TI-2022-14802 Aliases CVE-2022-33684 GHSA-5r3h-c3r7-9w4h

Improper certificate validation in Apache Pulsar

LOW 39CWE-295Published 2022-11-04 · Updated 2025-05-02

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: Spoofing
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub. Impact type from CWE-295.

Summary

The Apache Pulsar C++ Client does not verify peer TLS certificates when making HTTPS calls for the OAuth2.0 Client Credential Flow, even when tlsAllowInsecureConnection is disabled via configuration. This vulnerability allows an attacker to perform a man in the middle attack and intercept and/or modify the GET request that is sent to the ClientCredentialFlow 'issuer url'. The intercepted credentials can be used to acquire authentication data from the OAuth2.0 server to then authenticate with an Apache Pulsar cluster. An attacker can only take advantage of this vulnerability by taking control of a machine 'between' the client and the server. The attacker must then actively manipulate traffic to perform the attack. The Apache Pulsar Python Client wraps the C++ client, so it is also vulnerable in the same way. This issue affects Apache Pulsar C++ Client and Python Client versions 2.7.0 to 2.7.4; 2.8.0 to 2.8.3; 2.9.0 to 2.9.2; 2.10.0 to 2.10.1; 2.6.4 and earlier. Any users running affected versions of the C++ Client or the Python Client should rotate vulnerable OAuth2.0 credentials, including client_id and client_secret. 2.7 C++ and Python Client users should upgrade to 2.7.5 and rotate vulnerable OAuth2.0 credentials. 2.8 C++ and Python Client users should upgrade to 2.8.4 and rotate vulnerable OAuth2.0 credentials. 2.9 C++ and Python Client users should upgrade to 2.9.3 and rotate vulnerable OAuth2.0 credentials. 2.10 C++ and Python Client users should upgrade to 2.10.2 and rotate vulnerable OAuth2.0 credentials. 3.0 C++ users are unaffected and 3.0 Python Client users will be unaffected when it is released. Any users running the C++ and Python Client for 2.6 or less should upgrade to one of the above patched versions.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00929 60th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed Apache Pulsar (Apache Software Foundation): 3.0.0pulsar-client (PyPI): 2.7.5, 2.8.4, 2.9.3 +1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Apache	Apache Pulsar	2.7 – 2.7.4; 2.8 – 2.8.3; 2.9 – 2.9.2; 2.10 – 2.10.1; 2.6 and earlier – 2.6.4	3.0.0	Patch available	CNA
—	pulsar-client (PyPI)	before 2.7.5	2.7.5	Patch available	GHSA-5r3h-c3r7-9w4h
—	pulsar-client (PyPI)	2.8.0 to before 2.8.4	2.8.4	Patch available	GHSA-5r3h-c3r7-9w4h
—	pulsar-client (PyPI)	2.9.0 to before 2.9.3	2.9.3	Patch available	GHSA-5r3h-c3r7-9w4h
—	pulsar-client (PyPI)	2.10.0 to before 2.10.2	2.10.2	Patch available	GHSA-5r3h-c3r7-9w4h

Apache Pulsar VendorApache Affected 2.7 – 2.7.4; 2.8 – 2.8.3; 2.9 – 2.9.2; 2.10 – 2.10.1; 2.6 and earlier – 2.6.4 Fixed in 3.0.0 Patch available CNA
pulsar-client (PyPI) Vendor— Affected before 2.7.5 Fixed in 2.7.5 Patch available GHSA-5r3h-c3r7-9w4h
pulsar-client (PyPI) Vendor— Affected 2.8.0 to before 2.8.4 Fixed in 2.8.4 Patch available GHSA-5r3h-c3r7-9w4h
pulsar-client (PyPI) Vendor— Affected 2.9.0 to before 2.9.3 Fixed in 2.9.3 Patch available GHSA-5r3h-c3r7-9w4h
pulsar-client (PyPI) Vendor— Affected 2.10.0 to before 2.10.2 Fixed in 2.10.2 Patch available GHSA-5r3h-c3r7-9w4h

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:apache:pulsar::::::::	up to 2.6.4; 2.7.0 to before 2.7.5; 2.8.0 to before 2.8.4; 2.9.0 to before 2.9.3; 2.10.0 to before 2.10.2	Vulnerable	Apache

cpe:2.3:a:apache:pulsar:*:*:*:*:*:*:*:* Versions up to 2.6.4; 2.7.0 to before 2.7.5; 2.8.0 to before 2.8.4; 2.9.0 to before 2.9.3; 2.10.0 to before 2.10.2 Vulnerable ·Apache

Remediation

Fix · CNA Apache Pulsar (Apache Software Foundation) Fixed in 3.0.0
Fix · GHSA-5r3h-c3r7-9w4h pulsar-client (PyPI) Fixed in 2.7.5 Advisory →
Fix · GHSA-5r3h-c3r7-9w4h pulsar-client (PyPI) Fixed in 2.8.4 Advisory →
Fix · GHSA-5r3h-c3r7-9w4h pulsar-client (PyPI) Fixed in 2.9.3 Advisory →
Fix · GHSA-5r3h-c3r7-9w4h pulsar-client (PyPI) Fixed in 2.10.2 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2022-33684
2026-10-03 Alias added: GHSA-5r3h-c3r7-9w4h

References

Exploit 1

https://huntr.dev/bounties/df89b724-3201-47aa-b8cd-282e112a566f

Advisory 2

Other 2

TI-2024-18155 Apache Pulsar: Pulsar Functions Worker's Archive Extraction Vulnerability Allows Unauthorized File Modification CVSS 3.1CRITICAL 9.9
TI-2021-05150 Authentication with JWT allows use of “none”-algorithm CVSS 3.1CRITICAL 9.8
TI-2024-17990 Apache Pulsar: Improper Input Validation in Pulsar Function Worker allows Remote Code Execution CVSS 3.1CRITICAL 9.9
TI-2023-14272 Apache Pulsar: Incorrect Authorization for Function Worker when using mTLS Authentication through Pulsar Proxy CVSS 3.1CRITICAL 9.6
TI-2022-15232 Apache Pulsar: Improper Authentication for Pulsar Proxy Statistics Endpoint CVSS 3.1HIGH 8.2
TI-2024-18500 Apache Pulsar: Pulsar Functions Worker Allows Unauthorized File Access and Unauthorized HTTP/HTTPS Proxying CVSS 3.1HIGH 8.8

See all 19 →

Sources

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