TI-2023-20909 Aliases CVE-2023-40019

Resource allocation without limits in signalwire freeswitch

HIGH 72CWE-770Published 2023-09-15 · Updated 2024-09-25

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-770.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00909 60th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed freeswitch (signalwire): 1.10.10

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
signalwire	freeswitch	before 1.10.10	1.10.10	Patch available	CNA

freeswitch Vendorsignalwire Affected before 1.10.10 Fixed in 1.10.10 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:freeswitch:freeswitch::::::::	before 1.10.10	Vulnerable	freeswitch

cpe:2.3:a:freeswitch:freeswitch:*:*:*:*:*:*:*:* Versions before 1.10.10 Vulnerable ·freeswitch

Remediation

Fix · CNA freeswitch (signalwire) Fixed in 1.10.10

Timeline

2026-10-02 Threatist record created from CVE-2023-40019

References

Exploit 1

https://github.com/signalwire/freeswitch/security/advisories/GHSA-gjj5-79p2-9g3q

Other 1

https://github.com/signalwire/freeswitch/releases/tag/v1.10.10

TI-2023-08915 heap-over-flow in stun_parse_attribute in sofia-sip CVSS 3.1CRITICAL 9.8
TI-2022-13049 Heap-based Buffer Overflow and Out-of-bounds Write in Sofia-SIP CVSS 3.1CRITICAL 9.8
TI-2023-28097 FreeSWITCH susceptible to Denial of Service via DTLS Hello packets during call initiation CVSS 3.1HIGH 7.5
TI-2023-20908 FreeSWITCH allows remote users to trigger out of bounds write by offering an ICE candidate with unknown component ID CVSS 3.1HIGH 7.5
TI-2023-15601 heap-over-flow and integer-overflow in sofia-sip CVSS 3.1HIGH 7.5
TI-2022-13048 Out-of-bounds Read in Sofia-SIP CVSS 3.1HIGH 7.5

See all 44 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences