CVE-2021-31572
CVE-2021-31572 is a critical-severity vulnerability in Amazon Freertos with a CVSS 3.x base score of 9.8. 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-190.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 7.5
- EPSS exploit prediction: 1% (69th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-190
- Affected product: Amazon Freertos
- Published:
- Last modified:
Description
The kernel in Amazon Web Services FreeRTOS before 10.4.3 has an integer overflow in stream_buffer.c for a stream buffer.
Frequently asked questions
- What is CVE-2021-31572?
- The kernel in Amazon Web Services FreeRTOS before 10.4.3 has an integer overflow in stream_buffer.c for a stream buffer.
- How severe is CVE-2021-31572?
- CVE-2021-31572 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-31572 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-31572?
- CVE-2021-31572 affects Amazon Freertos. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-31572?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2021-31572 published?
- CVE-2021-31572 was published on 2021-04-22 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:o:amazon:freertos:*:*:*:*:*:*:*:*
More vulnerabilities in Amazon Freertos
- CVE-2021-32020 — Critical (CVSS 9.8): The kernel in Amazon Web Services FreeRTOS before 10.4.3 has insufficient bounds checking during management of heap…
- CVE-2021-31571 — Critical (CVSS 9.8): The kernel in Amazon Web Services FreeRTOS before 10.4.3 has an integer overflow in queue.c for queue creation.
- CVE-2024-28115 — High (CVSS 8.8): FreeRTOS is a real-time operating system for microcontrollers. FreeRTOS Kernel versions through 10.6.1 do not…
- 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…
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