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CVE-2026-49475

FreeSWITCH: Out-of-bounds memory access in core STUN attribute parsing

Published: Jun 9, 2026Updated: Jul 23, 2026 Sources: CVE List NVDCWE-20
7.5HIGH
NVD MITRE
EPSS Score
0.3%
Top 80.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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 1.11.0, a STUN packet whose declared attribute length is shorter than the structure the parser casts to causes the parser to read and write past the end of the attribute, producing an out-of-bounds memory access on the per-leg media buffer. This issue has been patched in version 1.11.0.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-20CWE-125CWE-787

Affected Products

signalwire
commercialaka sofia-sip (related), freeswitch (related)
freeswitchMixed
Communications / voip-telephony
freeswitch
oss-project
freeswitchOn-prem
Communications / voip-telephony

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

3 techniques
Collection
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/signalwire/freeswitch/security/advisories/GHSA-9j6h-hc95-q926
github.com
https://github.com/signalwire/freeswitch/releases/tag/v1.11.0
github.com

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