What is CVE-2021-30354?

CVE-2021-30354 is a high-severity vulnerability in Amazon Kindle, classified under Integer Overflow to Buffer Overflow. CVSS score: 8.6/10. Published 2021-09-01.

How severe is CVE-2021-30354?

High severity. CVSS v3 base score is 8.6 out of 10.

Is CVE-2021-30354 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Integer overflow in Amazon Kindle

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.

Published 2021-09-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.084 (94.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 94.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.084 · newest: 0.084 · change: 0.000

Affected products

Amazon Kindle
Amazon Kindle Firmware
Amazon Kindle E-Reader — versions All versions prior to and including 5.13.4

Weakness classification (CWE)

Public proof-of-concept exploits

References

research.checkpoint.com/2021/i-can-take-over-your-kindle/ (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-30354?: CVE-2021-30354 is a high-severity vulnerability in Amazon Kindle, classified under Integer Overflow to Buffer Overflow. CVSS score: 8.6/10. Published 2021-09-01.
How severe is CVE-2021-30354?: High severity. CVSS v3 base score is 8.6 out of 10.
Is CVE-2021-30354 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.