CVE-2020-9054

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2022-03-25. Federal remediation due 2022-04-15.

SSVC decision

• ExploitationactiveCISA reports credible evidence of active exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

99.98% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 99.9% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-10-08.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2020-03-04 19:30Z6 YR AGO

Last updated

2026-10-07 17:32Z21 DAYS AGO

Reserved

2020-02-18

Assigning CNA

certcc

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

• CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')Base

Data version

5.2

Document digest

0db466f5ec66e429a8c16c3c3933beb57bbace713b46ac1b705c0416ee17c7ae

• cwe.mitre.orghttps://cwe.mitre.org/data/definitions/78.htmlx_refsource_MISC
• www.zyxel.comhttps://www.zyxel.com/support/remote-code-execution-vulnerability-of-NAS-products.shtmlx_refsource_CONFIRM
• kb.cert.orgVU#498544https://kb.cert.org/vuls/id/498544/third-party-advisoryx_refsource_CERT-VN
• kb.cert.orghttps://kb.cert.org/artifacts/cve-2020-9054.htmlx_refsource_MISC
• krebsonsecurity.comhttps://krebsonsecurity.com/2020/02/zyxel-fixes-0day-in-network-storage-devices/x_refsource_MISC
• www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-9054government-resource