CVE-2020-3455— Cisco FXOS Software for Firepower 4100/9300 Series Appliances Secure Boot Bypass Vulnerability
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I. Basic Information for CVE-2020-3455
Vulnerability Information
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Vulnerability Title
Cisco FXOS Software for Firepower 4100/9300 Series Appliances Secure Boot Bypass Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability in the secure boot process of Cisco FXOS Software could allow an authenticated, local attacker to bypass the secure boot mechanisms. The vulnerability is due to insufficient protections of the secure boot process. An attacker could exploit this vulnerability by injecting code into a specific file that is then referenced during the device boot process. A successful exploit could allow the attacker to break the chain of trust and inject code into the boot process of the device which would be executed at each boot and maintain persistence across reboots.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
保护机制失效
Source: NVD (National Vulnerability Database)
Vulnerability Title
Cisco FXOS Software 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco FXOS Software是美国思科（Cisco）公司的一套运行在思科安全设备中的防火墙软件。 Cisco FXOS 存在安全漏洞，该漏洞源于安全引导过程的保护不够。攻击者可利用该漏洞可以利用这个漏洞，将代码注入到特定的文件中，然后在设备引导过程中引用该文件。攻击者可利用该漏洞破坏信任链，并将代码注入设备的引导过程中，该过程将在每次引导时执行，并在重新引导时保持持久性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Cisco | Cisco Firepower Extensible Operating System (FXOS) | n/a | - |
II. Public POCs for CVE-2020-3455
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fxos-sbbp-XTuPkYTnvendor-advisoryx_refsource_CISCO
- https://nvd.nist.gov/vuln/detail/CVE-2020-3455
Same Patch Batch · Cisco · 2020-10-21 · 40 CVEs total
| CVE-2020-3456 | 8.8 HIGH | Cisco FXOS Software Firepower Chassis Manager Cross-Site Request Forgery Vulnerability |
| CVE-2020-3373 | 8.6 HIGH | Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software IP Fragme |
| CVE-2020-3528 | 8.6 HIGH | Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software OSPFv2 Li |
| CVE-2020-3533 | 8.6 HIGH | Cisco Firepower Threat Defense Software SNMP Denial of Service Vulnerability |
| CVE-2020-3572 | 8.6 HIGH | Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software SSL/TLS S |
| CVE-2020-3529 | 8.6 HIGH | Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software SSL VPN D |
| CVE-2020-3514 | 8.2 HIGH | Cisco Firepower Threat Defense Software Multi-Instance Container Escape Vulnerability |
| CVE-2020-3410 | 8.1 HIGH | Cisco Firepower Management Center Software Common Access Card Authentication Bypass Vulner |
| CVE-2020-3555 | 6.8 MEDIUM | Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software SIP Denia |
| CVE-2020-3580 | 6.1 MEDIUM | Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Servi |
| CVE-2020-3582 | 6.1 MEDIUM | Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Servi |
| CVE-2020-3583 | 6.1 MEDIUM | Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Servi |
| CVE-2020-3599 | 6.1 MEDIUM | Cisco Adaptive Security Appliance Software Web-Based Management Interface Reflected Cross- |
| CVE-2020-3581 | 6.1 MEDIUM | Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Servi |
| CVE-2020-3565 | 5.8 MEDIUM | Cisco Firepower Threat Defense Software TCP Intercept Bypass Vulnerability |
| CVE-2020-3578 | 5.3 MEDIUM | Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software WebVPN Po |
| CVE-2020-3585 | 5.3 MEDIUM | Cisco Firepower 1000 Series Bleichenbacher Attack Vulnerability |
| CVE-2020-3557 | 5.3 MEDIUM | Cisco Firepower Management Center Software Denial of Service Vulnerability |
| CVE-2020-3558 | 4.7 MEDIUM | Cisco Firepower Management Center Software Open Redirect Vulnerability |
| CVE-2020-3299 | Multiple Cisco Products SNORT HTTP Detection Engine File Policy Bypass Vulnerability |
Showing top 20 of 40 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Cisco Firepower Extensible Operating System (FXOS)
- CVE-2026-20099
Cisco UCS Manager and FXOS Software Command Injection Vulner - CVE-2026-20091
Cisco UCS Manager and FXOS Software Stored Cross-Site Script - CVE-2022-20865
Cisco FXOS Software Command Injection Vulnerability - CVE-2020-3459
Cisco FXOS Software for Firepower 4100/9300 Series Command I - CVE-2020-3545
Cisco FXOS Software Buffer Overflow Vulnerability
Same vendor: Cisco
- CVE-2026-20224
Cisco Catalyst SD-WAN Manager XML External Entity Injection - CVE-2026-20210
Cisco Catalyst SD-WAN Manager Privilege Escalation Vulnerabi - CVE-2026-20209
Cisco Catalyst SD-WAN Manager Privilege Escalation Vulnerabi - CVE-2026-20182
Cisco Catalyst SD-WAN Controller Authentication Bypass Vulne - CVE-2026-20219
Cisco Slido 安全漏洞
V. Comments for CVE-2020-3455
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