What is CVE-2019-12806?

CVE-2019-12806 is a high-severity vulnerability in Crosscert Unisign, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2019-08-13.

How severe is CVE-2019-12806?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Crosscert Unisign

CVE-2019-12806

UniSign 2.0.4.0 and earlier version contains a stack-based buffer overflow vulnerability which can overwrite the stack with arbitrary data, due to a buffer overflow in a library. That leads remote attacker to execute arbitrary code via crafted https packets.

Vulnerability class: Buffer Overflow

Published 2019-08-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.041 (90.5th percentile), scored 2026-10-06.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.041 · newest: 0.041 · change: 0.000

Affected products

Crosscert Unisign — versions 2.0.4.0
Microsoft Windows

Weakness classification (CWE)

References

www.boho.or.kr/krcert/secNoticeView.do (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2019-12806?: CVE-2019-12806 is a high-severity vulnerability in Crosscert Unisign, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2019-08-13.
How severe is CVE-2019-12806?: High severity. CVSS v3 base score is 8.8 out of 10.