CVE-2023-30576: Apache Guacamole: Use-after-free in handling of RDP audio input buffer

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-06-07 · updated 2026-06-17
Weakness: CWE-416

Description

Apache Guacamole 0.9.10 through 1.5.1 may continue to reference a freed RDP audio input buffer. Depending on timing, this may allow an attacker to execute arbitrary code with the privileges of the guacd process.

Affected products

Apache Software Foundation Apache Guacamole: from 0.9.0 before 1.5.2 — fixed in 1.5.2

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Guacamole 1.5.2. Check the vendor advisory for mitigations.

References

https://lists.apache.org/thread/vgtvxb3w7mm84hx6v8dfc0onsoz05gb6
https://lists.apache.org/thread/vgtvxb3w7mm84hx6v8dfc0onsoz05gb6

Get alerted when CVE-2023-30576 or the next vulnerability affects your stack