What is CVE-2023-20066?

CVE-2023-20066 is a medium-severity vulnerability in Cisco 1000 Integrated Services Router, classified under Relative Path Traversal. CVSS score: 6.5/10. Published 2023-03-23.

How severe is CVE-2023-20066?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Path Traversal in Cisco 1000 Integrated Services Router

CVE-2023-20066

A vulnerability in the web UI of Cisco IOS XE Software could allow an authenticated, remote attacker to perform a directory traversal and access resources that are outside the filesystem mountpoint of the web UI. This vulnerability is due to an insufficient security configuration. An attacker could exploit this vulnerability by sending a crafted request to the web UI. A successful exploit could allow the attacker to gain read access to files that are outside the filesystem mountpoint of the web UI. Note: These files are located on a restricted filesystem that is maintained for the web UI. There is no ability to write to any files on this filesystem.

Published 2023-03-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.017 (77.4th percentile), scored 2026-11-01.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Weakness classification (CWE)

References

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2023-20066?: CVE-2023-20066 is a medium-severity vulnerability in Cisco 1000 Integrated Services Router, classified under Relative Path Traversal. CVSS score: 6.5/10. Published 2023-03-23.
How severe is CVE-2023-20066?: Medium severity. CVSS v3 base score is 6.5 out of 10.