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Fencer Vulns
medium 5.1

CVE-2019-0816 json

A security feature bypass exists in Azure SSH Keypairs, due to a change in the provisioning logic for some Linux images that use cloud-init…

published 2019-04-09 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-1569

cvss
5.1
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

A security feature bypass exists in Azure SSH Keypairs, due to a change in the provisioning logic for some Linux images that use cloud-init, aka 'Azure SSH Keypairs Security Feature Bypass Vulnerability'.

Patch / fix

  • cloud-init Debian 14, Debian 13, Debian 12 18.3-6

debian advisories DEBIAN-CVE-2019-0816

  • cloud-init Ubuntu 16.04 LTS 18.5-45-g3554ffe8-0ubuntu1~16.04.1
  • cloud-init Ubuntu 18.04 LTS 18.5-45-g3554ffe8-0ubuntu1~18.04.1

ubuntu advisories UBUNTU-CVE-2019-0816

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • cloud-init RHEL 8 18.5-1.el8.4
  • cloud-init RHEL 7 18.2-1.el7_6.2

red hat advisories RHBA-2019:1992RHSA-2019:0597

  • cloud-init SLE Module for Public Cloud 12 19.2-37.33.1
  • cloud-init SLE Module for Public Cloud 15 19.2-5.18.1
  • cloud-init SLE Module for Public Cloud 15 SP1 19.2-8.11.1

suse advisories SUSE-SU-2019:3191-1SUSE-SU-2019:3097-1SUSE-SU-2019:3096-1

  • cloud-init openSUSE Tumbleweed 21.2-1.2
  • cloud-init openSUSE Leap 15.1 19.2-lp151.2.9.1

opensuse advisories openSUSE-SU-2024:10688-1openSUSE-SU-2019:2633-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-0816 updated cvss 5.4

cloud-init: extra ssh keys added to authorized_keys on the Azure platform

  • Red Hat Enterprise Linux AppStream (v. 8) cloud-init 18.5-1.el8.4
    fixed: vendor fix “See steps from https://support.microsoft.com/en-us/help/4491476/extraneous-ssh-public-keys-added-to-authorized-keys-file-on-linux-vm” RHBA-2019:1992
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) cloud-init 18.2-1.el7_6.2 Red Hat Enterprise Linux Server (v. 7) cloud-init 18.2-1.el7_6.2
    fixed: vendor fix “See steps from https://support.microsoft.com/en-us/help/4491476/extraneous-ssh-public-keys-added-to-authorized-keys-file-on-linux-vm” RHSA-2019:0597

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

1.40% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 5.1 CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 1.9 AV:L/AC:M/Au:N/C:N/I:P/A:N

Affected products

  • Microsoft Ubuntu Server

Classification

Weakness
  • CWE-706 Use of Incorrectly-Resolved Name or Reference

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.