How severe is CVE-2021-23055?

CVE-2021-23055 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-23055 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-23055?

CVE-2021-23055 affects F5 Nginx Ingress Controller. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-23055?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-23055 published?

CVE-2021-23055 was published on 2022-04-21 and last updated on 2026-06-17.

CVE-2021-23055

CVE-2021-23055 is a medium-severity vulnerability in F5 Nginx Ingress Controller with a CVSS 3.x base score of 6.5. 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-732.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-732
Affected product: F5 Nginx Ingress Controller
Published: 2022-04-21
Last modified: 2026-06-17

Description

On version 2.x before 2.0.3 and 1.x before 1.12.3, the command line restriction that controls snippet use with NGINX Ingress Controller does not apply to Ingress objects. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Frequently asked questions

What is CVE-2021-23055?: On version 2.x before 2.0.3 and 1.x before 1.12.3, the command line restriction that controls snippet use with NGINX Ingress Controller does not apply to Ingress objects. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
How severe is CVE-2021-23055?: CVE-2021-23055 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-23055 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23055?: CVE-2021-23055 affects F5 Nginx Ingress Controller. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23055?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-23055 published?: CVE-2021-23055 was published on 2022-04-21 and last updated on 2026-06-17.

References

https://support.f5.com/csp/article/K01051452

Affected products (1)

cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*

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