National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2019-1849 Detail

Current Description

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.

Source:  MITRE
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 6.5 MEDIUM
Vector: AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (V3.0 legend)
Impact Score: 3.6
Exploitability Score: 2.8


Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

CVSS v2.0 Severity and Metrics:

Base Score: 6.1 MEDIUM
Vector: (AV:A/AC:L/Au:N/C:N/I:N/A:C) (V2 legend)
Impact Subscore: 6.9
Exploitability Subscore: 6.5


Access Vector (AV): Local_Network
Access Complexity (AC): Low
Authentication (AU): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Complete
Additional Information:
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.securityfocus.com/bid/108342 Third Party Advisory VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-iosxr-evpn-dos Vendor Advisory

Technical Details

Vulnerability Type (View All)

  • Improper Check for Unusual or Exceptional Conditions (CWE-754)

Known Affected Software Configurations Switch to CPE 2.3

Configuration 1 ( hide )
 cpe:/o:cisco:ios_xr
     Show Matching CPE(s)
From (including)
6.1.0
Up to (excluding)
6.3.3
 cpe:/o:cisco:ios_xr
     Show Matching CPE(s)
From (including)
6.4.0
Up to (excluding)
6.4.2
 cpe:/o:cisco:ios_xr
     Show Matching CPE(s)
From (including)
6.5.0
Up to (excluding)
6.5.2
 cpe:/o:cisco:ios_xr
     Show Matching CPE(s)
From (including)
6.6.0
Up to (excluding)
6.6.1


Change History

3 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2019-1849
NVD Published Date:
05/15/2019
NVD Last Modified:
10/09/2019