Is CVE-2021-3560 in the CISA KEV catalog?

Yes. CVE-2021-3560 is on the CISA Known Exploited Vulnerabilities list, added 2023-05-12.

What is the CVSS severity of CVE-2021-3560?

CVE-2021-3560 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-3560?

CVE-2021-3560 has an EPSS score of 22.19% (97th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3560?

Upgrade policykit-1 on debian 11 to 0.105-31 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3560

HIGHCISA KEVEPSS 97th pctl

7.8

CVSS v3

NVD

Description

It was found that polkit could be tricked into bypassing the credential checks for D-Bus requests, elevating the privileges of the requestor to the root user. This flaw could be used by an unprivileged local attacker to, for example, create a new local administrator. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CWE-863Incorrect Authorization CWE-754

How to fix

Remediation Available

policykit-1Debian

Fixed in:0.105-31CVE-2021-3560

libpolkit-agent-1-0Ubuntu

Fixed in:0.105-26ubuntu1.1USN-4980-1

libpolkit-gobject-1-0Ubuntu

Fixed in:0.105-26ubuntu1.1USN-4980-1

policykit-1Ubuntu

Fixed in:0.105-26ubuntu1.1USN-4980-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

22.19%probability of exploitation in 30 days

97thpercentile

Very high risk: more likely to be exploited than 97% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Red Hat Polkit Incorrect Authorization Vulnerability

Red Hat Polkit contains an incorrect authorization vulnerability through the bypassing of credential checks for D-Bus requests, allowing for privilege escalation.

Apply updates per vendor instructions.

Remediation due: 2023-06-02

References

Patch1

bugzilla.redhat.com

Exploit1

github.blog

Third-Party Advisory2

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-863 (Incorrect Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-22518	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-38035	Critical	9.8	100%	KEV + Ransom	-
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2024-38856	Critical	9.8	99%	KEV	Fix
CVE-2025-29927	Critical	9.1	99%	-	Fix
CVE-2020-36289	Medium	5.3	99%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-06.