Vulnerability Monitor

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CVE-2020-3398

A vulnerability in the Border Gateway Protocol (BGP) Multicast VPN (MVPN) implementation of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a BGP session to repeatedly reset, causing a partial denial of service (DoS) condition due to the BGP session being down. The vulnerability is due to incorrect parsing of a specific type of BGP MVPN update message. An attacker could exploit this vulnerability by sending this BGP MVPN update message to a targeted device. A successful exploit could allow the attacker to cause the BGP peer connections to reset, which could lead to BGP route instability and impact traffic. The incoming BGP MVPN update message is valid but is parsed incorrectly by the NX-OS device, which could send a corrupted BGP update to the configured BGP peer. Note: The Cisco implementation of BGP accepts incoming BGP traffic from only explicitly configured peers. To exploit this vulnerability, an attacker must send a specific BGP MVPN update message over an established TCP connection that appears to come from a trusted BGP peer. To do so, the attacker must obtain information about the BGP peers in the trusted network of the affected system.

Published

2020-08-27T16:15:12.253

Last Modified

2024-11-21T05:30:57.133

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 8.6 (HIGH)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:N/I:N/A:P

  • Access Vector: NETWORK
  • Access Complexity: MEDIUM
  • Authentication: NONE
  • Confidentiality Impact: NONE
  • Integrity Impact: NONE
  • Availability Impact: PARTIAL
Exploitability Score

8.6

Impact Score

2.9

Weaknesses
  • Type: Secondary
    CWE-20
  • Type: Primary
    CWE-20
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Operating System cisco nx-os - Yes
Hardware cisco nexus_3016 - No
Hardware cisco nexus_3048 - No
Hardware cisco nexus_3064 - No
Hardware cisco nexus_3064-t - No
Hardware cisco nexus_31108pc-v - No
Hardware cisco nexus_31108tc-v - No
Hardware cisco nexus_31128pq - No
Hardware cisco nexus_3132c-z - No
Hardware cisco nexus_3132q - No
Hardware cisco nexus_3132q-v - No
Hardware cisco nexus_3132q-xl - No
Hardware cisco nexus_3164q - No
Hardware cisco nexus_3172 - No
Hardware cisco nexus_3172pq-xl - No
Hardware cisco nexus_3172tq - No
Hardware cisco nexus_3172tq-32t - No
Hardware cisco nexus_3172tq-xl - No
Hardware cisco nexus_3232c - No
Hardware cisco nexus_3264c-e - No
Hardware cisco nexus_3264q - No
Hardware cisco nexus_3408-s - No
Hardware cisco nexus_34180yc - No
Hardware cisco nexus_3432d-s - No
Hardware cisco nexus_3464c - No
Hardware cisco nexus_3524 - No
Hardware cisco nexus_3524-x - No
Hardware cisco nexus_3524-xl - No
Hardware cisco nexus_3548 - No
Hardware cisco nexus_3548-x - No
Hardware cisco nexus_3548-xl - No
Hardware cisco nexus_36180yc-r - No
Hardware cisco nexus_3636c-r - No
Hardware cisco nexus_7000 - No
Hardware cisco nexus_7700 - No
Hardware cisco nexus_9000v - No
Hardware cisco nexus_92160yc-x - No
Hardware cisco nexus_92300yc - No
Hardware cisco nexus_92304qc - No
Hardware cisco nexus_92348gc-x - No
Hardware cisco nexus_9236c - No
Hardware cisco nexus_9272q - No
Hardware cisco nexus_93108tc-ex - No
Hardware cisco nexus_93108tc-fx - No
Hardware cisco nexus_93120tx - No
Hardware cisco nexus_93128tx - No
Hardware cisco nexus_93180lc-ex - No
Hardware cisco nexus_93180yc-ex - No
Hardware cisco nexus_93180yc-fx - No
Hardware cisco nexus_93216tc-fx2 - No
Hardware cisco nexus_93240yc-fx2 - No
Hardware cisco nexus_9332c - No
Hardware cisco nexus_9332pq - No
Hardware cisco nexus_93360yc-fx2 - No
Hardware cisco nexus_9336c-fx2 - No
Hardware cisco nexus_9336pq_aci_spine - No
Hardware cisco nexus_9348gc-fxp - No
Hardware cisco nexus_9364c - No
Hardware cisco nexus_9372px - No
Hardware cisco nexus_9372px-e - No
Hardware cisco nexus_9372tx - No
Hardware cisco nexus_9372tx-e - No
Hardware cisco nexus_9396px - No
Hardware cisco nexus_9396tx - No
Hardware cisco nexus_9504 - No
Hardware cisco nexus_9508 - No
Hardware cisco nexus_9516 - No
References