Vulnerability in Cisco Firepower Extensible Operating System (Fxos)
CVE-2020-3455
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (26.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fxos-sbb… (vendor-advisory, Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2020-3455?
- CVE-2020-3455 is a high-severity vulnerability in Cisco Firepower Extensible Operating System (Fxos), classified under Protection Mechanism Failure. CVSS score: 7.8/10. Published 2020-10-21.
- How severe is CVE-2020-3455?
- High severity. CVSS v3 base score is 7.8 out of 10.