RCE in Cisco iOS Xe Software
CVE-2020-3417
A vulnerability in Cisco IOS XE Software could allow an authenticated, local attacker to execute persistent code at boot time and break the chain of trust. This vulnerability is due to incorrect validations by boot scripts when specific ROM monitor (ROMMON) variables are set. An attacker could exploit this vulnerability by installing code to a specific directory in the underlying operating system (OS) and setting a specific ROMMON variable. A successful exploit could allow the attacker to execute persistent code on the underlying OS. To exploit this vulnerability, the attacker would need access to the root shell on the device or have physical access to the device.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (27.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Cisco iOS Xe Software
- Cisco iOS Xe — versions 3.18.0sp, 3.18.1asp, 3.18.1bsp
Weakness classification (CWE)
References
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xbace-On… (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2020-3417?
- CVE-2020-3417 is a medium-severity vulnerability in Cisco iOS Xe Software, classified under OS Command Injection. CVSS score: 6.8/10. Published 2020-09-24.
- How severe is CVE-2020-3417?
- Medium severity. CVSS v3 base score is 6.8 out of 10.