulletin: VIGILANCE-VUL-33864.

Description of the vulnerability 

An attacker can trigger a fatal error via Unwind Large DNS Replies of OpenBSD, in order to trigger a denial of service.
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This weakness alert impacts software or systems such as OpenBSD.

Our Vigil@nce team determined that the severity of this computer vulnerability note is medium.

The trust level is of type confirmed by the editor, with an origin of internet server.

An attacker with a expert ability can exploit this security bulletin.

Solutions for this threat 

OpenBSD: patch for Unwind Large DNS Replies.
A patch is available:
  https://ftp.openbsd.org/pub/OpenBSD/patches/6.7/common/028_unwind.patch.sig
  https://ftp.openbsd.org/pub/OpenBSD/patches/6.8/common/005_unwind.patch.sig
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