CVE-2021-41145

Name: CVE-2021-41145
Creator: NVD / NIST
Published: 2021-10-25T22:15:07.777+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.60%

Last modified Jun 17, 2026

CVE-2021-41145 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. FreeSWITCH prior to version 1.10.7 is susceptible to Denial of Service via SIP flooding. EPSS estimates a 1.60% chance of exploitation in the next 30 days.

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. FreeSWITCH prior to version 1.10.7 is susceptible to Denial of Service via SIP flooding. When flooding FreeSWITCH with SIP messages, it was observed that after a number of seconds the process was killed by the operating system due to memory exhaustion. By abusing this vulnerability, an attacker is able to crash any FreeSWITCH instance by flooding it with SIP messages, leading to Denial of Service. The attack does not require authentication and can be carried out over UDP, TCP or TLS. This issue was patched in version 1.10.7.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.60%

72.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Freeswitch	Freeswitch	< 1.10.7

References

https://github.com/signalwire/freeswitch/releases/tag/v1.10.7Release Notes, Third Party Advisory
https://github.com/signalwire/freeswitch/security/advisories/GHSA-jvpq-23v4-gp3mExploit, Third Party Advisory
https://github.com/signalwire/freeswitch/releases/tag/v1.10.7Release Notes, Third Party Advisory
https://github.com/signalwire/freeswitch/security/advisories/GHSA-jvpq-23v4-gp3mExploit, Third Party Advisory

Timeline

Published: Oct 25, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-41145?

How severe is CVE-2021-41145?

CVE-2021-41145 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.60% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41145?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-41145?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST