FKIE_CVE-2019-1736

Vulnerability from fkie_nvd - Published: 2020-09-23 01:15 - Updated: 2026-06-17 02:29
Severity
6.6 (Medium) - CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
A vulnerability in the firmware of the Cisco UCS C-Series Rack Servers could allow an authenticated, physical attacker to bypass Unified Extensible Firmware Interface (UEFI) Secure Boot validation checks and load a compromised software image on an affected device. The vulnerability is due to improper validation of the server firmware upgrade images. An attacker could exploit this vulnerability by installing a server firmware version that would allow the attacker to disable UEFI Secure Boot. A successful exploit could allow the attacker to bypass the signature validation checks that are done by UEFI Secure Boot technology and load a compromised software image on the affected device. A compromised software image is any software image that has not been digitally signed by Cisco.
References
psirt@cisco.comhttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200219-ucs-boot-bypassPatch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200219-ucs-boot-bypassPatch, Vendor Advisory
Impacted products
Vendor Product Version
cisco fmc1000-k9_bios *
cisco fmc1000-k9_firmware *
cisco fmc2500-k9_bios *
cisco fmc2500-k9_firmware *
cisco fmc4500-k9_bios *
cisco fmc4500-k9_firmware *
cisco sns-3515-k9_bios *
cisco sns-3515-k9_firmware *
cisco sns-3595-k9_bios *
cisco sns-3595-k9_firmware *
cisco sns-3615-k9_bios *
cisco sns-3615-k9_firmware *
cisco sns-3655-k9_bios *
cisco sns-3655-k9_firmware *
cisco sns-3695-k9_bios *
cisco sns-3695-k9_firmware *
cisco tg5004-k9_bios *
cisco tg5004-k9_firmware *
cisco tg5004-k9-rf_bios *
cisco tg5004-k9-rf_firmware *
cisco identity_services_engine 2.4\(0.357\)
cisco identity_services_engine 2.6\(0.156\)
cisco unified_computing_system 3.2\(3h\)c
To clipboard 

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  "cveTags": [],
  "descriptions": [
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      "lang": "en",
      "value": "A vulnerability in the firmware of the Cisco UCS C-Series Rack Servers could allow an authenticated, physical attacker to bypass Unified Extensible Firmware Interface (UEFI) Secure Boot validation checks and load a compromised software image on an affected device. The vulnerability is due to improper validation of the server firmware upgrade images. An attacker could exploit this vulnerability by installing a server firmware version that would allow the attacker to disable UEFI Secure Boot. A successful exploit could allow the attacker to bypass the signature validation checks that are done by UEFI Secure Boot technology and load a compromised software image on the affected device. A compromised software image is any software image that has not been digitally signed by Cisco."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en el firmware de Cisco UCS C-Series Rack Servers, podr\u00eda permitir a un atacante f\u00edsico autenticado omitir las comprobaciones de validaci\u00f3n de Unified Extensible Firmware Interface (UEFI) Secure Boot y cargar una imagen de software comprometida en un dispositivo afectado.\u0026#xa0;La vulnerabilidad es debido a una comprobaci\u00f3n inapropiada de las im\u00e1genes de actualizaci\u00f3n del firmware del servidor.\u0026#xa0;Un atacante podr\u00eda explotar esta vulnerabilidad mediante la instalaci\u00f3n una versi\u00f3n de firmware del servidor que le permitir\u00eda deshabilitar el UEFI Secure Boot.\u0026#xa0;Una explotaci\u00f3n con \u00e9xito podr\u00eda permitir al atacante omitir las comprobaciones de validaci\u00f3n de firmas que realiza la tecnolog\u00eda UEFI Secure Boot y cargar una imagen de software comprometida en el dispositivo afectado.\u0026#xa0;Una imagen de software comprometida es cualquier imagen de software que no haya sido firmada digitalmente por Cisco"
    }
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  "id": "CVE-2019-1736",
  "lastModified": "2026-06-17T02:29:09.757",
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        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "LOCAL",
          "authentication": "NONE",
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          "baseScore": 6.9,
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              "exploitation": "none"
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            {
              "automatable": "no"
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            {
              "technicalImpact": "total"
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          "role": "CISA Coordinator",
          "timestamp": "2024-11-13T17:18:03.065097Z",
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  "published": "2020-09-23T01:15:14.300",
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  "vulnStatus": "Modified",
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}



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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

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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.
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  • 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.


Detection rules are retrieved from Rulezet.


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