Vulnerability Description
A vulnerability in the Multicast Leaf Recycle Elimination (mLRE) feature of Cisco IOS XE Software for Cisco ASR 1000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition. This vulnerability is due to incorrect handling of certain IPv6 multicast packets when they are fanned out more than seven times on an affected device. An attacker could exploit this vulnerability by sending a specific IPv6 multicast or IPv6 multicast VPN (MVPNv6) packet through the affected device. A successful exploit could allow the attacker to cause a reload of the affected device, resulting in a DoS condition.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Ios Xe | 3.7.1s |
| Cisco | Asr1000-Esp100 | - |
| Cisco | Asr1000-Esp200 | - |
| Cisco | Asr1000-Esp40 | - |
| Cisco | Asr1001-Hx | - |
| Cisco | Asr1001-X | - |
| Cisco | Asr1002-Hx | - |
| Cisco | Asr1002-X | - |
Related Weaknesses (CWE)
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/ciMitigationVendor Advisory
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/ciMitigationVendor Advisory
FAQ
What is CVE-2023-20187?
CVE-2023-20187 is a vulnerability with a CVSS score of 8.6 (HIGH). A vulnerability in the Multicast Leaf Recycle Elimination (mLRE) feature of Cisco IOS XE Software for Cisco ASR 1000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker...
How severe is CVE-2023-20187?
CVE-2023-20187 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-20187?
Check the references section above for vendor advisories and patch information. Affected products include: Cisco Ios Xe, Cisco Asr1000-Esp100, Cisco Asr1000-Esp200, Cisco Asr1000-Esp40, Cisco Asr1001-Hx.