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CVE-2021-22160

CRITICALCVSS 9.8/10EPSS 52.93%

Last modified

CVE-2021-22160 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 52.93% chance of exploitation in the next 30 days.

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).

Metrics

CVSS 3.1
9.8/10

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

EPSS Probability
52.93%

98.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
ApachePulsar< 2.7.1

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-22160?
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).
How severe is CVE-2021-22160?
CVE-2021-22160 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 52.93% probability of exploitation in the next 30 days.
How do I fix CVE-2021-22160?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-22160?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST