CVE-2021-31819

CRITICAL

Octopus Halibut < 4.4.7 - Insecure Deserialization

Title source: rule

Description

In Halibut versions prior to 4.4.7 there is a deserialisation vulnerability that could allow remote code execution on systems that already trust each other based on certificate verification.

References (1)

[Various Sources] https://advisories.octopus.com/adv/2021-08---Remote-Code-Execution-via-Deserialisation-in-the-Halibut-Protocol-%28CVE-2021-31819%29.2250309681.html

Scores

CVSS v3 9.8

EPSS 0.0186

EPSS Percentile 82.9%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Classification

CWE

CWE-502

Status published

Affected Products (2)

octopus/halibut < 4.4.7

nuget/Halibut < 4.4.7NuGet

Timeline

Published Sep 22, 2021

Tracked Since Feb 18, 2026