# CVE-2019-12806: Memory corruption in UniSign

> Remote attackers can execute arbitrary code via crafted HTTPS packets due to a stack-based buffer overflow in UniSign.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 13 Aug 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-fcj6-53h4-pjm3

## What is CVE-2019-12806?

CVE-2019-12806 is a high-severity memory corruption vulnerability in CROSSCERT UniSign, published on 13 Aug 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

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.

Weakness: CWE-787 (Out-of-bounds Write), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2019-12806?

It affects 1 product.


Products: Crosscert Unisign.

## How do I fix CVE-2019-12806?

No fix has been published for CVE-2019-12806 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-12806 being exploited?

There is no known exploitation of CVE-2019-12806 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-12806 and fix it if it is affected.

What it is: CVE-2019-12806 is a high-severity memory corruption vulnerability in CROSSCERT UniSign, published on 13 Aug 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2019-12806 in the wild and no public exploit code.

Affected product: CROSSCERT UniSign. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2019-12806/ (Markdown: https://insights.sbomify.com/CVE-2019-12806/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-12806
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-12806
- OSV: https://osv.dev/vulnerability/CVE-2019-12806

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-12806/
Summaries are generated and may contain mistakes; the official description above is the record.