Vulnerability Description
A vulnerability in the network stack of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability exists because the software improperly releases resources when it processes certain IPv6 packets that are destined to an affected device. An attacker could exploit this vulnerability by sending multiple crafted IPv6 packets to an affected device. A successful exploit could cause the network stack to run out of available buffers, impairing operations of control plane and management plane protocols and resulting in a DoS condition. Manual intervention would be required to restore normal operations on the affected device. For more information about the impact of this vulnerability, see the Details section of this advisory.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Unified Computing System | >= 4.0, < 4.0\(4k\) |
| Cisco | Ucs 64108 | - |
| Cisco | Ucs 6454 | - |
| Cisco | Nx-Os | 7.0\(0\)n1\(1\) |
| Cisco | Nexus 5548P | - |
| Cisco | Nexus 5548Up | - |
| Cisco | Nexus 5596T | - |
| Cisco | Nexus 5596Up | - |
| Cisco | Nexus 56128P | - |
| Cisco | Nexus 5624Q | - |
| Cisco | Nexus 5648Q | - |
| Cisco | Nexus 5672Up | - |
| Cisco | Nexus 5672Up-16G | - |
| Cisco | Nexus 5696Q | - |
| Cisco | Nexus 3016 | - |
| Cisco | Nexus 3016Q | - |
| Cisco | Nexus 3048 | - |
| Cisco | Nexus 3064 | - |
| Cisco | Nexus 3064-32T | - |
| Cisco | Nexus 3064-T | - |
Related Weaknesses (CWE)
References
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nVendor Advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nVendor Advisory
FAQ
What is CVE-2021-1387?
CVE-2021-1387 is a vulnerability with a CVSS score of 8.6 (HIGH). A vulnerability in the network stack of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability exis...
How severe is CVE-2021-1387?
CVE-2021-1387 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-2021-1387?
Check the references section above for vendor advisories and patch information. Affected products include: Cisco Unified Computing System, Cisco Ucs 64108, Cisco Ucs 6454, Cisco Nx-Os, Cisco Nexus 5548P.