SignalWire FreeSwitch Code Injection Vulnerability
SignalWire — FreeSwitch
- Added to KEV catalog
- 9 November 2026
- Federal remediation due date
- 12 November 2026
- Weakness classification (CWE)
- CWE-77, CWE-78, CWE-749
AI Breakdown
What it is
SignalWire FreeSwitch versions prior to 1.11.3 contain a critical code injection flaw in how inbound SIP messages are handled. Attackers can send specially crafted messages to execute arbitrary operating-system commands with the privileges of the FreeSwitch daemon. This flaw allows unauthorized peers to disclose sensitive credentials, expose system configurations, and take over call controls.
Why it matters
With a critical CVSS score of 9.8, this flaw gives remote attackers full execution privileges on the host system. Active exploitation has already been observed in the wild, creating an urgent risk even though direct ransomware campaign use is currently unknown. A compromised telecom switch can expose internal communications and provide a pivot point into the broader corporate network.
Recommended action
Upgrade FreeSwitch deployments to version 1.11.3 immediately or apply vendor-provided mitigations following CISA BOD 26-04 guidance and forensics triage requirements. IT teams must evaluate the internet exposure of each asset and discontinue using the software if mitigations are unavailable. Federal agencies and aligned organizations must complete required remediation by November 12, 2026.
AI-generated from CISA and NVD data — treat as a starting point, not a substitute for your own risk assessment.
CISA Description
SignalWire FreeSwitch contains a code injection vulnerability that permits configuration and credential disclosure, arbitrary call control, and command execution.
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Notes
This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/signalwire/freeswitch/security/advisories/GHSA-mg63-h38w-8p9p ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-116779
NVD Technical 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 1.11.3, sofia_presence_handle_sip_i_message() split the To user of an inbound SIP MESSAGE on a plus sign and treated the left side as a chat protocol selector. Selecting the api chat proto reached switch_api_execute(), allowing a peer whose MESSAGE was accepted to run FreeSWITCH API commands, including operating-system command sinks, with the daemon's privileges. Inbound chat is enabled on the stock internal and external profiles, and any authenticated profile account is sufficient; stock directory users without password material can also remove that barrier in affected configurations. The flaw permits configuration and credential disclosure, arbitrary call control, and command execution, and exploitation has been observed in the wild. This issue is fixed in version 1.11.3.
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