CVE-2023-37544

Apache Pulsar WebSocket Proxy: Improper Authentication for WebSocket Proxy Endpoint Allows DoS

HIGH
7.5
CVSS Score
Published: December 20, 2023 at 08:34 AM UTC
Updated: June 17, 2026 at 06:08 AM UTC
1 product affected across 1 vendorPulsar

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Severity
HIGH7.5
Exploit prediction
EPSS 1%

Description

Improper Authentication vulnerability in Apache Pulsar WebSocket Proxy allows an attacker to connect to the /pingpong endpoint without authentication. This issue affects Apache Pulsar WebSocket Proxy: from 2.8.0 through 2.8.*, from 2.9.0 through 2.9.*, from 2.10.0 through 2.10.4, from 2.11.0 through 2.11.1, 3.0.0. The known risks include a denial of service due to the WebSocket Proxy accepting any connections, and excessive data transfer due to misuse of the WebSocket ping/pong feature. 2.10 Pulsar WebSocket Proxy users should upgrade to at least 2.10.5. 2.11 Pulsar WebSocket Proxy users should upgrade to at least 2.11.2. 3.0 Pulsar WebSocket Proxy users should upgrade to at least 3.0.1. 3.1 Pulsar WebSocket Proxy users are unaffected. Any users running the Pulsar WebSocket Proxy for 2.8, 2.9, and earlier should upgrade to one of the above patched versions.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 2.10.52.10.0 ≤ v ≤ 2.10.42.11.0 ≤ v ≤ 2.11.12.11.0 ≤ v < 2.11.22.8.0 ≤ v ≤ 2.8.*2.9.0 ≤ v ≤ 2.9.*2.10.02.11.02.8.02.9.03.0.0
Affected range stops below 2.10.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.11.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

7.5HIGHapache
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-287

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