What is CVE-2021-31819?

CVE-2021-31819 is a critical-severity vulnerability in Octopus Halibut, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2021-09-22.

How severe is CVE-2021-31819?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-31819 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Deserialization in Octopus Halibut

CVE-2021-31819

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.

Vulnerability class: Insecure Deserialization

EPSS: 0.024 (82.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Octopus Halibut
Octopus Deploy Halibut — versions unspecified

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

Public proof-of-concept exploits

Seanland/snyk-vuln-hunter

References

security@octopus.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2021-31819?: CVE-2021-31819 is a critical-severity vulnerability in Octopus Halibut, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2021-09-22.
How severe is CVE-2021-31819?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-31819 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.