Vulnerability Name:

CVE-2021-1586 (CCN-208199)

Assigned:2020-11-13
Published:2021-08-25
Updated:2021-09-02
Summary:A vulnerability in the Multi-Pod or Multi-Site network configurations for Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, remote attacker to unexpectedly restart the device, resulting in a denial of service (DoS) condition. This vulnerability exists because TCP traffic sent to a specific port on an affected device is not properly sanitized. An attacker could exploit this vulnerability by sending crafted TCP data to a specific port that is listening on a public-facing IP address for the Multi-Pod or Multi-Site configuration. A successful exploit could allow the attacker to cause the device to restart unexpectedly, resulting in a DoS condition.
CVSS v3 Severity:8.6 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
7.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
8.6 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
7.5 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-345
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-1586

Source: XF
Type: UNKNOWN
cisco-cve20211586-dos(208199)

Source: CCN
Type: Cisco Security Advisory cisco-sa-n9kaci-tcp-dos-YXukt6gM
Cisco Nexus 9000 Series Fabric Switches ACI Mode Multi-Pod and Multi-Site TCP Denial of Service Vulnerability

Source: CISCO
Type: Patch, Vendor Advisory
20210825 Cisco Nexus 9000 Series Fabric Switches ACI Mode Multi-Pod and Multi-Site TCP Denial of Service Vulnerability

Vulnerable Configuration:Configuration 1:
  • cpe:/o:cisco:nx-os:15.0(2e):*:*:*:*:*:*:*
  • OR cpe:/o:cisco:nx-os:15.1(1h):*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:nexus_9000v:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_92160yc-x:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_92300yc:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_92304qc:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_92348gc-x:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_9236c:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_9272q:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_93108tc-ex:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_93108tc-ex-24:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_93108tc-fx:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_93108tc-fx-24:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_93108tc-fx3p:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_93120tx:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_93128tx:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_9316d-gx:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_93180lc-ex:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_93180yc-ex:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_93180yc-ex-24:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_93180yc-fx:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_93180yc-fx-24:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_93180yc-fx3:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_93180yc-fx3s:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_93216tc-fx2:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_93240yc-fx2:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_9332c:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_9332pq:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_93360yc-fx2:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_9336c-fx2:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_9336c-fx2-e:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_9348gc-fxp:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_93600cd-gx:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_9364c:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_9364c-gx:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_9372px:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_9372px-e:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_9372tx:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_9372tx-e:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_9396px:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_9396tx:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:nexus_9508:-:*:*:*:*:*:*:*

  • * Denotes that component is vulnerable
    BACK
    cisco nx-os 15.0(2e)
    cisco nx-os 15.1(1h)
    cisco nexus 9000v -
    cisco nexus 92160yc-x -
    cisco nexus 92300yc -
    cisco nexus 92304qc -
    cisco nexus 92348gc-x -
    cisco nexus 9236c -
    cisco nexus 9272q -
    cisco nexus 93108tc-ex -
    cisco nexus 93108tc-ex-24 -
    cisco nexus 93108tc-fx -
    cisco nexus 93108tc-fx-24 -
    cisco nexus 93108tc-fx3p -
    cisco nexus 93120tx -
    cisco nexus 93128tx -
    cisco nexus 9316d-gx -
    cisco nexus 93180lc-ex -
    cisco nexus 93180yc-ex -
    cisco nexus 93180yc-ex-24 -
    cisco nexus 93180yc-fx -
    cisco nexus 93180yc-fx-24 -
    cisco nexus 93180yc-fx3 -
    cisco nexus 93180yc-fx3s -
    cisco nexus 93216tc-fx2 -
    cisco nexus 93240yc-fx2 -
    cisco nexus 9332c -
    cisco nexus 9332pq -
    cisco nexus 93360yc-fx2 -
    cisco nexus 9336c-fx2 -
    cisco nexus 9336c-fx2-e -
    cisco nexus 9348gc-fxp -
    cisco nexus 93600cd-gx -
    cisco nexus 9364c -
    cisco nexus 9364c-gx -
    cisco nexus 9372px -
    cisco nexus 9372px-e -
    cisco nexus 9372tx -
    cisco nexus 9372tx-e -
    cisco nexus 9396px -
    cisco nexus 9396tx -
    cisco nexus 9508 -