# CVE-2020-13545: Memory corruption in Softmaker

> A heap-based buffer overflow in SoftMaker TextMaker allows remote code execution via a specially crafted document.

- **Severity:** High 8.8 (`CVSS:3.0/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:** 6 Jan 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-7q67-hcv3-7rj3

## What is CVE-2020-13545?

CVE-2020-13545 is a high-severity memory corruption vulnerability in Softmaker, published on 6 Jan 2021. 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

An exploitable signed conversion vulnerability exists in the TextMaker document parsing functionality of SoftMaker Office 2021’s TextMaker application. A specially crafted document can cause the document parser to miscalculate a length used to allocate a buffer, later upon usage of this buffer the application will write outside its bounds resulting in a heap-based memory corruption. An attacker can entice the victim to open a document to trigger this vulnerability.

Weakness: CWE-787 (Out-of-bounds Write), CWE-681 (Incorrect Conversion between Numeric Types), CWE-196 (Unsigned to Signed Conversion Error)

## Which versions are affected by CVE-2020-13545?

It affects 1 product.


Products: Softmaker Softmaker Office.

## How do I fix CVE-2020-13545?

No fix has been published for CVE-2020-13545 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-13545 being exploited?

There is no known exploitation of CVE-2020-13545 in the wild and no public exploit code.

## Other vulnerabilities in Softmaker

- [CVE-2020-13544](https://insights.sbomify.com/CVE-2020-13544/): Integer overflow in Softmaker (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-13545 and fix it if it is affected.

What it is: CVE-2020-13545 is a high-severity memory corruption vulnerability in Softmaker, published on 6 Jan 2021. 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-2020-13545 in the wild and no public exploit code.

Affected product: Softmaker. 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-2020-13545/ (Markdown: https://insights.sbomify.com/CVE-2020-13545/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-13545
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-13545
- OSV: https://osv.dev/vulnerability/CVE-2020-13545

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-13545/
Summaries are generated and may contain mistakes; the official description above is the record.