What is CVE-2020-28963?

CVE-2020-28963 is a high-severity vulnerability in Krylack Zip Password Recovery, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.8/10. Published 2021-10-22.

How severe is CVE-2020-28963?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Krylack Zip Password Recovery

CVE-2020-28963

Passcovery Co. Ltd ZIP Password Recovery v3.70.69.0 was discovered to contain a buffer overflow via the decompress function.

Vulnerability class: Buffer Overflow

Published 2021-10-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (33.6th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Krylack Zip Password Recovery — versions 3.70.69.0
Microsoft Windows

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

www.vulnerability-lab.com/get_content.php (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-28963?: CVE-2020-28963 is a high-severity vulnerability in Krylack Zip Password Recovery, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.8/10. Published 2021-10-22.
How severe is CVE-2020-28963?: High severity. CVSS v3 base score is 7.8 out of 10.