How severe is CVE-2025-14503?

CVE-2025-14503 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-14503 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-14503?

CVE-2025-14503 affects Amazon Harmonix. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-14503?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-14503 have an EU (EUVD) identifier?

Yes. CVE-2025-14503 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203445.

When was CVE-2025-14503 published?

CVE-2025-14503 was published on 2025-12-15 and last updated on 2026-06-17.

CVE-2025-14503

CVE-2025-14503 is a high-severity vulnerability in Amazon Harmonix with a CVSS 3.x base score of 7.2. 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-266.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v4: 8.6
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-203445
Weakness: CWE-266
Affected product: Amazon Harmonix
Published: 2025-12-15
Last modified: 2026-06-17

Description

An overly-permissive IAM trust policy in the Harmonix on AWS framework may allow IAM principals in the same AWS account to escalate privileges via role assumption. The sample code for the EKS environment provisioning role is configured to trust the account root principal, which may enable any IAM principal in the same AWS account with sts:AssumeRole permissions to assume the role with administrative privileges. We recommend customers upgrade to Harmonix on AWS v0.4.2 or later if you have deployed the framework using versions v0.3.0 through v0.4.1.

Frequently asked questions

What is CVE-2025-14503?: An overly-permissive IAM trust policy in the Harmonix on AWS framework may allow IAM principals in the same AWS account to escalate privileges via role assumption. The sample code for the EKS environment provisioning role is configured to trust the account root principal, which may enable any IAM principal in the same AWS account with sts:AssumeRole permissions to assume the role with administrative privileges. We recommend customers upgrade to Harmonix on AWS v0.4.2 or later if you have deployed the framework using versions v0.3.0 through v0.4.1.
How severe is CVE-2025-14503?: CVE-2025-14503 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-14503 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-14503?: CVE-2025-14503 affects Amazon Harmonix. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-14503?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-14503 have an EU (EUVD) identifier?: Yes. CVE-2025-14503 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203445.
When was CVE-2025-14503 published?: CVE-2025-14503 was published on 2025-12-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:amazon:harmonix:*:*:*:*:*:aws:*:*

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