How severe is CVE-2019-12243?

CVE-2019-12243 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-12243 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-12243?

CVE-2019-12243 affects Istio. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-12243?

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.

When was CVE-2019-12243 published?

CVE-2019-12243 was published on 2019-06-05 and last updated on 2026-06-17.

CVE-2019-12243

CVE-2019-12243 is a high-severity vulnerability in Istio with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.4
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Istio
Published: 2019-06-05
Last modified: 2026-06-17

Description

Istio 1.1.x through 1.1.6 has Incorrect Access Control.

Frequently asked questions

What is CVE-2019-12243?: Istio 1.1.x through 1.1.6 has Incorrect Access Control.
How severe is CVE-2019-12243?: CVE-2019-12243 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-12243 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-12243?: CVE-2019-12243 affects Istio. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-12243?: 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.
When was CVE-2019-12243 published?: CVE-2019-12243 was published on 2019-06-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*

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