# CVE-2020-13586: Memory corruption in Softmaker

> A heap buffer overflow in SoftMaker PlanMaker allows attackers to execute arbitrary code via a specially crafted Excel file.

- **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:** 4 Feb 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-rcvq-ww93-m6mr

## What is CVE-2020-13586?

CVE-2020-13586 is a high-severity memory corruption vulnerability in Softmaker, published on 4 Feb 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

A memory corruption vulnerability exists in the Excel Document SST Record 0x00fc functionality of SoftMaker Software GmbH SoftMaker Office PlanMaker 2021 (Revision 1014). A specially crafted malformed file can lead to a heap buffer overflow. An attacker can provide a malicious file to trigger this vulnerability.

Weakness: CWE-787 (Out-of-bounds Write), CWE-122 (Heap-based Buffer Overflow)

## Which versions are affected by CVE-2020-13586?

It affects 1 product.


Products: Softmaker Planmaker 2021.

## How do I fix CVE-2020-13586?

No fix has been published for CVE-2020-13586 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-13586 being exploited?

There is no known exploitation of CVE-2020-13586 in the wild and no public exploit code.

## Other vulnerabilities in Softmaker

- [CVE-2020-28587](https://insights.sbomify.com/CVE-2020-28587/): Memory corruption in Softmaker (high 8.8)
- [CVE-2020-13581](https://insights.sbomify.com/CVE-2020-13581/): Memory corruption in SoftMaker (high 8.8)
- [CVE-2020-27250](https://insights.sbomify.com/CVE-2020-27250/): Memory corruption in SoftMaker (high 8.8)
- [CVE-2020-13579](https://insights.sbomify.com/CVE-2020-13579/): Integer overflow in Softmaker Software (high 8.8)
- [CVE-2020-13580](https://insights.sbomify.com/CVE-2020-13580/): Memory corruption in Softmaker Software (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-13586 and fix it if it is affected.

What it is: CVE-2020-13586 is a high-severity memory corruption vulnerability in Softmaker, published on 4 Feb 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-2020-13586 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-2020-13586/ (Markdown: https://insights.sbomify.com/CVE-2020-13586/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-13586
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-13586
- OSV: https://osv.dev/vulnerability/CVE-2020-13586

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-13586/
Summaries are generated and may contain mistakes; the official description above is the record.