How severe is CVE-2021-30355?

CVE-2021-30355 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-30355 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-30355?

CVE-2021-30355 affects Amazon Kindle Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-30355?

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-2021-30355 published?

CVE-2021-30355 was published on 2021-09-01 and last updated on 2026-06-17.

CVE-2021-30355

CVE-2021-30355 is a high-severity vulnerability in Amazon Kindle Firmware with a CVSS 3.x base score of 8.6. 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-269.

Key facts

Severity: High (CVSS 3.x base score 8.6)
CVSS v2: 9.3
EPSS exploit prediction: 7% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-269
Affected product: Amazon Kindle Firmware
Published: 2021-09-01
Last modified: 2026-06-17

Description

Amazon Kindle e-reader prior to and including version 5.13.4 improperly manages privileges, allowing the framework user to elevate privileges to root.

Frequently asked questions

What is CVE-2021-30355?: Amazon Kindle e-reader prior to and including version 5.13.4 improperly manages privileges, allowing the framework user to elevate privileges to root.
How severe is CVE-2021-30355?: CVE-2021-30355 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-30355 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-30355?: CVE-2021-30355 affects Amazon Kindle Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-30355?: 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-2021-30355 published?: CVE-2021-30355 was published on 2021-09-01 and last updated on 2026-06-17.

References

https://research.checkpoint.com/2021/i-can-take-over-your-kindle/

Affected products (1)

cpe:2.3:o:amazon:kindle_firmware:*:*:*:*:*:*:*:*

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