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CVE-2021-37624

7.5 · HIGH

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware.

Published Oct 25, 2021CWE-287EPSS 3.75%

Overview

CVE-2021-37624 is a high-severity vulnerability. It was published on October 25, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.10.7, FreeSWITCH does not authenticate SIP MESSAGE requests, leading to spam and message spoofing. By default, SIP requests of the type MESSAGE (RFC 3428) are not authenticated in the affected versions of FreeSWITCH. MESSAGE requests are relayed to SIP user agents registered with the FreeSWITCH server without requiring any authentication. Although this behaviour can be changed by setting the `auth-messages` parameter to `true`, it is not the default setting. Abuse of this security issue allows attackers to send SIP MESSAGE messages to any SIP user agent that is registered with the server without requiring authentication. Additionally, since no authentication is required, chat messages can be spoofed to appear to come from trusted entities. Therefore, abuse can lead to spam and enable soc

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refpacketstormsecurity.com/files/164628/FreeSWITCH-1.10.6-Missing-SIP-MESSAGE-Authentication.htmlRefseclists.org/fulldisclosure/2021/Oct/44Refwww.openwall.com/lists/oss-security/2021/10/25/6GitHubgithub.com/signalwire/freeswitch/releases/tag/v1.10.7GitHubgithub.com/signalwire/freeswitch/security/advisories/GHSA-mjcm-q9h8-9xv3Refpacketstormsecurity.com/files/164628/FreeSWITCH-1.10.6-Missing-SIP-MESSAGE-Authentication.htmlRefseclists.org/fulldisclosure/2021/Oct/44Refwww.openwall.com/lists/oss-security/2021/10/25/6GitHubgithub.com/signalwire/freeswitch/releases/tag/v1.10.7GitHubgithub.com/signalwire/freeswitch/security/advisories/GHSA-mjcm-q9h8-9xv3

How CyberStrike helps

Frequently asked questions

What is CVE-2021-37624?

CVE-2021-37624 is a high-severity vulnerability. It was published on October 25, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-37624?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-37624?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-37624?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-37624 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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