How severe is CVE-2018-16528?

CVE-2018-16528 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-16528 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-16528?

CVE-2018-16528 affects Amazon Amazon Web Services Freertos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-16528?

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-2018-16528 published?

CVE-2018-16528 was published on 2018-12-06 and last updated on 2026-06-17.

CVE-2018-16528

CVE-2018-16528 is a high-severity vulnerability in Amazon Amazon Web Services Freertos with a CVSS 3.x base score of 8.1. 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-20.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.8
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Amazon Amazon Web Services Freertos
Published: 2018-12-06
Last modified: 2026-06-17

Description

Amazon Web Services (AWS) FreeRTOS through 1.3.1 allows remote attackers to execute arbitrary code because of mbedTLS context object corruption in prvSetupConnection and GGD_SecureConnect_Connect in AWS TLS connectivity modules.

Frequently asked questions

What is CVE-2018-16528?: Amazon Web Services (AWS) FreeRTOS through 1.3.1 allows remote attackers to execute arbitrary code because of mbedTLS context object corruption in prvSetupConnection and GGD_SecureConnect_Connect in AWS TLS connectivity modules.
How severe is CVE-2018-16528?: CVE-2018-16528 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-16528 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-16528?: CVE-2018-16528 affects Amazon Amazon Web Services Freertos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-16528?: 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-2018-16528 published?: CVE-2018-16528 was published on 2018-12-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:amazon:amazon_web_services_freertos:*:*:*:*:*:*:*:*

More vulnerabilities in Amazon Amazon Web Services Freertos

CVE-2018-16601 — High (CVSS 8.1): An issue was discovered in Amazon Web Services (AWS) FreeRTOS through 1.3.1, FreeRTOS up to V10.0.1 (with…
CVE-2018-16526 — High (CVSS 8.1): Amazon Web Services (AWS) FreeRTOS through 1.3.1, FreeRTOS up to V10.0.1 (with FreeRTOS+TCP), and WITTENSTEIN WHIS…
CVE-2018-16525 — High (CVSS 8.1): Amazon Web Services (AWS) FreeRTOS through 1.3.1, FreeRTOS up to V10.0.1 (with FreeRTOS+TCP), and WITTENSTEIN WHIS…
CVE-2018-16522 — High (CVSS 8.1): Amazon Web Services (AWS) FreeRTOS through 1.3.1 has an uninitialized pointer free in SOCKETS_SetSockOpt.
CVE-2019-13120 — High (CVSS 7.5): Amazon FreeRTOS up to and including v1.4.8 lacks length checking in prvProcessReceivedPublish, resulting in…
CVE-2018-16523 — High (CVSS 7.4): Amazon Web Services (AWS) FreeRTOS through 1.3.1, FreeRTOS up to V10.0.1 (with FreeRTOS+TCP), and WITTENSTEIN WHIS…

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