CVE-2019-19217

Current Description

A vulnerability in the implementation of Border Gateway Protocol (BGP) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected system. The vulnerability is due to incorrect processing of certain BGP update messages. An attacker could exploit this vulnerability by sending BGP update messages that include a specific set of attributes to be processed by an affected system. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic from explicitly defined peers only. 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.

Basic Data

PublishedJuly 06, 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:N/AC:M/Au:N/C:N/I:N/A:P
CVSS 2 - Access VectorNETWORK
CVSS 2 - Access ComplexityMEDIUM
CVSS 2 - AuthenticationNONE
CVSS 2 - Confidentiality ImpactNONE
CVSS 2 - Availability ImpactPARTIAL
CVSS 2 - Base Score4.3
SeverityMEDIUM
Exploitability Score8.6
Impact Score2.9
Obtain All Privilegefalse
Obtain User Privilegefalse
Obtain Other Privilegefalse

Base Metric V3

CVSS 3 - Version3.0
CVSS 3 - Vector StringCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3 - Attack VectorNETWORK
CVSS 3 - Attack ComplexityHIGH
CVSS 3 - Privileges RequiredNONE
CVSS 3 - User InteractionNONE
CVSS 3 - ScopeUNCHANGED
CVSS 3 - Confidentiality ImpactNONE
CVSS 3 - Integrity ImpactNONE
CVSS 3 - Availability ImpactHIGH
CVSS 3 - Base Score5.9
CVSS 3 - Base SeverityMEDIUM
Exploitability Score2.2
Base SeverityMEDIUM

Configurations

  • AND
    • OR - Configuration 1
      Cpe VersionPartVendorProductVersionUpdateEditionLanguageSW EditionTarget SWTarget HWOtherVersion Start IncludingVersion End IncludingVersion Start ExcludingVersion End Excluding
      2.3OSCiscoIos Xr********4.3.16.6.2
    • OR Running on/with:
      Cpe VersionPartVendorProductVersionUpdateEditionLanguageSW EditionTarget SWTarget HWOtherVersion Start IncludingVersion End IncludingVersion Start ExcludingVersion End Excluding
      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 9920-*******

Vulnerable Software List

VendorProductVersions
Cisco Ios Xr *

References

NameSourceURLTags
20190703 Cisco IOS XR Software Border Gateway Protocol Denial of Service Vulnerabilityhttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-iosxr-bgp-doCISCOVendor Advisory