CVE-2019-1849 Cisco IOS XR Software BGP MPLS-Based EVPN Denial of Service Vulnerability

2019-05-1500:00:00

CWE-754

cisco

www.cve.org

7.4 High

CVSS3

Attack Vector

ADJACENT

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

0.001 Low

EPSS

Percentile

27.3%

JSON

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.

CNA Affected

[
  {
    "product": "Cisco IOS XR Software ",
    "vendor": "Cisco",
    "versions": [
      {
        "lessThan": "n/a",
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom"
      }
    ]
  }
]