CVE-2019-16018: Cisco IOS XR Software EVPN Operational Routes Denial of Service Vulnerability
First published: Sun Jan 26 2020(Updated: )
A vulnerability 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 vulnerability is due to incorrect processing of a BGP update message that contains crafted EVPN attributes. An attacker could indirectly exploit the vulnerability by sending BGP EVPN update messages with a specific, malformed attribute to an affected system and waiting for a user on the device to display the EVPN operational routes’ status. If successful, the attacker could 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 this vulnerability, 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.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XRv 9000 | =6.6.1 | |
| Cisco ASR 9000v-v2 | ||
| Cisco ASR 9001 | ||
| Cisco ASR 9006 Router | ||
| Cisco ASR 9010 Router | ||
| Cisco ASR 9901-RP Firmware | ||
| Cisco ASR 9904 | ||
| Cisco ASR 9906 | ||
| Cisco ASR 9910 | ||
| Cisco ASR 9912 | ||
| Cisco ASR 9922 | ||
| Cisco NCS 540 Series | ||
| Cisco NCS 5501-SE | ||
| Cisco NCS 5501-SE | ||
| Cisco NCS 5502 | ||
| Cisco NCS 5502-SE Firmware | ||
| Cisco NCS 5508 | ||
| Cisco NCS 5516 | ||
| Cisco NCS 6000 | ||
| Cisco IOS XRv 9000 | =6.6.2 | |
| Cisco ASR 9000v-v2 | ||
| Cisco ASR 9001 | ||
| Cisco ASR 9006 Router | ||
| Cisco ASR 9010 Router | ||
| Cisco ASR 9901-RP Firmware | ||
| Cisco ASR 9904 | ||
| Cisco ASR 9906 | ||
| Cisco ASR 9910 | ||
| Cisco ASR 9912 | ||
| Cisco ASR 9922 | ||
| Cisco CRS | ||
| Cisco IOS XRv 9000 | ||
| Cisco IOS XRv 9000 | =6.6.25 | |
| Cisco NCS 540 | ||
| Cisco NCS 560-4 | ||
| Cisco IOS XRv 9000 | =7.0.1 | |
| Cisco NCS 1001 | ||
| Cisco NCS 1002 | ||
| Cisco NCS 1004 Firmware | ||
| Cisco NCS 5001 Firmware | ||
| Cisco NCS 5002 |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID of this Cisco IOS XR Software vulnerability?
The vulnerability ID for this Cisco IOS XR Software vulnerability is CVE-2019-16018.
What is the severity level of CVE-2019-16018?
The severity level of CVE-2019-16018 is high with a score of 6.5.
What is the affected software for CVE-2019-16018?
The affected software for CVE-2019-16018 is Cisco IOS XR Software 6.6.1 to 6.6.25.
What is the impact of CVE-2019-16018?
CVE-2019-16018 allows an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
How can I fix CVE-2019-16018?
To fix CVE-2019-16018, it is recommended to upgrade to a fixed version of Cisco IOS XR Software.
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- source/MITRE
- agent/last-modified-date
- agent/source
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- agent/softwarecombine
- vendor/cisco
- canonical/cisco ios xrv 9000
- version/cisco ios xrv 9000/6.6.1
- canonical/cisco asr 9000v-v2
- canonical/cisco asr 9001
- canonical/cisco asr 9006 router
- canonical/cisco asr 9010 router
- canonical/cisco asr 9901-rp firmware
- canonical/cisco asr 9904
- canonical/cisco asr 9906
- canonical/cisco asr 9910
- canonical/cisco asr 9912
- canonical/cisco asr 9922
- canonical/cisco ncs 540 series
- canonical/cisco ncs 5501-se
- canonical/cisco ncs 5502
- canonical/cisco ncs 5502-se firmware
- canonical/cisco ncs 5508
- canonical/cisco ncs 5516
- canonical/cisco ncs 6000
- version/cisco ios xrv 9000/6.6.2
- canonical/cisco crs
- version/cisco ios xrv 9000/6.6.25
- canonical/cisco ncs 540
- canonical/cisco ncs 560-4
- version/cisco ios xrv 9000/7.0.1
- canonical/cisco ncs 1001
- canonical/cisco ncs 1002
- canonical/cisco ncs 1004 firmware
- canonical/cisco ncs 5001 firmware
- canonical/cisco ncs 5002