CVE-2021-34781: Cisco Firepower Threat Defense Software SSH Connections Denial of Service Vulnerability
First published: Wed Oct 27 2021(Updated: )
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.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Firepower Management Center Virtual Appliance | =6.3.0 | |
| Cisco Firepower Management Center Virtual Appliance | =6.4.0 | |
| Cisco Firepower Management Center Virtual Appliance | =6.4.0.13 | |
| Cisco Firepower Management Center Virtual Appliance | =6.5.0 | |
| Cisco Firepower Management Center Virtual Appliance | =6.6.0 | |
| Cisco Firepower Management Center Virtual Appliance | =6.7.0.3 | |
| Cisco Firepower Management Center Virtual Appliance | =6.7.1 | |
| Cisco Firepower Management Center Virtual Appliance | =7.0.0 | |
| Cisco Firepower Threat Defense | >=6.3.0<6.4.0.13 | |
| Cisco Firepower Threat Defense | >=6.5.0<6.6.5 | |
| Cisco Firepower Threat Defense | >=6.7.0<6.7.0.3 | |
| Cisco Firepower Threat Defense | >=7.0.0<7.0.1 | |
| Cisco Sourcefire Defense Center | =6.3.0 | |
| Cisco Sourcefire Defense Center | =6.4.0 | |
| Cisco Sourcefire Defense Center | =6.4.0.13 | |
| Cisco Sourcefire Defense Center | =6.5.0 | |
| Cisco Sourcefire Defense Center | =6.6.0 | |
| Cisco Sourcefire Defense Center | =6.7.0.3 | |
| Cisco Sourcefire Defense Center | =6.7.1 | |
| Cisco Sourcefire Defense Center | =7.0.0 |
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Reference Links
- collector/nvd-index
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/author
- agent/severity
- agent/title
- agent/last-modified-date
- agent/references
- agent/weakness
- agent/tags
- agent/description
- agent/first-publish-date
- agent/event
- vendor/cisco
- canonical/cisco firepower management center virtual appliance
- version/cisco firepower management center virtual appliance/6.3.0
- version/cisco firepower management center virtual appliance/6.4.0
- version/cisco firepower management center virtual appliance/6.4.0.13
- version/cisco firepower management center virtual appliance/6.5.0
- version/cisco firepower management center virtual appliance/6.6.0
- version/cisco firepower management center virtual appliance/6.7.0.3
- version/cisco firepower management center virtual appliance/6.7.1
- version/cisco firepower management center virtual appliance/7.0.0
- canonical/cisco firepower threat defense
- version/cisco firepower threat defense/6.3.0
- version/cisco firepower threat defense/6.5.0
- version/cisco firepower threat defense/6.7.0
- version/cisco firepower threat defense/7.0.0
- canonical/cisco sourcefire defense center
- version/cisco sourcefire defense center/6.3.0
- version/cisco sourcefire defense center/6.4.0
- version/cisco sourcefire defense center/6.4.0.13
- version/cisco sourcefire defense center/6.5.0
- version/cisco sourcefire defense center/6.6.0
- version/cisco sourcefire defense center/6.7.0.3
- version/cisco sourcefire defense center/6.7.1
- version/cisco sourcefire defense center/7.0.0