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TI-2020-06919 Aliases CVE-2020-8631GHSA-2r47-hhff-7qcp

cloud-init through 19.4 relies on Mersenne Twister for a random password, which makes it…

Priority LOW 25CWE-330Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 2 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

cloud-init through 19.4 relies on Mersenne Twister for a random password, which makes it easier for attackers to predict passwords, because rand_str in cloudinit/util.py calls the random.choice function.

Why it matters now

EPSS 0.00435 37th percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 2 fixed, 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:canonical:cloud-init:*:*:*:*:*:*:*:*up to 19.4VulnerableCanonical
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*15.1VulnerableopenSUSE
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*8.0VulnerableDebian
  • cpe:2.3:a:canonical:cloud-init:*:*:*:*:*:*:*:* Versions up to 19.4 Vulnerable ·Canonical
  • cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* Versions 15.1 Vulnerable ·openSUSE
  • cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian

Remediation

Red Hat 2 advisories

  • RHSA-2020:4650 Released 2020-11-04 · Red Hat rating Moderate
    cloud-init security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) cloud-init-19.4-11.el8
  • RHSA-2020:3898 Released 2020-09-29 · Red Hat rating Moderate
    cloud-init security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Server (v. 7) cloud-init-19.4-7.el7

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2020:4650
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2020:3898

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-8631
  2. 2026-10-03 Alias added: GHSA-2r47-hhff-7qcp

References

Patch 2

Advisory 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences