How severe is CVE-2021-3586?

CVE-2021-3586 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-2021-3586 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3586?

CVE-2021-3586 primarily affects Redhat Openshift Service Mesh. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-3586?

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-2021-3586 published?

CVE-2021-3586 was published on 2022-08-22 and last updated on 2026-06-17.

CVE-2021-3586

CVE-2021-3586 is a critical-severity vulnerability in Redhat Openshift Service Mesh 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-1188.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1188
Affected product: Redhat Openshift Service Mesh
Published: 2022-08-22
Last modified: 2026-06-17

Description

A flaw was found in servicemesh-operator. The NetworkPolicy resources installed for Maistra do not properly specify which ports may be accessed, allowing access to all ports on these resources from any pod. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Frequently asked questions

What is CVE-2021-3586?: A flaw was found in servicemesh-operator. The NetworkPolicy resources installed for Maistra do not properly specify which ports may be accessed, allowing access to all ports on these resources from any pod. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
How severe is CVE-2021-3586?: CVE-2021-3586 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-2021-3586 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3586?: CVE-2021-3586 primarily affects Redhat Openshift Service Mesh. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-3586?: 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-2021-3586 published?: CVE-2021-3586 was published on 2022-08-22 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:redhat:openshift_service_mesh:2.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:servicemesh-operator:2.0.5.1:*:*:*:*:*:*:*

More vulnerabilities in Redhat Openshift Service Mesh

CVE-2020-27846 — Critical (CVSS 9.8): A signature verification vulnerability exists in crewjam/saml. This flaw allows an attacker to bypass SAML…
CVE-2021-3495 — High (CVSS 8.8): An incorrect access control flaw was found in the kiali-operator in versions before 1.33.0 and before 1.24.7. This flaw…
CVE-2020-1764 — High (CVSS 8.6): A hard-coded cryptographic key vulnerability in the default configuration file was found in Kiali, all versions prior…
CVE-2019-9900 — High (CVSS 8.3): When parsing HTTP/1.x header values, Envoy 1.9.0 and before does not reject embedded zero characters (NUL, ASCII 0x0).…
CVE-2026-47774 — High (CVSS 7.5): Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.35.11,…
CVE-2023-44487 — High (CVSS 7.5): The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset…

All CVEs affecting Redhat Openshift Service Mesh →

Other CWE-1188 (Insecure Default Initialization of Resource) vulnerabilities

CVE-2026-31957 — Critical (CVSS 10.0): Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. From 3.0.0 to before 3.1.0, if…
CVE-2025-41672 — Critical (CVSS 10.0): A remote unauthenticated attacker may use default certificates to generate JWT Tokens and gain full access to the tool…
CVE-2024-0001 — Critical (CVSS 10.0): A condition exists in FlashArray Purity whereby a local account intended for initial array configuration remains active…
CVE-2024-2912 — Critical (CVSS 10.0): An insecure deserialization vulnerability exists in the BentoML framework, allowing remote code execution (RCE) by…
CVE-2021-34795 — Critical (CVSS 10.0): Multiple vulnerabilities in the web-based management interface of the Cisco Catalyst Passive Optical Network (PON)…
CVE-2017-7964 — Critical (CVSS 10.0): Zyxel WRE6505 devices have a default TELNET password of 1234 for the root and admin accounts, which makes it easier for…

Browse all CWE-1188 (Insecure Default Initialization of Resource) vulnerabilities →