Apache Log4j does not verify the TLS hostname in its Socket Appender
The Socket Appender in Apache Log4j Core versions 2.0-beta9 through 2.25.2 does not perform TLS hostname verification of the peer certificate, even when the verifyHostName configuration attribute or the log4j2.sslVerifyHostName system property is set to true.
This issue may allow a man-in-the-middle attacker to intercept or redirect log traffic under the following conditions:
- The attacker is able to intercept or redirect network traffic between the client and the log receiver.
- The attacker can present a server certificate issued by a certification authority trusted by the Socket Appender’s configured trust store (or by the default Java trust store if no custom trust store is configured).
Users are advised to upgrade to Apache Log4j Core version 2.25.3, which addresses this issue.
As an alternative mitigation, the Socket Appender may be configured to use a private or restricted trust root to limit the set of trusted certificates.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Java / Kotlin (Maven) | org.apache.logging.log4j:log4j-core | >= 2.0-beta9, < 2.25.3 | 2.25.3 |
Referencias
- https://nvd.nist.gov/vuln/detail/CVE-2025-68161
- https://github.com/apache/logging-log4j2/pull/4002
- https://github.com/apache/logging-log4j2/commit/3b93748497e1adbbd027fda8a5e7268ec5d0d578
- https://github.com/apache/logging-log4j2
- https://lists.apache.org/thread/xr33kyxq3sl67lwb61ggvm1fzc8k7dvx
- https://logging.apache.org/cyclonedx/vdr.xml
- https://logging.apache.org/log4j/2.x/manual/appenders/network.html#SslConfiguration-attr-verifyHostName
- https://logging.apache.org/log4j/2.x/manual/systemproperties.html#log4j2.sslVerifyHostName
- https://logging.apache.org/security.html#CVE-2025-68161
- http://www.openwall.com/lists/oss-security/2025/12/18/1
- Vector CVSS
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:L/SA:N- Debilidad (CWE)
CWE-297- Plataforma
- Java / Kotlin (Maven)
- Paquete
org.apache.logging.log4j:log4j-core- Publicada
- 18.12.2025
- Actualizado
- 11.10.2026 13:20
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-vc5p-v9hr-52mj - CC BY 4.0
Historial de vulnerabilidades: org.apache.logging.log4j:log4j-core
Todas las vulnerabilidades publicadas de este paquete (Java / Kotlin (Maven)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 11
- Primera → última
- 01.2020 04.2026
- Sin corrección
- 0
- Explotada en ataques
- 2
Distribución por gravedad
- Crítica 3
- Alta 2
- Media 5
- Baja 1
Divulgaciones por año
- 2020: 2
- 2021: 3
- 2022: 1
- 2023: 1
- 2024: 0
- 2025: 1
- 2026: 3
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Apache Log4j does not verify the TLS hostname in its Socket Appender esta entrada
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