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CVE-2023-40019

FreeSWITCH allows authorized users to cause a denial of service attack by sending re-INVITE with SDP containing duplicate codec names

MEDIUM
6.5
CVSS Score
Published: September 15, 2023 at 07:34 PM UTC
Updated: June 17, 2026 at 06:15 AM UTC
2 products affected across 2 vendorsFreeswitchFreeswitch

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.9%
SSVC
PoC

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 1.10.10, FreeSWITCH allows authorized users to cause a denial of service attack by sending re-INVITE with SDP containing duplicate codec names. When a call in FreeSWITCH completes codec negotiation, the `codec_string` channel variable is set with the result of the negotiation. On a subsequent re-negotiation, if an SDP is offered that contains codecs with the same names but with different formats, there may be too many codec matches detected by FreeSWITCH leading to overflows of its internal arrays. By abusing this vulnerability, an attacker is able to corrupt stack of FreeSWITCH leading to an undefined behavior of the system or simply crash it. Version 1.10.10 contains a patch for this issue.

Affected

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

Freeswitch· Freeswitch
95%
v < 1.10.10
Affected range stops below 1.10.10, so it looks safe — our inference, not a vendor statement
Freeswitch· Signalwire
60%
v < 1.10.10
Affected range stops below 1.10.10, 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:

Patch and advisory references

References (2)

x_refsource_MISCRelease Notes
Source: [email protected]
https://github.com/signalwire/freeswitch/releases/tag/v1.10.10
x_refsource_CONFIRMExploitVendor Advisory
Source: [email protected]
https://github.com/signalwire/freeswitch/security/advisories/GHSA-gjj5-79p2-9g3q

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-770

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