Vulnerability Monitor

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CVE-2019-16021

Multiple vulnerabilities in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerabilities are due to incorrect processing of BGP update messages that contain crafted EVPN attributes. An attacker could exploit these vulnerabilities by sending BGP EVPN update messages with malformed attributes to be processed by an affected system. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic only from explicitly defined peers. To exploit these vulnerabilities, the malicious BGP update message would need to come from a configured, valid BGP peer, or would need to be injected by the attacker into the victim's BGP network on an existing, valid TCP connection to a BGP peer.

Published

2020-09-23T01:15:13.940

Last Modified

2024-11-21T04:29:56.580

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

CVSSv2 Vector

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

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

10.0

Impact Score

2.9

Weaknesses
  • Type: Secondary
    CWE-399
  • Type: Primary
    NVD-CWE-noinfo
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Operating System cisco ios_xr 6.6.1 Yes
Hardware cisco asr_9000 - No
Hardware cisco asr_9010 - No
Hardware cisco asr_9904 - No
Hardware cisco asr_9910 - No
Hardware cisco asr_9912 - No
Hardware cisco asr_9922 - No
Hardware cisco ncs_540 - No
Hardware cisco ncs_5500 - No
Hardware cisco ncs_6000 - No
Operating System cisco ios_xr 6.6.2 Yes
Hardware cisco asr_9000 - No
Hardware cisco asr_9000 - No
Hardware cisco asr_9010 - No
Hardware cisco asr_9010 - No
Hardware cisco asr_9904 - No
Hardware cisco asr_9904 - No
Hardware cisco asr_9910 - No
Hardware cisco asr_9910 - No
Hardware cisco asr_9912 - No
Hardware cisco asr_9912 - No
Hardware cisco asr_9922 - No
Hardware cisco asr_9922 - No
Hardware cisco carrier_routing_system - No
Hardware cisco ios_xrv_9000 - No
Hardware cisco ncs_5001 - No
Hardware cisco ncs_5002 - No
Hardware cisco ncs_5011 - No
Hardware cisco ncs_540 - No
Hardware cisco ncs_5500 - No
Hardware cisco ncs_6000 - No
Operating System cisco ios_xr 6.6.25 Yes
Hardware cisco ncs_540 - No
Hardware cisco ncs_540l - No
Hardware cisco ncs_5500 - No
Hardware cisco ncs_560 - No
Operating System cisco ios_xr 7.0.1 Yes
Hardware cisco asr_9000 - No
Hardware cisco asr_9010 - No
Hardware cisco asr_9904 - No
Hardware cisco asr_9910 - No
Hardware cisco asr_9912 - No
Hardware cisco asr_9922 - No
Hardware cisco ios_xrv_9000 - No
Hardware cisco ncs_1001 - No
Hardware cisco ncs_1002 - No
Hardware cisco ncs_1004 - No
Hardware cisco ncs_5001 - No
Hardware cisco ncs_5002 - No
Hardware cisco ncs_5011 - No
Hardware cisco ncs_540 - No
Hardware cisco ncs_540l - No
Hardware cisco ncs_5500 - No
Hardware cisco ncs_560 - No
Hardware cisco ncs_6000 - No
References