CVE-2019-15989 : A vulnerability in the implementation of the Border Gateway Protocol (BGP) funct

A vulnerability in the implementation of the Border Gateway Protocol (BGP) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to incorrect processing of a BGP update message that contains a specific BGP attribute. An attacker could exploit this vulnerability by sending BGP update messages that include a specific, malformed attribute 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 only from explicitly defined peers. 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.

Published 2020-01-26 05:15:14

Updated 2020-01-29 19:46:44

Source Cisco Systems, Inc.

View at NVD, CVE.org

Vulnerability category: Denial of service

Products affected by CVE-2019-15989

Cisco » Ios Xr » Version: 6.6.1
cpe:2.3:o:cisco:ios_xr:6.6.1:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Asr 9000v » Version: N/A For X64
When used together with: Cisco » Asr 9001 » Version: N/A For X64
When used together with: Cisco » Asr 9006 » Version: N/A For X64
When used together with: Cisco » Asr 9010 » Version: N/A For X64
When used together with: Cisco » Asr 9901 » Version: N/A For X64
When used together with: Cisco » Asr 9904 » Version: N/A For X64
When used together with: Cisco » Asr 9906 » Version: N/A For X64
When used together with: Cisco » Asr 9910 » Version: N/A For X64
When used together with: Cisco » Asr 9912 » Version: N/A For X64
When used together with: Cisco » Asr 9922 » Version: N/A For X64
When used together with: Cisco » Ncs 540 » Version: N/A
When used together with: Cisco » Ncs 5501 » Version: N/A
When used together with: Cisco » Ncs 5501-se » Version: N/A
When used together with: Cisco » Ncs 5502 » Version: N/A
When used together with: Cisco » Ncs 5502-se » Version: N/A
When used together with: Cisco » Ncs 5508 » Version: N/A
When used together with: Cisco » Ncs 5516 » Version: N/A
When used together with: Cisco » Ncs 6000 » Version: N/A
Cisco » Ios Xr » Version: 6.6.2
cpe:2.3:o:cisco:ios_xr:6.6.2:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Asr 9000v » Version: N/A
When used together with: Cisco » Asr 9000v » Version: N/A For X64
When used together with: Cisco » Asr 9001 » Version: N/A
When used together with: Cisco » Asr 9001 » Version: N/A For X64
When used together with: Cisco » Asr 9006 » Version: N/A
When used together with: Cisco » Asr 9006 » Version: N/A For X64
When used together with: Cisco » Asr 9010 » Version: N/A
When used together with: Cisco » Asr 9010 » Version: N/A For X64
When used together with: Cisco » Asr 9901 » Version: N/A
When used together with: Cisco » Asr 9901 » Version: N/A For X64
When used together with: Cisco » Asr 9904 » Version: N/A
When used together with: Cisco » Asr 9904 » Version: N/A For X64
When used together with: Cisco » Asr 9906 » Version: N/A
When used together with: Cisco » Asr 9906 » Version: N/A For X64
When used together with: Cisco » Asr 9910 » Version: N/A
When used together with: Cisco » Asr 9910 » Version: N/A For X64
When used together with: Cisco » Asr 9912 » Version: N/A
When used together with: Cisco » Asr 9912 » Version: N/A For X64
When used together with: Cisco » Asr 9922 » Version: N/A
When used together with: Cisco » Asr 9922 » Version: N/A For X64
When used together with: Cisco » CRS » Version: N/A
When used together with: Cisco » Ncs 5501 » Version: N/A
When used together with: Cisco » Ncs 5501-se » Version: N/A
When used together with: Cisco » Ncs 5502 » Version: N/A
When used together with: Cisco » Ncs 5502-se » Version: N/A
When used together with: Cisco » Ncs 5508 » Version: N/A
When used together with: Cisco » Ncs 5516 » Version: N/A
When used together with: Cisco » Xrv 9000 » Version: N/A
Cisco » Ios Xr » Version: 6.6.25
cpe:2.3:o:cisco:ios_xr:6.6.25:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Ncs 540 » Version: N/A
When used together with: Cisco » Ncs 540l » Version: N/A
When used together with: Cisco » Ncs 5501 » Version: N/A
When used together with: Cisco » Ncs 5501-se » Version: N/A
When used together with: Cisco » Ncs 5502 » Version: N/A
When used together with: Cisco » Ncs 5502-se » Version: N/A
When used together with: Cisco » Ncs 5508 » Version: N/A
When used together with: Cisco » Ncs 5516 » Version: N/A
When used together with: Cisco » Ncs 560 » Version: N/A
When used together with: Cisco » Ncs 6000 » Version: N/A
Cisco » Ios Xr » Version: 7.0.1
cpe:2.3:o:cisco:ios_xr:7.0.1:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Asr 9000v » Version: N/A For X64
When used together with: Cisco » Asr 9001 » Version: N/A For X64
When used together with: Cisco » Asr 9006 » Version: N/A For X64
When used together with: Cisco » Asr 9010 » Version: N/A For X64
When used together with: Cisco » Asr 9901 » Version: N/A For X64
When used together with: Cisco » Asr 9904 » Version: N/A For X64
When used together with: Cisco » Asr 9906 » Version: N/A For X64
When used together with: Cisco » Asr 9910 » Version: N/A For X64
When used together with: Cisco » Asr 9912 » Version: N/A For X64
When used together with: Cisco » Asr 9922 » Version: N/A For X64
When used together with: Cisco » Ncs 1001 » Version: N/A
When used together with: Cisco » Ncs 1002 » Version: N/A
When used together with: Cisco » Ncs 1004 » Version: N/A
When used together with: Cisco » Ncs 5001 » Version: N/A
When used together with: Cisco » Ncs 5002 » Version: N/A
When used together with: Cisco » Ncs 540 » Version: N/A
When used together with: Cisco » Ncs 540l » Version: N/A
When used together with: Cisco » Ncs 5501 » Version: N/A
When used together with: Cisco » Ncs 5501-se » Version: N/A
When used together with: Cisco » Ncs 5502 » Version: N/A
When used together with: Cisco » Ncs 5502-se » Version: N/A
When used together with: Cisco » Ncs 5508 » Version: N/A
When used together with: Cisco » Ncs 5516 » Version: N/A
When used together with: Cisco » Ncs 560 » Version: N/A
When used together with: Cisco » Ncs 6000 » Version: N/A
When used together with: Cisco » Xrv 9000 » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2019-15989

EPSS FAQ

1.45%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 79 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2019-15989

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.0	MEDIUM	AV:N/AC:L/Au:N/C:N/I:N/A:P	10.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
8.6	HIGH	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	3.9	4.0	Cisco Systems, Inc.
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Changed Confidentiality: None Integrity: None Availability: High
8.6	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	3.9	4.0	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Changed Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2019-15989

CWE-754 Improper Check for Unusual or Exceptional Conditions

The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.
Assigned by:
- nvd@nist.gov (Primary)
- ykramarz@cisco.com (Secondary)

References for CVE-2019-15989

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-bgp-dos

Cisco IOS XR Software Border Gateway Protocol Attribute Denial of Service Vulnerability
Vendor Advisory

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Vulnerability Details : CVE-2019-15989

Products affected by CVE-2019-15989

Exploit prediction scoring system (EPSS) score for CVE-2019-15989

CVSS scores for CVE-2019-15989

CWE ids for CVE-2019-15989

References for CVE-2019-15989