How severe is CVE-2021-30354?

CVE-2021-30354 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-2021-30354 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-2021-30354?

CVE-2021-30354 affects Amazon Kindle Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-30354?

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-2021-30354 published?

CVE-2021-30354 was published on 2021-09-01 and last updated on 2026-06-17.

CVE-2021-30354

CVE-2021-30354 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-190.

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-190
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 contains an Integer Overflow that leads to a Heap-Based Buffer Overflow in function CJBig2Image::expand() and results in a memory corruption that leads to code execution when parsing a crafted PDF book.

Frequently asked questions

What is CVE-2021-30354?: Amazon Kindle e-reader prior to and including version 5.13.4 contains an Integer Overflow that leads to a Heap-Based Buffer Overflow in function CJBig2Image::expand() and results in a memory corruption that leads to code execution when parsing a crafted PDF book.
How severe is CVE-2021-30354?: CVE-2021-30354 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-2021-30354 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-2021-30354?: CVE-2021-30354 affects Amazon Kindle Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-30354?: 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-2021-30354 published?: CVE-2021-30354 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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