CVE-2019-1849: Cisco IOS XR Software BGP MPLS-Based EVPN Denial of Service Vulnerability
First published: Thu May 16 2019(Updated: )
A vulnerability in the Border Gateway Patrol (BGP) Multiprotocol Label Switching (MPLS)-based Ethernet VPN (EVPN) implementation of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to trigger a denial of service (DoS) condition on an affected device. The vulnerability is due to a logic error that occurs when the affected software processes specific EVPN routing information. An attacker could exploit this vulnerability by injecting malicious traffic patterns into the targeted EVPN network. A successful exploit could result in a crash of the l2vpn_mgr process on Provider Edge (PE) device members of the same EVPN instance (EVI). On each of the affected devices, a crash could lead to system instability and the inability to process or forward traffic through the device, resulting in a DoS condition that would require manual intervention to restore normal operating conditions.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XRv 9000 | >=6.1.0<6.3.3 | |
| Cisco IOS XRv 9000 | >=6.4.0<6.4.2 | |
| Cisco IOS XRv 9000 | >=6.5.0<6.5.2 | |
| Cisco IOS XRv 9000 | >=6.6.0<6.6.1 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2019-1849?
CVE-2019-1849 has a medium severity rating that may lead to denial of service on affected devices.
How do I fix CVE-2019-1849?
To fix CVE-2019-1849, update affected Cisco IOS XR Software to versions 6.3.3, 6.4.2, 6.5.2, or 6.6.1 or later.
Which versions of Cisco IOS XR are affected by CVE-2019-1849?
CVE-2019-1849 affects Cisco IOS XR versions from 6.1.0 to 6.3.3, from 6.4.0 to 6.4.2, from 6.5.0 to 6.5.2, and from 6.6.0 to 6.6.1.
Who can exploit CVE-2019-1849?
CVE-2019-1849 can be exploited by an unauthenticated adjacent attacker.
What type of attack is associated with CVE-2019-1849?
CVE-2019-1849 is associated with a denial of service (DoS) attack.
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