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CVE-2021-3586

30
FAUCET Score

CVE-2021-3586 is a critical vulnerability affecting Red Hat OpenShift Service Mesh and servicemesh-operator. It stems from improperly configured NetworkPolicy resources, which fail to restrict port access, allowing any pod to access all ports on these resources. With a CVSS score of 9.8 (CRITICAL), this flaw presents a significant risk to data confidentiality, integrity, and system availability due to its network-based, low-complexity attack vector. Despite its severity, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
2.0CPE matchmatch criteria
cpe:2.3:a:redhat:openshift_service_mesh:2.0:*:*:*:*:*:*:*
2.0.5.1CPE matchmatch criteria
cpe:2.3:a:redhat:servicemesh-operator:2.0.5.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.88%
Probability of exploitation in next 30 days
EPSS Percentile
55.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0088 is in the 40th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

redhatpatch availablevia redhat_api
Product: OpenShift Service Mesh 2.0Fixed in: servicemesh-operator-0:2.0.5-3.el8
View patch
redhatvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2021-3586Important

servicemesh-operator: NetworkPolicy resources incorrectly specify ports for ingress resources

Jun 10, 2021

References

access.redhat.com / security/cve/CVE-2021-3586
Vendor Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingVendor Advisory