What is CVE-2021-1138?

CVE-2021-1138 is a critical-severity vulnerability in Cisco Smart Software Manager On-Prem, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2021-01-20.

How severe is CVE-2021-1138?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-1138 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Cisco Smart Software Manager On-Prem

CVE-2021-1138

Multiple vulnerabilities in the web UI of Cisco Smart Software Manager Satellite could allow an unauthenticated, remote attacker to execute arbitrary commands on the underlying operating system. For more information about these vulnerabilities, see the Details section of this advisory.

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

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

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.044 (91.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.044 · newest: 0.044 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

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

Frequently asked questions

What is CVE-2021-1138?: CVE-2021-1138 is a critical-severity vulnerability in Cisco Smart Software Manager On-Prem, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2021-01-20.
How severe is CVE-2021-1138?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-1138 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.