Vulnerability in Cisco iOS Xe Software
CVE-2021-1390
A vulnerability in one of the diagnostic test CLI commands of Cisco IOS XE Software could allow an authenticated, local attacker to execute arbitrary code on an affected device. To exploit this vulnerability, the attacker would need to have valid user credentials at privilege level 15. This vulnerability exists because the affected software permits modification of the run-time memory of an affected device under specific circumstances. An attacker could exploit this vulnerability by authenticating to the affected device and issuing a specific diagnostic test command at the CLI. A successful exploit could trigger a logic error in the code that was designed to restrict run-time memory modifications. The attacker could take advantage of this logic error to overwrite system memory locations and execute arbitrary code on the underlying Linux operating system (OS) of the affected device.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (25.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.9% 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
- Cisco iOS Xe Software
- Cisco iOS Xe — versions 16.8.1, 16.8.1a, 16.8.1b
Weakness classification (CWE)
References
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-XE-OFP-6… (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-1390?
- CVE-2021-1390 is a medium-severity vulnerability in Cisco iOS Xe Software, classified under Write-what-where Condition. CVSS score: 5.1/10. Published 2021-03-24.
- How severe is CVE-2021-1390?
- Medium severity. CVSS v3 base score is 5.1 out of 10.