What is CVE-2021-1233?

CVE-2021-1233 is a medium-severity vulnerability in Cisco Catalyst Sd-Wan Manager, classified under Improper Input Validation. CVSS score: 4.4/10. Published 2021-01-20.

How severe is CVE-2021-1233?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Improper input validation in Cisco Catalyst Sd-Wan Manager

CVE-2021-1233

A vulnerability in the CLI of Cisco SD-WAN Software could allow an authenticated, local attacker to access sensitive information on an affected device. The vulnerability is due to insufficient input validation of requests that are sent to the iperf tool. An attacker could exploit this vulnerability by sending a crafted request to the iperf tool, which is included in Cisco SD-WAN Software. A successful exploit could allow the attacker to obtain any file from the filesystem of an affected device.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2021-01-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (24.2th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 24.2% 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)

CWE-20 — Improper Input Validation

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-in… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-1233?: CVE-2021-1233 is a medium-severity vulnerability in Cisco Catalyst Sd-Wan Manager, classified under Improper Input Validation. CVSS score: 4.4/10. Published 2021-01-20.
How severe is CVE-2021-1233?: Medium severity. CVSS v3 base score is 4.4 out of 10.