CVE-2020-3397: Input Validation
First published: Thu Aug 27 2020(Updated: )
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 an affected device to unexpectedly reload, resulting in a denial of service (DoS) condition. The vulnerability is due to incomplete input validation of a specific type of BGP MVPN update message. An attacker could exploit this vulnerability by sending this specific, valid BGP MVPN update message to a targeted device. A successful exploit could allow the attacker to cause one of the BGP-related routing applications to restart multiple times, leading to a system-level restart. 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.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Nx-os | ||
| Cisco Nexus 3016 | ||
| Cisco Nexus 3048 | ||
| Cisco Nexus 3064 | ||
| Cisco Nexus 3064-t | ||
| Cisco Nexus 31108pc-v | ||
| Cisco Nexus 31108tc-v | ||
| Cisco Nexus 31128pq | ||
| Cisco Nexus 3132c-z | ||
| Cisco Nexus 3132q | ||
| Cisco Nexus 3132q-v | ||
| Cisco Nexus 3132q-xl | ||
| Cisco Nexus 3164q | ||
| Cisco Nexus 3172 | ||
| Cisco Nexus 3172pq-xl | ||
| Cisco Nexus 3172tq | ||
| Cisco Nexus 3172tq-32t | ||
| Cisco Nexus 3172tq-xl | ||
| Cisco Nexus 3232c | ||
| Cisco Nexus 3264c-e | ||
| Cisco Nexus 3264q | ||
| Cisco Nexus 3408-s | ||
| Cisco Nexus 34180yc | ||
| Cisco Nexus 3432d-s | ||
| Cisco Nexus 3464c | ||
| Cisco Nexus 3524 | ||
| Cisco Nexus 3524-x | ||
| Cisco Nexus 3524-xl | ||
| Cisco Nexus 3548 | ||
| Cisco Nexus 3548-x | ||
| Cisco Nexus 3548-xl | ||
| Cisco Nexus 36180yc-r | ||
| Cisco Nexus 3636c-r | ||
| 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-fx | ||
| Cisco Nexus 93120tx | ||
| Cisco Nexus 93128tx | ||
| Cisco Nexus 93180lc-ex | ||
| Cisco Nexus 93180yc-ex | ||
| Cisco Nexus 93180yc-fx | ||
| Cisco Nexus 93216tc-fx2 | ||
| Cisco Nexus 93240yc-fx2 | ||
| Cisco Nexus 9332c | ||
| Cisco Nexus 9332pq | ||
| Cisco Nexus 93360yc-fx2 | ||
| Cisco Nexus 9336c-fx2 | ||
| Cisco Nexus 9336pq Aci Spine | ||
| Cisco Nexus 9348gc-fxp | ||
| Cisco Nexus 9364c | ||
| Cisco Nexus 9372px | ||
| Cisco Nexus 9372px-e | ||
| Cisco Nexus 9372tx | ||
| Cisco Nexus 9372tx-e | ||
| Cisco Nexus 9396px | ||
| Cisco Nexus 9396tx | ||
| Cisco Nexus 9504 | ||
| Cisco Nexus 9508 | ||
| Cisco Nexus 9516 |
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Reference Links
Frequently Asked Questions
What is CVE-2020-3397?
CVE-2020-3397 is a vulnerability in the Border Gateway Protocol (BGP) Multicast VPN (MVPN) implementation of Cisco NX-OS Software that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
Which devices are affected by CVE-2020-3397?
Cisco Nexus devices running Cisco NX-OS Software are affected by CVE-2020-3397.
How severe is CVE-2020-3397?
CVE-2020-3397 has a severity rating of 8.6 (high).
How can I fix CVE-2020-3397?
To fix CVE-2020-3397, Cisco recommends upgrading to a fixed software release.
Where can I find more information about CVE-2020-3397?
More information about CVE-2020-3397 can be found on the Cisco Security Advisory page.
- collector/nvd-index
- agent/weakness
- vendor/cisco
- canonical/cisco nx-os
- canonical/cisco nexus 3016
- canonical/cisco nexus 3048
- canonical/cisco nexus 3064
- canonical/cisco nexus 3064-t
- canonical/cisco nexus 31108pc-v
- canonical/cisco nexus 31108tc-v
- canonical/cisco nexus 31128pq
- canonical/cisco nexus 3132c-z
- canonical/cisco nexus 3132q
- canonical/cisco nexus 3132q-v
- canonical/cisco nexus 3132q-xl
- canonical/cisco nexus 3164q
- canonical/cisco nexus 3172
- canonical/cisco nexus 3172pq-xl
- canonical/cisco nexus 3172tq
- canonical/cisco nexus 3172tq-32t
- canonical/cisco nexus 3172tq-xl
- canonical/cisco nexus 3232c
- canonical/cisco nexus 3264c-e
- canonical/cisco nexus 3264q
- canonical/cisco nexus 3408-s
- canonical/cisco nexus 34180yc
- canonical/cisco nexus 3432d-s
- canonical/cisco nexus 3464c
- canonical/cisco nexus 3524
- canonical/cisco nexus 3524-x
- canonical/cisco nexus 3524-xl
- canonical/cisco nexus 3548
- canonical/cisco nexus 3548-x
- canonical/cisco nexus 3548-xl
- canonical/cisco nexus 36180yc-r
- canonical/cisco nexus 3636c-r
- canonical/cisco nexus 92160yc-x
- canonical/cisco nexus 92300yc
- canonical/cisco nexus 92304qc
- canonical/cisco nexus 92348gc-x
- canonical/cisco nexus 9236c
- canonical/cisco nexus 9272q
- canonical/cisco nexus 93108tc-ex
- canonical/cisco nexus 93108tc-fx
- canonical/cisco nexus 93120tx
- canonical/cisco nexus 93128tx
- canonical/cisco nexus 93180lc-ex
- canonical/cisco nexus 93180yc-ex
- canonical/cisco nexus 93180yc-fx
- canonical/cisco nexus 93216tc-fx2
- canonical/cisco nexus 93240yc-fx2
- canonical/cisco nexus 9332c
- canonical/cisco nexus 9332pq
- canonical/cisco nexus 93360yc-fx2
- canonical/cisco nexus 9336c-fx2
- canonical/cisco nexus 9336pq aci spine
- canonical/cisco nexus 9348gc-fxp
- canonical/cisco nexus 9364c
- canonical/cisco nexus 9372px
- canonical/cisco nexus 9372px-e
- canonical/cisco nexus 9372tx
- canonical/cisco nexus 9372tx-e
- canonical/cisco nexus 9396px
- canonical/cisco nexus 9396tx
- canonical/cisco nexus 9504
- canonical/cisco nexus 9508
- canonical/cisco nexus 9516