CVE-2020-27349

aptdaemon performed policykit permissions checks too late

5.5 MediumFix available

Aptdaemon performed policykit checks after interacting with potentially untrusted files with elevated privileges. This affected versions prior to 1.1.1+bzr982-0ubuntu34.1, 1.1.1+bzr982-0ubuntu32.3, 1.1.1+bzr982-0ubuntu19.5, 1.1.1+bzr982-0ubuntu14.5.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.29%Down 0.3 points since Apr 14, 2021

What each source reports

NVD Score used 5.5

Record: CVE-2020-27349
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 2.1 LowAV:L/AC:L/Au:N/C:N/I:N/A:P
Weakness: CWE-862
Updated: 2026-11-02

CVE List No score

aptdaemon performed policykit permissions checks too late

Record: CVE-2020-27349
Weakness: CWE-862
Updated: 2026-11-02

EUVDEUVD-2020-19861 No score

Record: EUVD-2020-19861
Updated: 2026-11-03

GitHub AdvisoriesGHSA-qxjq-5hf8-7hff No score

Aptdaemon performed policykit checks after interacting with potentially untrusted files with...

Record: GHSA-qxjq-5hf8-7hff
Weakness: CWE-862
Updated: 2026-11-02

OSVUBUNTU-CVE-2020-27349 5.5

Record: UBUNTU-CVE-2020-27349
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUSN-4664-1 No score

aptdaemon vulnerabilities

Kevin Backhouse discovered that Aptdaemon incorrectly handled certain properties. A local attacker could use this issue to test for the presence of local files. (CVE-2020-16128)

Kevin Backhouse discovered that Aptdaemon incorrectly handled permission checks. A local attacker could possibly use this issue to cause a denial of service. (CVE-2020-27349)

Record: USN-4664-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`aptdaemon` Ubuntu:16.04:LTS	before 1.1.1+bzr982-0ubuntu14.5, plus listed versions 1.1.1+bzr982-0ubuntu141.1.1+bzr982-0ubuntu14.11.1.1+bzr982-0ubuntu14.21.1.1+bzr982-0ubuntu14.31.1.1+bzr982-0ubuntu14.4	1.1.1+bzr982-0ubuntu14.5
`aptdaemon` Ubuntu:18.04:LTS	before 1.1.1+bzr982-0ubuntu19.5, plus listed versions 1.1.1+bzr982-0ubuntu171.1.1+bzr982-0ubuntu191.1.1+bzr982-0ubuntu19.11.1.1+bzr982-0ubuntu19.21.1.1+bzr982-0ubuntu19.31.1.1+bzr982-0ubuntu19.4	1.1.1+bzr982-0ubuntu19.5
`aptdaemon` Ubuntu:20.04:LTS	before 1.1.1+bzr982-0ubuntu32.3, plus listed versions 1.1.1+bzr982-0ubuntu281.1.1+bzr982-0ubuntu301.1.1+bzr982-0ubuntu311.1.1+bzr982-0ubuntu321.1.1+bzr982-0ubuntu32.11.1.1+bzr982-0ubuntu32.2	1.1.1+bzr982-0ubuntu32.3
`aptdaemon` Ubuntu:16.04:LTS From an advisory covering 2 CVEs	before 1.1.1+bzr982-0ubuntu14.5, plus listed versions 1.1.1+bzr982-0ubuntu141.1.1+bzr982-0ubuntu14.11.1.1+bzr982-0ubuntu14.21.1.1+bzr982-0ubuntu14.31.1.1+bzr982-0ubuntu14.4	1.1.1+bzr982-0ubuntu14.5
`aptdaemon` Ubuntu:18.04:LTS From an advisory covering 2 CVEs	before 1.1.1+bzr982-0ubuntu19.5, plus listed versions 1.1.1+bzr982-0ubuntu171.1.1+bzr982-0ubuntu191.1.1+bzr982-0ubuntu19.11.1.1+bzr982-0ubuntu19.21.1.1+bzr982-0ubuntu19.31.1.1+bzr982-0ubuntu19.4	1.1.1+bzr982-0ubuntu19.5
`aptdaemon` Ubuntu:20.04:LTS From an advisory covering 2 CVEs	before 1.1.1+bzr982-0ubuntu32.3, plus listed versions 1.1.1+bzr982-0ubuntu281.1.1+bzr982-0ubuntu301.1.1+bzr982-0ubuntu311.1.1+bzr982-0ubuntu321.1.1+bzr982-0ubuntu32.11.1.1+bzr982-0ubuntu32.2	1.1.1+bzr982-0ubuntu32.3

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-27349 is a medium vulnerability (CVSS 5.5) in Canonical Aptdaemon, published December 8, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.29%, the 21st percentile. Fixed in aptdaemon 1.1.1+bzr982-0ubuntu14.5.