CVE-2021-34756
HIGHCVSS 7.8/10EPSS 0.26%
Last modified
CVE-2021-34756 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Multiple vulnerabilities in the CLI of Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to execute arbitrary commands with root privileges. For more information about these vulnerabilities, see the Details section of this advisory.. EPSS estimates a 0.26% chance of exploitation in the next 30 days.
Description
Multiple vulnerabilities in the CLI of Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to execute arbitrary commands with root privileges. For more information about these vulnerabilities, see the Details section of this advisory.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Firepower Management Center Virtual Appliance | 6.1.0 |
| Cisco | Firepower Management Center Virtual Appliance | 6.2.0 |
| Cisco | Firepower Management Center Virtual Appliance | 6.2.3 |
| Cisco | Firepower Management Center Virtual Appliance | 6.3.0 |
| Cisco | Firepower Management Center Virtual Appliance | 6.4.0 |
| Cisco | Firepower Management Center Virtual Appliance | 6.4.0.11 |
| Cisco | Firepower Management Center Virtual Appliance | 6.5.0 |
| Cisco | Firepower Management Center Virtual Appliance | 6.6.0 |
| Cisco | Firepower Management Center Virtual Appliance | 6.6.1 |
| Cisco | Firepower Management Center Virtual Appliance | 6.7.0 |
| Cisco | Firepower Management Center Virtual Appliance | 7.0.0 |
| Cisco | Firepower Management Center Virtual Appliance | 7.1.0 |
| Cisco | Firepower Threat Defense | >= 6.4.0, < 6.4.0.13 |
| Cisco | Firepower Threat Defense | >= 6.6.0, < 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 | 6.1.0 |
| Cisco | Sourcefire Defense Center | 6.2.0 |
| Cisco | Sourcefire Defense Center | 6.2.3 |
| Cisco | Sourcefire Defense Center | 6.3.0 |
| Cisco | Sourcefire Defense Center | 6.4.0 |
| Cisco | Sourcefire Defense Center | 6.4.0.11 |
| Cisco | Sourcefire Defense Center | 6.5.0 |
| Cisco | Sourcefire Defense Center | 6.6.0 |
| Cisco | Sourcefire Defense Center | 6.6.1 |
| Cisco | Sourcefire Defense Center | 6.7.0 |
| Cisco | Sourcefire Defense Center | 7.0.0 |
| Cisco | Sourcefire Defense Center | 7.1.0 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-34756?
Multiple vulnerabilities in the CLI of Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to execute arbitrary commands with root privileges. For more information about these vulnerabilities, see the Details section of this advisory.
How severe is CVE-2021-34756?
CVE-2021-34756 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.26% probability of exploitation in the next 30 days.
How do I fix CVE-2021-34756?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-34756?
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