Vulnerability Description
A vulnerability in the Rate Limiting Network Address Translation (NAT) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause high CPU utilization in the Cisco QuantumFlow Processor of an affected device, resulting in a denial of service (DoS) condition. This vulnerability is due to mishandling of the rate limiting feature within the QuantumFlow Processor. An attacker could exploit this vulnerability by sending large amounts of traffic that would be subject to NAT and rate limiting through an affected device. A successful exploit could allow the attacker to cause the QuantumFlow Processor utilization to reach 100 percent on the affected device, resulting in a DoS condition.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Ios Xe | <= 17.3.3 |
| Cisco | Asr 1000 | - |
| Cisco | Asr 1000-Esp100 | - |
| Cisco | Asr 1000-X | - |
| Cisco | Asr 1001 | - |
| Cisco | Asr 1001-Hx | - |
| Cisco | Asr 1001-Hx R | - |
| Cisco | Asr 1001-X | - |
| Cisco | Asr 1001-X R | - |
| Cisco | Asr 1002 | - |
| Cisco | Asr 1002-Hx | - |
| Cisco | Asr 1002-Hx R | - |
| Cisco | Asr 1002-X | - |
| Cisco | Asr 1002-X R | - |
| Cisco | Asr 1004 | - |
| Cisco | Asr 1006 | - |
| Cisco | Asr 1006-X | - |
| Cisco | Asr 1009-X | - |
| Cisco | Asr 1013 | - |
| Cisco | Asr 1023 | - |
Related Weaknesses (CWE)
References
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-rVendor Advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-rVendor Advisory
FAQ
What is CVE-2021-1624?
CVE-2021-1624 is a vulnerability with a CVSS score of 8.6 (HIGH). A vulnerability in the Rate Limiting Network Address Translation (NAT) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause high CPU utilization in the Cisco Quant...
How severe is CVE-2021-1624?
CVE-2021-1624 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-2021-1624?
Check the references section above for vendor advisories and patch information. Affected products include: Cisco Ios Xe, Cisco Asr 1000, Cisco Asr 1000-Esp100, Cisco Asr 1000-X, Cisco Asr 1001.