CVE-2025-6216
Allegra calculateTokenExpDate Password Recovery Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Allegra. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the password recovery mechanism. The issue results from reliance upon a predictable value when generating a password reset token. An attacker can leverage this vulnerability to bypass authentication on the application. Was ZDI-CAN-27104.
CVSS
- Versión: 3.0
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 9.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 48%
- Percentil entre todas las CVEs puntuadas: 99
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1190Exploit Public-Facing Applicationinitial access95 % - Impacto principal
T1078Valid Accountsstealth · persistence · privilege escalation · initial access90 %
Vector CVSS AV:N/AC:L/PR:N/UI:N indica acceso remoto sin autenticación: T1190. CWE-640 (predictable token) permite generar tokens de reset válidos, permitiendo acceso a cuentas ajenas (T1078) y potencialmente crearlas (T1098).
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- CWE-640
Referencias
JSON original (NVD)
Mostrar
{
"id": "CVE-2025-6216",
"cveTags": [],
"metrics": {
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2025-6216",
"role": "CISA Coordinator",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "total"
}
],
"version": "2.0.3",
"timestamp": "2025-06-23T16:13:58.526075Z"
}
}
],
"cvssMetricV30": [
{
"type": "Secondary",
"source": "zdi-disclosures@trendmicro.com",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.0",
"baseScore": 9.8,
"attackVector": "NETWORK",
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 3.9
}
]
},
"affected": [
{
"source": "zdi-disclosures@trendmicro.com",
"affectedData": [
{
"vendor": "Allegra",
"product": "Allegra",
"versions": [
{
"status": "affected",
"version": "8.1.3.32"
}
],
"defaultStatus": "unknown"
}
]
}
],
"published": "2025-06-21T01:15:28.860",
"references": [
{
"url": "https://alltena.com/en/resources/release-notes/release-notes-for-release-8-1-4-and-release-7-5-2",
"tags": [
"Vendor Advisory"
],
"source": "zdi-disclosures@trendmicro.com"
},
{
"url": "https://www.zerodayinitiative.com/advisories/ZDI-25-410/",
"tags": [
"Third Party Advisory"
],
"source": "zdi-disclosures@trendmicro.com"
}
],
"vulnStatus": "Analyzed",
"weaknesses": [
{
"type": "Secondary",
"source": "zdi-disclosures@trendmicro.com",
"description": [
{
"lang": "en",
"value": "CWE-640"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Allegra calculateTokenExpDate Password Recovery Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Allegra. Authentication is not required to exploit this vulnerability.\n\nThe specific flaw exists within the password recovery mechanism. The issue results from reliance upon a predictable value when generating a password reset token. An attacker can leverage this vulnerability to bypass authentication on the application. Was ZDI-CAN-27104."
},
{
"lang": "es",
"value": "Vulnerabilidad de omisión de autenticación en la recuperación de contraseña de Allegra calculateTokenExpDate. Esta vulnerabilidad permite a atacantes remotos omitir la autenticación en las instalaciones afectadas de Allegra. No se requiere autenticación para explotar esta vulnerabilidad. La falla específica se encuentra en el mecanismo de recuperación de contraseña. El problema se debe a la dependencia de un valor predecible al generar un token de restablecimiento de contraseña. Un atacante puede aprovechar esta vulnerabilidad para omitir la autenticación en la aplicación. Era ZDI-CAN-27104."
}
],
"lastModified": "2026-06-17T10:01:24.160",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:alltena:allegra:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "6B12F18F-4E0B-426B-BBCA-89EC88A86102",
"versionEndExcluding": "7.5.2.70",
"versionStartIncluding": "7.0.0"
},
{
"criteria": "cpe:2.3:a:alltena:allegra:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "2C4D4F4C-4931-4FA9-B10F-6827F96B999E",
"versionEndExcluding": "8.1.24",
"versionStartIncluding": "8.0.0"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "zdi-disclosures@trendmicro.com"
}