CVE-2026-24281

Estado: ModificadaAlta (7.4)—

Hostname verification in Apache ZooKeeper ZKTrustManager falls back to reverse DNS (PTR) when IP SAN validation fails, allowing attackers who control or spoof PTR records to impersonate ZooKeeper servers or clients with a valid certificate for the PTR name. It's important to note that attacker must present a certificate which is trusted by ZKTrustManager which makes the attack vector harder to exploit. Users are recommended to upgrade to version 3.8.6 or 3.9.5, which fixes this issue by introducing a new configuration option to disable reverse DNS lookup in client and quorum protocols.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Puntuación base: 7.4

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.65%
Percentil entre todas las CVEs puntuadas: 49
Fecha de la puntuación: 5/10/2026

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.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access72 %
Impacto principalT1557 Adversary-in-the-Middlecredential access · collection78 %
Impacto secundarioT1078 Valid Accountsstealth · persistence · privilege escalation · initial access65 %

Vulnerabilidad de verificación SSL/TLS en ZooKeeper que permite suplantación (MITM) mediante DNS invertido; requiere red sin privilegios (AV:N, PR:N) y control de registros PTR. CWE-295 sustenta impersonación de servidores/clientes.

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

User Training Privileged Account Management Network Segmentation Limit Access to Resource Over Network Filter Network Traffic Application Developer Guidance

Tecnologías afectadas (1)

Apache — Zookeeper

CWE

CWE-295, CWE-350
CWE-295
CWE-295

Referencias

JSON original (NVD)

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      "value": "Hostname verification in Apache ZooKeeper ZKTrustManager falls back to reverse DNS (PTR) when IP SAN validation fails, allowing attackers who control or spoof PTR records to impersonate ZooKeeper servers or clients with a valid certificate for the PTR name. It's important to note that attacker must present a certificate which is trusted by ZKTrustManager which makes the attack vector harder to exploit. Users are recommended to upgrade to version 3.8.6 or 3.9.5, which fixes this issue by introducing a new configuration option to disable reverse DNS lookup in client and quorum protocols."
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      "value": "La verificación de nombre de host en Apache ZooKeeper ZKTrustManager recurre a DNS inverso (PTR) cuando falla la validación IP SAN, permitiendo a los atacantes que controlan o falsifican registros PTR suplantar servidores o clientes de ZooKeeper con un certificado válido para el nombre PTR. Es importante señalar que el atacante debe presentar un certificado que sea de confianza para ZKTrustManager, lo que hace que el vector de ataque sea más difícil de explotar. Se recomienda a los usuarios actualizar a la versión 3.8.6 o 3.9.5, que corrige este problema al introducir una nueva opción de configuración para deshabilitar la búsqueda de DNS inverso en los protocolos de cliente y quórum."
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