Vulnerability Details CVE-2018-0136
A vulnerability in the IPv6 subsystem of Cisco IOS XR Software Release 5.3.4 for the Cisco Aggregation Services Router (ASR) 9000 Series could allow an unauthenticated, remote attacker to trigger a reload of one or more Trident-based line cards, resulting in a denial of service (DoS) condition. The vulnerability is due to incorrect handling of IPv6 packets with a fragment header extension. An attacker could exploit this vulnerability by sending IPv6 packets designed to trigger the issue either to or through the Trident-based line card. A successful exploit could allow the attacker to trigger a reload of Trident-based line cards, resulting in a DoS during the period of time the line card takes to restart. This vulnerability affects Cisco Aggregation Services Router (ASR) 9000 Series when the following conditions are met: The router is running Cisco IOS XR Software Release 5.3.4, and the router has installed Trident-based line cards that have IPv6 configured. A software maintenance upgrade (SMU) has been made available that addresses this vulnerability. The fix has also been incorporated into service pack 7 for Cisco IOS XR Software Release 5.3.4. Cisco Bug IDs: CSCvg46800.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.014
EPSS Ranking 79.3%
CVSS Severity
CVSS v3 Score 8.6
CVSS v2 Score 7.8
References
- http://www.securityfocus.com/bid/102905
- http://www.securitytracker.com/id/1040315
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180131-ipv6
- http://www.securityfocus.com/bid/102905
- http://www.securitytracker.com/id/1040315
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180131-ipv6
Products affected by CVE-2018-0136
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cpe:2.3:h:cisco:asr_9001:-
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cpe:2.3:h:cisco:asr_9006:-
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cpe:2.3:h:cisco:asr_9010:-
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cpe:2.3:h:cisco:asr_9904:-
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cpe:2.3:h:cisco:asr_9906:-
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cpe:2.3:h:cisco:asr_9910:-
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cpe:2.3:h:cisco:asr_9912:-
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cpe:2.3:h:cisco:asr_9922:-
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cpe:2.3:o:cisco:ios_xr:5.3.4