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CVE-2021-34824: Istio (1.8.x, 1.9.0-1.9.5 and 1.10.0-1.10.1) contains a remotely exploitable vulnerability where credential...

Istio (1.8.x, 1.9.0-1.9.5 and 1.10.0-1.10.1) contains a remotely exploitable vulnerability where credentials specified in the Gateway and DestinationRule credentialName field can be accessed from different namespaces.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Certain Istio versions could allow credentials configured for gateways or destination rules in one namespace to be accessed from another namespace. For a business, the concern is exposure of service mesh credentials that may protect traffic routing or TLS identity boundaries.

Executive priority

Treat this as a priority if affected Istio versions are used in multi-namespace or multi-team clusters. Credential boundary failures can undermine service trust and require upgrade planning, configuration review, and possible secret rotation.

Technical view

CVE-2021-34824 affects Istio 1.8.x, 1.9.0 through 1.9.5, and 1.10.0 through 1.10.1. The issue involves cross-namespace access to credentials referenced by the Gateway and DestinationRule credentialName fields. The source describes it as remotely exploitable, but provides no CVSS, CWE, or detailed exploit conditions.

Likely exposure

Exposure is likely limited to organizations running the affected Istio versions and using Gateway or DestinationRule resources with credentialName fields. Risk depends on namespace tenancy, credential sensitivity, and whether untrusted users can create or influence Istio configuration.

Exploitation context

The provided CVE data says the vulnerability is remotely exploitable. It is not listed in CISA KEV, and the supplied sources do not state active exploitation in the wild.

Researcher notes

The source bundle identifies affected versions and the cross-namespace credential-access condition, but lacks CVSS, CWE, exploit prerequisites, and fixed-version details. Avoid assuming active exploitation or a specific patch level without consulting the Istio advisory and release notes.

Mitigation direction

  • Identify Istio control planes running affected 1.8.x, 1.9.0-1.9.5, or 1.10.0-1.10.1 versions.
  • Review the Istio security advisory and releases for fixed versions and upgrade guidance.
  • Audit Gateway and DestinationRule resources using credentialName across namespaces.
  • Restrict who can create or modify Istio networking resources and Kubernetes secrets.
  • Rotate exposed or high-value credentials if cross-namespace access is suspected.

Validation and detection

  • Inventory Istio versions across every cluster and mesh control plane.
  • Search Gateway and DestinationRule manifests for credentialName usage.
  • Map referenced credentials to namespaces and ownership boundaries.
  • Review RBAC for users or workloads allowed to modify Istio resources.
  • Check audit logs for unexpected reads or configuration changes involving mesh credentials.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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description · low confidence lookup

Credential and access behavior lookup

The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2021-34824 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.