Vulnerability Description
A vulnerability in the processing of SSH connections for multi-instance deployments of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on the affected device. This vulnerability is due to a lack of proper error handling when an SSH session fails to be established. An attacker could exploit this vulnerability by sending a high rate of crafted SSH connections to the instance. A successful exploit could allow the attacker to cause resource exhaustion, which causes a DoS condition on the affected device. The device must be manually reloaded to recover.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Firepower Management Center Virtual Appliance | 6.3.0 |
| Cisco | Firepower Threat Defense | >= 6.3.0, < 6.4.0.13 |
| Cisco | Sourcefire Defense Center | 6.3.0 |
Related Weaknesses (CWE)
References
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fVendor Advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fVendor Advisory
FAQ
What is CVE-2021-34781?
CVE-2021-34781 is a vulnerability with a CVSS score of 8.6 (HIGH). A vulnerability in the processing of SSH connections for multi-instance deployments of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial o...
How severe is CVE-2021-34781?
CVE-2021-34781 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-2021-34781?
Check the references section above for vendor advisories and patch information. Affected products include: Cisco Firepower Management Center Virtual Appliance, Cisco Firepower Threat Defense, Cisco Sourcefire Defense Center.