CVE-2023-20198
Estado: AnalizadaCrítica (10)⚠ Explotación activa
Cisco is providing an update for the ongoing investigation into observed exploitation of the web UI feature in Cisco IOS XE Software. We are updating the list of fixed releases and adding the Software Checker. Our investigation has determined that the actors exploited two previously unknown issues. The attacker first exploited CVE-2023-20198 to gain initial access and issued a privilege 15 command to create a local user and password combination. This allowed the user to log in with normal user access.
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The attacker then exploited another component of the web UI feature, leveraging the new local user to elevate privilege to root and write the implant to the file system. Cisco has assigned CVE-2023-20273 to this issue. CVE-2023-20198 has been assigned a CVSS Score of 10.0. CVE-2023-20273 has been assigned a CVSS Score of 7.2. Both of these CVEs are being tracked by CSCwh87343.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Puntuación base: 10
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 100%
- Percentil entre todas las CVEs puntuadas: 100
- Fecha de la puntuación: 29/9/2026
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).
CISA KEV — explotada activamente
- Añadida al catálogo: 16/10/2023
- Plazo de remediación: 20/10/2023
- Uso conocido en ransomware: Unknown
🎯 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
T1078.001Default Accountsstealth · persistence · privilege escalation · initial access90 % - Impacto secundario
T1068Exploitation for Privilege Escalationprivilege escalation85 % - Impacto secundario
T1565.001Stored Data Manipulationimpact80 %
Web UI expuesta sin autenticación (AV:N/PR:N) explotada para crear usuario local (T1078.001), escalar a root (T1068) y escribir implante en filesystem (T1565.001). CVSS 10.0 y explotación activa en ransomware confirman severidad crítica.
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 (3)
CWE
- CWE-420
- NVD-CWE-Other
Referencias
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-webui-privesc-j22SaA4z
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-webui-privesc-j22SaA4z
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-20198
JSON original (NVD)
Mostrar
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"published": "2023-10-16T16:15:10.023",
"references": [
{
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-webui-privesc-j22SaA4z",
"tags": [
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"tags": [
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"description": [
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"descriptions": [
{
"lang": "en",
"value": "Cisco is providing an update for the ongoing investigation into observed exploitation of the web UI feature in Cisco IOS XE Software. We are updating the list of fixed releases and adding the Software Checker. Our investigation has determined that the actors exploited two previously unknown issues. The attacker first exploited CVE-2023-20198 to gain initial access and issued a privilege 15 command to create a local user and password combination. This allowed the user to log in with normal user access. The attacker then exploited another component of the web UI feature, leveraging the new local user to elevate privilege to root and write the implant to the file system. Cisco has assigned CVE-2023-20273 to this issue. CVE-2023-20198 has been assigned a CVSS Score of 10.0. CVE-2023-20273 has been assigned a CVSS Score of 7.2. Both of these CVEs are being tracked by CSCwh87343."
},
{
"lang": "es",
"value": "Cisco tiene conocimiento de la explotación activa de una vulnerabilidad previamente desconocida en la función de interfaz de usuario web del software Cisco IOS XE cuando se expone a Internet o a redes que no son de confianza. Esta vulnerabilidad permite a un atacante remoto no autenticado crear una cuenta en un sistema afectado con acceso de nivel de privilegio 15. Luego, el atacante puede usar esa cuenta para hacerse con el control del sistema afectado. Para conocer los pasos para cerrar el vector de ataque de esta vulnerabilidad, consulte la sección Recomendaciones de este aviso. Cisco proporcionará actualizaciones sobre el estado de esta investigación y cuándo estará disponible un parche de software."
}
],
"lastModified": "2026-06-17T05:29:47.117",
"cisaActionDue": "2023-10-20",
"cisaExploitAdd": "2023-10-16",
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"cisaRequiredAction": "Verify that instances of Cisco IOS XE Web UI are in compliance with BOD 23-02 and apply mitigations per vendor instructions. For affected products (Cisco IOS XE Web UI exposed to the internet or to untrusted networks), follow vendor instructions to determine if a system may have been compromised and immediately report positive findings to CISA.",
"cisaVulnerabilityName": "Cisco IOS XE Web UI Privilege Escalation Vulnerability"
}