CVE-2019-1846

Current Description

A vulnerability in the Multiprotocol Label Switching (MPLS) Operations, Administration, and Maintenance (OAM) implementation of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, adjacent attacker to trigger a denial of service (DoS) condition on an affected device. The vulnerability is due to the incorrect handling of certain MPLS OAM packets. An attacker could exploit this vulnerability by sending malicious MPLS OAM packets to an affected device. A successful exploit could allow the attacker to cause the lspv_server process to crash. The crash could lead to system instability and the inability to process or forward traffic though the device, resulting in a DoS condition that require manual intervention to restore normal operating conditions.

Basic Data

PublishedMay 16, 2019
Last ModifiedOctober 09, 2019
Assignercve@mitre.org
Data TypeCVE
Data FormatMITRE
Data Version4.0
Problem TypeCWE-20
CVE Data Version4.0

Base Metric V2

CVSS 2 - Version2.0
CVSS 2 - Vector StringAV:A/AC:L/Au:N/C:N/I:N/A:C
CVSS 2 - Access VectorADJACENT_NETWORK
CVSS 2 - Access ComplexityLOW
CVSS 2 - AuthenticationNONE
CVSS 2 - Confidentiality ImpactNONE
CVSS 2 - Availability ImpactCOMPLETE
CVSS 2 - Base Score6.1
SeverityMEDIUM
Exploitability Score6.5
Impact Score6.9
Obtain All Privilegefalse
Obtain User Privilegefalse
Obtain Other Privilegefalse

Base Metric V3

CVSS 3 - Version3.0
CVSS 3 - Vector StringCVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CVSS 3 - Attack VectorADJACENT_NETWORK
CVSS 3 - Attack ComplexityLOW
CVSS 3 - Privileges RequiredNONE
CVSS 3 - User InteractionNONE
CVSS 3 - ScopeCHANGED
CVSS 3 - Confidentiality ImpactNONE
CVSS 3 - Integrity ImpactNONE
CVSS 3 - Availability ImpactHIGH
CVSS 3 - Base Score7.4
CVSS 3 - Base SeverityHIGH
Exploitability Score2.8
Base SeverityHIGH

Configurations

  • AND
    • OR - Configuration 1
      Cpe VersionPartVendorProductVersionUpdateEditionLanguageSW EditionTarget SWTarget HWOtherVersion Start IncludingVersion End IncludingVersion Start ExcludingVersion End Excluding
      2.3OSCiscoIos Xr5.3.3sp10******
    • OR Running on/with:
      Cpe VersionPartVendorProductVersionUpdateEditionLanguageSW EditionTarget SWTarget HWOtherVersion Start IncludingVersion End IncludingVersion Start ExcludingVersion End Excluding
      2.3HardwareCiscoAsr 9000v-*******
      2.3HardwareCiscoAsr 9001-*******
      2.3HardwareCiscoAsr 9006-*******
      2.3HardwareCiscoAsr 9010-*******
      2.3HardwareCiscoAsr 9901-*******
      2.3HardwareCiscoAsr 9904-*******
      2.3HardwareCiscoAsr 9906-*******
      2.3HardwareCiscoAsr 9910-*******
      2.3HardwareCiscoAsr 9912-*******
      2.3HardwareCiscoAsr 9922-*******

Vulnerable Software List

VendorProductVersions
Cisco Ios Xr 5.3.3

References

NameSourceURLTags
108363http://www.securityfocus.com/bid/108363BIDThird Party Advisory VDB Entry
20190515 Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers MPLS OAM Denial of Service Vulnerabilityhttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-asr9k-mpls-dCISCOVendor Advisory