CVE-2026-49843 (GCVE-0-2026-49843)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:04 – Updated: 2026-06-10 13:47
VLAI
EPSS
VEX
Title
FreeSWITCH: Pre-authentication session eviction via attacker-chosen `sessid` in `mod_verto`
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 1.11.1, mod_verto's JSON-RPC handler bound the connection to the client-supplied sessid on the first frame, before the authentication gate. Binding inserts the connection into the global session hash and, on a key collision, drops the prior occupant of that slot — sending it a verto.punt, detaching its calls, and closing its socket. An unauthenticated network attacker who knows a target session UUID could therefore evict the legitimate client. This issue has been patched in version 1.11.1.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-287 - Improper Authentication
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/signalwire/freeswitch/security… | x_refsource_CONFIRM |
| https://github.com/signalwire/freeswitch/releases… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| signalwire | freeswitch |
Affected:
< 1.11.1
|
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-49843",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-06-10T13:46:43.345537Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-06-10T13:47:02.332Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "freeswitch",
"vendor": "signalwire",
"versions": [
{
"status": "affected",
"version": "\u003c 1.11.1"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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 1.11.1, mod_verto\u0027s JSON-RPC handler bound the connection to the client-supplied sessid on the first frame, before the authentication gate. Binding inserts the connection into the global session hash and, on a key collision, drops the prior occupant of that slot \u2014 sending it a verto.punt, detaching its calls, and closing its socket. An unauthenticated network attacker who knows a target session UUID could therefore evict the legitimate client. This issue has been patched in version 1.11.1."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-287",
"description": "CWE-287: Improper Authentication",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-06-09T16:04:55.308Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/signalwire/freeswitch/security/advisories/GHSA-9457-fxr9-x78m",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/signalwire/freeswitch/security/advisories/GHSA-9457-fxr9-x78m"
},
{
"name": "https://github.com/signalwire/freeswitch/releases/tag/v1.11.1",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/signalwire/freeswitch/releases/tag/v1.11.1"
}
],
"source": {
"advisory": "GHSA-9457-fxr9-x78m",
"discovery": "UNKNOWN"
},
"title": "FreeSWITCH: Pre-authentication session eviction via attacker-chosen `sessid` in `mod_verto`"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-49843",
"datePublished": "2026-06-09T16:04:55.308Z",
"dateReserved": "2026-06-01T18:50:36.057Z",
"dateUpdated": "2026-06-10T13:47:02.332Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-49843",
"date": "2026-07-24",
"epss": "0.00284",
"percentile": "0.20569"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-49843\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-06-09T17:17:48.170\",\"lastModified\":\"2026-07-23T08:10:00.137\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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 1.11.1, mod_verto\u0027s JSON-RPC handler bound the connection to the client-supplied sessid on the first frame, before the authentication gate. Binding inserts the connection into the global session hash and, on a key collision, drops the prior occupant of that slot \u2014 sending it a verto.punt, detaching its calls, and closing its socket. An unauthenticated network attacker who knows a target session UUID could therefore evict the legitimate client. This issue has been patched in version 1.11.1.\"},{\"lang\":\"es\",\"value\":\"FreeSWITCH es una Pila de Telecomunicaciones Definida por Software que permite la transformaci\u00f3n digital de conmutadores de telecomunicaciones propietarios a una implementaci\u00f3n de software que se ejecuta en cualquier hardware comercial. Antes de la versi\u00f3n 1.11.1, el gestor JSON-RPC de mod_verto vinculaba la conexi\u00f3n al sessid proporcionado por el cliente en el primer fotograma, antes de la puerta de autenticaci\u00f3n. La vinculaci\u00f3n inserta la conexi\u00f3n en la tabla hash global de sesiones y, en caso de colisi\u00f3n de clave, elimina al ocupante anterior de esa ranura - envi\u00e1ndole un verto.punt, desvinculando sus llamadas y cerrando su socket. Un atacante de red no autenticado que conoce un UUID de sesi\u00f3n objetivo podr\u00eda, por lo tanto, expulsar al cliente leg\u00edtimo. Este problema ha sido parcheado en la versi\u00f3n 1.11.1.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"signalwire\",\"product\":\"freeswitch\",\"versions\":[{\"version\":\"\u003c 1.11.1\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L\",\"baseScore\":5.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":3.9,\"impactScore\":1.4}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-06-10T13:46:43.345537Z\",\"id\":\"CVE-2026-49843\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"yes\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-287\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:freeswitch:freeswitch:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"1.11.1\",\"matchCriteriaId\":\"E8AED0D0-D5A1-4AA1-9CAE-13830B74CAC5\"}]}]}],\"references\":[{\"url\":\"https://github.com/signalwire/freeswitch/releases/tag/v1.11.1\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Release Notes\"]},{\"url\":\"https://github.com/signalwire/freeswitch/security/advisories/GHSA-9457-fxr9-x78m\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Third Party Advisory\"]}]}}",
"redhat_vex": {
"current_release_date": "2026-06-10T21:03:55+00:00",
"cve": "CVE-2026-49843",
"id": "CVE-2026-49843",
"initial_release_date": "2026-01-01T00:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "FreeSWITCH: Pre-authentication session eviction via attacker-chosen `sessid` in `mod_verto`",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-49843.json",
"version": "3"
},
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-49843\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-10T13:46:43.345537Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-10T13:46:58.801Z\"}}], \"cna\": {\"title\": \"FreeSWITCH: Pre-authentication session eviction via attacker-chosen `sessid` in `mod_verto`\", \"source\": {\"advisory\": \"GHSA-9457-fxr9-x78m\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.3, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"LOW\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"signalwire\", \"product\": \"freeswitch\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 1.11.1\"}]}], \"references\": [{\"url\": \"https://github.com/signalwire/freeswitch/security/advisories/GHSA-9457-fxr9-x78m\", \"name\": \"https://github.com/signalwire/freeswitch/security/advisories/GHSA-9457-fxr9-x78m\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/signalwire/freeswitch/releases/tag/v1.11.1\", \"name\": \"https://github.com/signalwire/freeswitch/releases/tag/v1.11.1\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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 1.11.1, mod_verto\u0027s JSON-RPC handler bound the connection to the client-supplied sessid on the first frame, before the authentication gate. Binding inserts the connection into the global session hash and, on a key collision, drops the prior occupant of that slot \\u2014 sending it a verto.punt, detaching its calls, and closing its socket. An unauthenticated network attacker who knows a target session UUID could therefore evict the legitimate client. This issue has been patched in version 1.11.1.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-287\", \"description\": \"CWE-287: Improper Authentication\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-06-09T16:04:55.308Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-49843\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-10T13:47:02.332Z\", \"dateReserved\": \"2026-06-01T18:50:36.057Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-06-09T16:04:55.308Z\", \"assignerShortName\": \"GitHub_M\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
Loading…
Loading…