CVE-2021-31819 json
Remote Code Execution in Halibut
published 5y ago modified 4mo ago also GHSA-hpf7-4c2g-9chf , EUVD-2021-2073
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.4%
- EPSS 2.4% chance of exploitation in 30 days, percentile 83%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- nuget Halibut 4.4.7
- Octopus Deploy Halibut 4.4.7
Is CVE-2021-31819 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerVendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2021-31819 updated cvss 8.1
halibut: deserialisation vulnerability that could allow remote code execution
-
Red Hat All currently supported Red Hat productsnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
2.36% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 10.0 | AV:N/AC:L/Au:N/C:C/I:C/A:C |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| nuget | Halibut | <4.4.7 |
4.4.7 |
Affected products
- Octopus Deploy Halibut
Classification
- Weakness
-
- CWE-502 Deserialization of Untrusted Data
References
- advisories.octopus.com /adv/2021-08---Remote-Code-Execution-via-Deserialisation-in-the-Halibut-Protocol-%28CVE-2021-31819%29.22503096
-
nvd.nist.gov
/vuln/detail/CVE-2021-31819
advisory
-
advisories.octopus.com
/adv/2021-08---Remote-Code-Execution-via-Deserialisation-in-the-Halibut-Protocol-(CVE-2021-31819).2250309681.h
web
-
github.com
/OctopusDeploy/Halibut
package
Sources
- CVE List CVE-2021-31819
- GitHub Advisory GHSA-hpf7-4c2g-9chf
- NVD CVE-2021-31819
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