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CVE-2022-33682

Disabled Hostname Verification makes Brokers, Proxies vulnerable to MITM attack

5.9 MediumFix available

TLS hostname verification cannot be enabled in the Pulsar Broker's Java Client, the Pulsar Broker's Java Admin Client, the Pulsar WebSocket Proxy's Java Client, and the Pulsar Proxy's Admin Client leaving intra-cluster connections and geo-replication connections vulnerable to man in the middle attacks, which could leak credentials, configuration data, message data, and any other data sent by these clients. The vulnerability is for both the pulsar+ssl protocol and HTTPS. 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 by providing the client with a cryptographically valid certificate for an unrelated host. This issue affects Apache Pulsar Broker, Proxy, and WebSocket Proxy 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; 2.6.4 and earlier.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.72%Down 0.2 points since Sep 24, 2022
90%50%10%1%

What each source reports

NVD Score used 5.9

TLS hostname verification cannot be enabled in the Pulsar Broker's Java Client, the Pulsar Broker's Java Admin Client, the Pulsar WebSocket Proxy's Java Client, and the Pulsar Proxy's Admin Client leaving intra-cluster connections and geo-replication connections vulnerable to man in the middle attacks, which could leak credentials, configuration data, message data, and any other data sent by these clients. The vulnerability is for both the pulsar+ssl protocol and HTTPS. 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 by providing the client with a cryptographically valid certificate for an unrelated host. This issue affects Apache Pulsar Broker, Proxy, and WebSocket Proxy 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; 2.6.4 and earlier.

Record
CVE-2022-33682
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-295
Updated
2026-11-02
CVE List 5.9

Disabled Hostname Verification makes Brokers, Proxies vulnerable to MITM attack

TLS hostname verification cannot be enabled in the Pulsar Broker's Java Client, the Pulsar Broker's Java Admin Client, the Pulsar WebSocket Proxy's Java Client, and the Pulsar Proxy's Admin Client leaving intra-cluster connections and geo-replication connections vulnerable to man in the middle attacks, which could leak credentials, configuration data, message data, and any other data sent by these clients. The vulnerability is for both the pulsar+ssl protocol and HTTPS. 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 by providing the client with a cryptographically valid certificate for an unrelated host. This issue affects Apache Pulsar Broker, Proxy, and WebSocket Proxy 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; 2.6.4 and earlier.

Record
CVE-2022-33682
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-295, CWE-295
Updated
2026-11-02
EUVDEUVD-2022-6863 5.9

TLS hostname verification cannot be enabled in the Pulsar Broker's Java Client, the Pulsar Broker's Java Admin Client, the Pulsar WebSocket Proxy's Java Client, and the Pulsar Proxy's Admin Client leaving intra-cluster connections and geo-replication connections vulnerable to man in the middle attacks, which could leak credentials, configuration data, message data, and any other data sent by these clients. The vulnerability is for both the pulsar+ssl protocol and HTTPS. 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 by providing the client with a cryptographically valid certificate for an unrelated host. This issue affects Apache Pulsar Broker, Proxy, and WebSocket Proxy 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; 2.6.4 and earlier.

Record
EUVD-2022-6863
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-jvf3-mfxv-jcqr 5.9

Apache Pulsar Broker, Proxy, and WebSocket Proxy vulnerable to Improper Certificate Validation

TLS hostname verification cannot be enabled in the Pulsar Broker's Java Client, the Pulsar Broker's Java Admin Client, the Pulsar WebSocket Proxy's Java Client, and the Pulsar Proxy's Admin Client leaving intra-cluster connections and geo-replication connections vulnerable to man in the middle attacks, which could leak credentials, configuration data, message data, and any other data sent by these clients. The vulnerability is for both the pulsar+ssl protocol and HTTPS. 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 by providing the client with a cryptographically valid certificate for an unrelated host. This issue affects Apache Pulsar Broker, Proxy, and WebSocket Proxy 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; 2.6.4 and earlier.

Record
GHSA-jvf3-mfxv-jcqr
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-295
Updated
2026-11-02
OSV 5.9

Disabled Hostname Verification makes Brokers, Proxies vulnerable to MITM attack

TLS hostname verification cannot be enabled in the Pulsar Broker's Java Client, the Pulsar Broker's Java Admin Client, the Pulsar WebSocket Proxy's Java Client, and the Pulsar Proxy's Admin Client leaving intra-cluster connections and geo-replication connections vulnerable to man in the middle attacks, which could leak credentials, configuration data, message data, and any other data sent by these clients. The vulnerability is for both the pulsar+ssl protocol and HTTPS. 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 by providing the client with a cryptographically valid certificate for an unrelated host. This issue affects Apache Pulsar Broker, Proxy, and WebSocket Proxy 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; 2.6.4 and earlier.

