CVE-2021-30354: Amazon Kindle Firmware

High severity, CVSS 8.6. EPSS: 8.4% chance of exploitation in the next 30 days.

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.

Affected products

• Amazon Kindle Firmware: up to and including 5.13.4

Published 2021-09-01. Last modified 2026-06-17.