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CVE-2021-3429

sensitive data exposure in cloud-init logs

MEDIUM
5.5
CVSS Score
Published: April 19, 2023 at 09:42 PM UTC
Updated: June 17, 2026 at 04:05 AM UTC
1 product affected across 1 vendorCloud Init

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

When instructing cloud-init to set a random password for a new user account, versions before 21.2 would write that password to the world-readable log file /var/log/cloud-init-output.log. This could allow a local user to log in as another user.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Cloud Init· Canonical
95%
v < 21.2
Affected range stops below 21.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Patch
Source: [email protected]
https://github.com/canonical/cloud-init/commit/b794d426b9ab43ea9d6371477466070d86e10668

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUMcanonical
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-532

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