What is CVE-2017-20227?

CVE-2017-20227 is a critical-severity vulnerability in Varaneckas Jad Java Decompiler, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2026-03-28.

How severe is CVE-2017-20227?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Varaneckas Jad Java Decompiler

CVE-2017-20227

JAD Java Decompiler 1.5.8e-1kali1 and prior contains a stack-based buffer overflow vulnerability that allows attackers to execute arbitrary code by supplying overly long input that exceeds buffer boundaries. Attackers can craft malicious i…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (29.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Varaneckas Jad Java Decompiler — versions 1.5.8e

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

ExploitDB-42255 (exploit)
Official Product Homepage (product)
VulnCheck Advisory: JAD 1.5.8e-1kali1 Stack-Based Buffer Overflow (third-party-advisory)

Frequently asked questions

What is CVE-2017-20227?: CVE-2017-20227 is a critical-severity vulnerability in Varaneckas Jad Java Decompiler, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2026-03-28.
How severe is CVE-2017-20227?: Critical severity. CVSS v3 base score is 9.8 out of 10.