How severe is CVE-2020-27730?

CVE-2020-27730 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-27730 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-27730?

CVE-2020-27730 primarily affects F5 Nginx Controller. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-27730?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-27730 published?

CVE-2020-27730 was published on 2020-12-11 and last updated on 2026-06-17.

CVE-2020-27730

CVE-2020-27730 is a critical-severity vulnerability in F5 Nginx Controller with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: F5 Nginx Controller
Published: 2020-12-11
Last modified: 2026-06-17

Description

In versions 3.0.0-3.9.0, 2.0.0-2.9.0, and 1.0.1, the NGINX Controller Agent does not use absolute paths when calling system utilities.

Frequently asked questions

What is CVE-2020-27730?: In versions 3.0.0-3.9.0, 2.0.0-2.9.0, and 1.0.1, the NGINX Controller Agent does not use absolute paths when calling system utilities.
How severe is CVE-2020-27730?: CVE-2020-27730 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-27730 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-27730?: CVE-2020-27730 primarily affects F5 Nginx Controller. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-27730?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-27730 published?: CVE-2020-27730 was published on 2020-12-11 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:f5:nginx_controller:*:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_controller:1.0.1:*:*:*:*:*:*:*
cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*

More vulnerabilities in F5 Nginx Controller

CVE-2020-5901 — Critical (CVSS 9.6): In NGINX Controller 3.3.0-3.4.0, undisclosed API endpoints may allow for a reflected Cross Site Scripting (XSS) attack.…
CVE-2020-5900 — High (CVSS 8.8): In versions 3.0.0-3.4.0, 2.0.0-2.9.0, and 1.0.1, there is insufficient cross-site request forgery (CSRF) protections…
CVE-2020-5863 — High (CVSS 8.6): In NGINX Controller versions prior to 3.2.0, an unauthenticated attacker with network access to the Controller API can…
CVE-2020-5894 — High (CVSS 8.1): On versions 3.0.0-3.3.0, the NGINX Controller webserver does not invalidate the server-side session token after users…
CVE-2020-5867 — High (CVSS 8.1): In versions prior to 3.3.0, the NGINX Controller Agent installer script 'install.sh' uses HTTP instead of HTTPS to…
CVE-2021-23019 — High (CVSS 7.8): The NGINX Controller 2.0.0 thru 2.9.0 and 3.x before 3.15.0 Administrator password may be exposed in the systemd.txt…

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