CVE-2019-12806: UniSign 2.0.4.0 and earlier version contains a stack-based buffer overflow vulnerability which can overwrite t

Q: How do I fix CVE-2019-12806?

unisign: upgrade to newer than 2.0.4.0. Exact commands for each OS are on this page.

Q: Is CVE-2019-12806 being exploited?

CVE-2019-12806 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-12806 affect?

CVE-2019-12806 affects unisign. Severity is high (CVSS 8.8). 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 craf

Q: How urgent is CVE-2019-12806?

Priority 54/100. High severity; EPSS top 9%: very likely to be exploited

This month

HIGH 8.8UPGRADE

CVE-2019-12806 is a high-severity flaw (CVSS 8.8) affecting unisign. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
EPSS top 9%: very likely to be exploited

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	4.1% (top 9%)
CISA exploited list	No
Weakness	CWE-119, CWE-787
Published	2019-08-13
Last modified	2026-06-17

Publisher (CNA): KrCERT/CC · Vendor: crosscert

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-08-13 20:15 UTCPublished CVE record published
2026-06-17 02:15 UTCUpdated Record last modified

crosscert unisign UPGRADE

Affected: <= 2.0.4.0

Fixed in: newer than 2.0.4.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy unisign || rpm -q unisign || unisign --version

2. UPGRADE to newer than 2.0.4.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade unisign

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade unisign

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-12806?

unisign: upgrade to newer than 2.0.4.0. Exact commands for each OS are on this page.

Is CVE-2019-12806 being exploited?

CVE-2019-12806 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-12806 affect?

CVE-2019-12806 affects unisign. Severity is high (CVSS 8.8). 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 craf

How urgent is CVE-2019-12806?

Priority 54/100. High severity; EPSS top 9%: very likely to be exploited

References

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