description: A vulnerability in the Connectivity Fault Management (CFM) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to incorrect processing of invalid continuity check messages (CCMs). An attacker could exploit this vulnerability by sending crafted CCMs to an affected device. A successful exploit could allow the attacker to cause the CFM service to crash when a user displays information about maintenance end points (MEPs) for peer MEPs on an affected device.
problem types: NULL Pointer Dereference
affected:
{
vendor: Cisco
product: Cisco IOS XR Software
versions:
version: 5.2.0, status: affected
version: 5.2.1, status: affected
version: 5.2.2, status: affected
version: 5.2.4, status: affected
version: 5.2.3, status: affected
version: 5.2.5, status: affected
version: 5.3.0, status: affected
version: 5.3.1, status: affected
version: 5.3.2, status: affected
version: 5.3.3, status: affected
version: 5.3.4, status: affected
version: 6.1.1, status: affected
version: 6.1.2, status: affected
version: 6.1.3, status: affected
version: 6.1.4, status: affected
version: 6.2.1, status: affected
version: 6.2.2, status: affected
version: 6.2.3, status: affected
version: 6.2.25, status: affected
version: 6.3.2, status: affected
version: 6.3.3, status: affected
version: 6.3.15, status: affected
version: 6.4.1, status: affected
version: 6.4.2, status: affected
version: 6.4.3, status: affected
version: 6.5.1, status: affected
version: 6.5.2, status: affected
version: 6.6.2, status: affected
version: 6.6.3, status: affected
version: 6.6.25, status: affected
version: 6.6.4, status: affected
version: 7.0.1, status: affected
version: 7.0.2, status: affected
version: 7.1.1, status: affected
version: 7.1.15, status: affected
version: 7.1.2, status: affected
version: 7.1.3, status: affected
version: 6.7.1, status: affected
version: 6.7.2, status: affected
version: 6.7.3, status: affected
version: 6.7.4, status: affected
version: 7.2.1, status: affected
version: 7.2.2, status: affected
version: 7.3.1, status: affected
version: 7.3.2, status: affected
version: 7.3.3, status: affected
version: 7.4.1, status: affected
version: 7.4.2, status: affected
version: 6.8.1, status: affected
version: 6.8.2, status: affected
version: 7.5.1, status: affected
version: 7.5.3, status: affected
version: 7.5.2, status: affected
version: 7.6.1, status: affected
version: 7.6.2, status: affected
version: 7.7.1, status: affected
version: 7.7.2, status: affected
version: 6.9.1, status: affected
version: 6.9.2, status: affected
}
metrics:
format: cvssV3_1
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
baseScore: 4.3
baseSeverity: MEDIUM
attackVector: NETWORK
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: REQUIRED
scope: UNCHANGED
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: LOW
]
exploits: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.