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CVE-2021-41145

FreeSWITCH susceptible to Denial of Service via SIP flooding

HIGH
7.5
CVSS Score
Published: October 25, 2021 at 10:05 PM UTC
Updated: June 17, 2026 at 04:07 AM UTC
2 products affected across 2 vendorsFreeswitchFreeswitch

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Severity
HIGH7.5
Exploit prediction
EPSS 2%

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.

Affected

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

Freeswitch· Freeswitch
95%
v < 1.10.7
Affected range stops below 1.10.7, so it looks safe — our inference, not a vendor statement
Freeswitch· Signalwire
60%
v < 1.10.7
Affected range stops below 1.10.7, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

x_refsource_MISCRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/signalwire/freeswitch/releases/tag/v1.10.7
x_refsource_CONFIRMExploitThird Party Advisory
Source: [email protected]
https://github.com/signalwire/freeswitch/security/advisories/GHSA-jvpq-23v4-gp3m

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-400CWE-401

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