Record
CVE-2022-33682
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-295
Updated
2026-11-02
OSVGHSA-jvf3-mfxv-jcqr 5.9

Apache Pulsar Broker, Proxy, and WebSocket Proxy vulnerable to Improper Certificate Validation

TLS hostname verification cannot be enabled in the Pulsar Broker's Java Client, the Pulsar Broker's Java Admin Client, the Pulsar WebSocket Proxy's Java Client, and the Pulsar Proxy's Admin Client leaving intra-cluster connections and geo-replication connections vulnerable to man in the middle attacks, which could leak credentials, configuration data, message data, and any other data sent by these clients. The vulnerability is for both the pulsar+ssl protocol and HTTPS. 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 by providing the client with a cryptographically valid certificate for an unrelated host. This issue affects Apache Pulsar Broker, Proxy, and WebSocket Proxy 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; 2.6.4 and earlier.

Record
GHSA-jvf3-mfxv-jcqr
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-295
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
org.apache.pulsar:pulsar-broker
Maven
before 2.7.5
2.7.5
org.apache.pulsar:pulsar-proxy
Maven
before 2.7.5
2.7.5
org.apache.pulsar:pulsar-broker
Maven
2.8.0 up to 2.8.4
2.8.4
org.apache.pulsar:pulsar-proxy
Maven
2.8.0 up to 2.8.4
2.8.4
org.apache.pulsar:pulsar-broker
Maven
2.9.0 up to 2.9.3
2.9.3
org.apache.pulsar:pulsar-proxy
Maven
2.9.0 up to 2.9.3
2.9.3
org.apache.pulsar:pulsar-broker
Maven
2.10.0 to 2.10.0
2.10.1
org.apache.pulsar:pulsar-proxy
Maven
2.10.0 to 2.10.0
2.10.1
org.apache.pulsar:pulsar-broker
Maven
before 2.7.5, plus listed versions
1.19.0-incubating1.20.0-incubating1.21.0-incubating1.22.0-incubating1.22.1-incubating
Show 25 moreShow less
2.0.0-rc1-incubating2.0.1-incubating2.1.0-incubating2.1.1-incubating2.2.02.2.12.3.02.3.12.3.22.4.02.4.12.4.22.5.02.5.12.5.22.6.02.6.12.6.22.6.32.6.42.7.02.7.12.7.22.7.32.7.4
2.7.5
org.apache.pulsar:pulsar-proxy
Maven
before 2.7.5, plus listed versions
1.19.0-incubating1.20.0-incubating1.21.0-incubating1.22.0-incubating1.22.1-incubating
Show 25 moreShow less
2.0.0-rc1-incubating2.0.1-incubating2.1.0-incubating2.1.1-incubating2.2.02.2.12.3.02.3.12.3.22.4.02.4.12.4.22.5.02.5.12.5.22.6.02.6.12.6.22.6.32.6.42.7.02.7.12.7.22.7.32.7.4
2.7.5
Show 6 moreShow less
Affected packages
PackageAffectedFixed
org.apache.pulsar:pulsar-broker
Maven
2.8.0 up to 2.8.4, plus listed versions
2.8.12.8.22.8.3
2.8.4
org.apache.pulsar:pulsar-proxy
Maven
2.8.0 up to 2.8.4, plus listed versions
2.8.12.8.22.8.3
2.8.4
org.apache.pulsar:pulsar-broker
Maven
2.9.0 up to 2.9.3, plus listed versions
2.9.12.9.2
2.9.3
org.apache.pulsar:pulsar-proxy
Maven
2.9.0 up to 2.9.3, plus listed versions
2.9.12.9.2
2.9.3
org.apache.pulsar:pulsar-broker
Maven
2.10.0 up to 2.10.1
2.10.1
org.apache.pulsar:pulsar-proxy
Maven
2.10.0 up to 2.10.1
2.10.1

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

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

In short

CVE-2022-33682 is a medium vulnerability (CVSS 5.9) in Apache Pulsar, published September 23, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.72%, the 54th percentile. Fixed in org.apache.pulsar:pulsar-broker 2.7.5.

References

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