CVE-2026-49843: CWE-287: Improper Authentication in signalwire freeswitch
FreeSWITCH versions prior to 1. 11. 1 contain an improper authentication vulnerability in the mod_verto JSON-RPC handler. The handler binds connections to client-supplied session IDs before authentication, allowing an unauthenticated attacker who knows a target session UUID to evict legitimate clients by causing session collisions. This results in denial of service for the legitimate client. The issue is fixed in version 1. 11. 1.
AI Analysis
Technical Summary
CVE-2026-49843 is an improper authentication vulnerability (CWE-287) in FreeSWITCH's mod_verto JSON-RPC handler. Before version 1.11.1, the handler binds the connection to the client-supplied session ID on the first frame prior to authentication. This binding inserts the connection into a global session hash, and if a key collision occurs, the previous occupant is disconnected by sending a verto.punt, detaching calls, and closing the socket. An unauthenticated network attacker who knows a target session UUID can exploit this to evict the legitimate client, causing denial of service. The vulnerability is patched in FreeSWITCH 1.11.1.
Potential Impact
An unauthenticated attacker can forcibly disconnect legitimate clients by evicting their sessions if the attacker knows the session UUID. This leads to denial of service against legitimate users but does not impact confidentiality or integrity of data.
Mitigation Recommendations
Upgrade FreeSWITCH to version 1.11.1 or later, where this issue has been patched. No other mitigation guidance is provided. Patch status is confirmed by the vendor advisory stating the fix is in 1.11.1.
CVE-2026-49843: CWE-287: Improper Authentication in signalwire freeswitch
Description
FreeSWITCH versions prior to 1. 11. 1 contain an improper authentication vulnerability in the mod_verto JSON-RPC handler. The handler binds connections to client-supplied session IDs before authentication, allowing an unauthenticated attacker who knows a target session UUID to evict legitimate clients by causing session collisions. This results in denial of service for the legitimate client. The issue is fixed in version 1. 11. 1.
CVSS v3.1
Score 5.3medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-49843 is an improper authentication vulnerability (CWE-287) in FreeSWITCH's mod_verto JSON-RPC handler. Before version 1.11.1, the handler binds the connection to the client-supplied session ID on the first frame prior to authentication. This binding inserts the connection into a global session hash, and if a key collision occurs, the previous occupant is disconnected by sending a verto.punt, detaching calls, and closing the socket. An unauthenticated network attacker who knows a target session UUID can exploit this to evict the legitimate client, causing denial of service. The vulnerability is patched in FreeSWITCH 1.11.1.
Potential Impact
An unauthenticated attacker can forcibly disconnect legitimate clients by evicting their sessions if the attacker knows the session UUID. This leads to denial of service against legitimate users but does not impact confidentiality or integrity of data.
Mitigation Recommendations
Upgrade FreeSWITCH to version 1.11.1 or later, where this issue has been patched. No other mitigation guidance is provided. Patch status is confirmed by the vendor advisory stating the fix is in 1.11.1.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-01T18:50:36.057Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a283e9b8dd33fbd8553f49d
Added to database: 6/9/2026, 4:26:03 PM
Last enriched: 6/9/2026, 4:41:44 PM
Last updated: 6/10/2026, 5:10:24 AM
Views: 5
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