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Openshift Service MeshApplication · Redhat

CVE-2025-0752

HIGH · 7.1 CVSS v3.1 Published 2025-01-28
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
77/100
Remediation priority · High
Remotely reachable Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
A flaw was found in OpenShift Service Mesh 2.6.3 and 2.5.6. Rate-limiter avoidance, access-control bypass, CPU and memory exhaustion, and replay attacks may be possible due to improper HTTP header sanitization in Envoy.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

Improper HTTP header sanitization in Envoy (used by OpenShift Service Mesh 2.5.6 and 2.6.3) allows attackers to potentially bypass rate limiting and access controls, exhaust CPU/memory resources through malformed headers, and conduct replay attacks.

MitigationUpgrade OpenShift Service Mesh to patched versions when available; otherwise implement additional HTTP header validation at ingress points and monitor for anomalous header patterns.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Openshift Service MeshApplication
Affected:= 2.5.6= 2.6.3

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Confirm OpenShift Service Mesh installation
    Run 'oc get operators' or check OperatorHub for installed service mesh operators
    Affected if No Service Mesh operators are installed, the vulnerability does not apply
  2. Identify Service Mesh control plane version
    Run 'oc get smcp -A' to list Service Mesh Control Plane resources, then 'oc get smcp <name> -n <namespace> -o yaml' to view version details
    Affected if The smcp version field shows 2.5.6 or 2.6.3 exactly
  3. Verify Envoy proxy deployment
    Run 'oc get pods -n <istio-system> -l app=istio-ingressgateway' to check for ingress gateway pods, then 'oc get pods -n <namespace> -l app=envoy-proxy' for workloads
    Affected if Envoy proxies are deployed as part of the Service Mesh, enabling HTTP header processing
  4. Check for rate limiting or authorization policies
    Run 'oc get AuthorizationPolicy -A' and 'oc get RateLimitService -A' or check for RLS (Rate Limit Service) configurations in the istio-system namespace
    Affected if Rate limiting or authorization policies are defined, as these are the controls the CVE allows bypassing of
  5. Inspect Envoy configuration for header handling
    Run 'oc exec -n <istio-system> <istio-ingress-pod> -c istio-proxy -- curl localhost:15000/config_dump' to retrieve Envoy config, search for 'header' or 'sanitize' settings in the bootstrap or listener configs
    Affected if Envoy configuration shows active HTTP listener with header processing rules

You are affected if OpenShift Service Mesh versions 2.5.6 or 2.6.3 are installed with active Envoy proxies handling HTTP traffic.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade OpenShift Service Mesh to patched versions when available; otherwise implement additional HTTP header validation at ingress points and monitor for anomalous header patterns.

Recommended fix Moderate confidence

OpenShift Service Mesh 2.6.4 or later for 2.6.x line; 2.5.7 or later for 2.5.x line (verify exact versions in Red Hat advisory)

  1. 1. Review the official Red Hat security advisory for CVE-2025-0752 on access.redhat.com or bugzilla.redhat.com to confirm the exact fixed versions
  2. 2. Plan maintenance window for the upgrade
  3. 3. Backup current ServiceMeshControlPlane configuration
  4. 4. Upgrade OpenShift Service Mesh operator to the fixed version
  5. 5. Verify the control plane pods restart with the new version
  6. 6. Test critical paths to confirm rate limiting and access control function correctly
  7. 7. Monitor for any adverse effects post-upgrade
Caveat Review release notes for any configuration or API changes between affected and fixed versions; minor version upgrades typically backward compatible

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Openshift Service Mesh Scoped from the published advisory
  • Consultation8.0 h
  • Implementation16.0 h
  • Testing12.0 h
  • Review / QA8.0 h
44.0 hours of engineering $7,720
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-0752 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
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  • Version or environment caveats, and links to real fixes
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