CVE-2021-22160

Q: How do I fix CVE-2021-22160?

Upgrade pulsar to 2.7.1 or later.

Q: Is CVE-2021-22160 being actively exploited?

Not that we know of. CVE-2021-22160 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 52.9% is the estimated probability that it will be exploited in the next 30 days. That is higher than 99% of all scored CVEs.

Q: How severe is CVE-2021-22160?

CVE-2021-22160 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2021-22160 affect?

Published advisories record a fix for pulsar (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

CRITICALEPSS 99th pctl

9.8

CVSS v3

NVD

Description

If Apache Pulsar is configured to authenticate clients using tokens based on JSON Web Tokens (JWT), the signature of the token is not validated if the algorithm of the presented token is set to "none". This allows an attacker to connect to Pulsar instances as any user (incl. admins).

CWE-347

How to fix

Remediation Available

pulsarNVD

Affected:< 2.7.1Fixed in:2.7.1CVE-2021-22160derived from NVD

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 VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

52.93%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Vendor Advisory2

Other references6

Related Vulnerabilities

Other CWE-347 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2018-16042	Medium	6.5	82%	-	-
CVE-2025-25292	Critical	9.8	65%	-	Fix
CVE-2025-59718	Critical	9.8	63%	KEV	Fix
CVE-2013-3900	Medium	5.5	45%	KEV	-
CVE-2018-0114	High	7.5	43%	-	Fix
CVE-2020-1464	High	7.8	41%	KEV	-

Common questions

How do I fix CVE-2021-22160?

Upgrade pulsar to 2.7.1 or later.

Is CVE-2021-22160 being actively exploited?

Not that we know of. CVE-2021-22160 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 52.9% is the estimated probability that it will be exploited in the next 30 days. That is higher than 99% of all scored CVEs.

How severe is CVE-2021-22160?

CVE-2021-22160 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-22160 affect?

Published advisories record a fix for pulsar (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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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 2024-11-21.