# CVE-2020-25693: Integer overflow in CImg

> A specially crafted image file can trigger integer overflows and heap buffer overflows in CImg, causing application crashes or data corruption.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/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:** Yes
- **Published:** 3 Dec 2020
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2020-25693, DLA-2462-1, GHSA-vp99-jwhh-r3xw, MGASA-2020-0443, UBUNTU-CVE-2020-25693

## What is CVE-2020-25693?

CVE-2020-25693 is a high-severity vulnerability in Fedoraproject Fedora, published on 3 Dec 2020. 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 flaw was found in CImg in versions prior to 2.9.3. Integer overflows leading to heap buffer overflows in load_pnm() can be triggered by a specially crafted input file processed by CImg, which can lead to an impact to application availability or data integrity.

Weakness: CWE-787 (Out-of-bounds Write), CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2020-25693?

It affects 2 products.


Products: Cimg Cimg, Fedoraproject Fedora.

## How do I fix CVE-2020-25693?

Upgrade to a fixed version.

## Is CVE-2020-25693 being exploited?

There is no known exploitation of CVE-2020-25693 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2019-13568](https://insights.sbomify.com/CVE-2019-13568/): Memory corruption in n/a (high 8.8)
- [CVE-2023-41484](https://insights.sbomify.com/CVE-2023-41484/): Information disclosure in n/a (high 8.1)
- [CVE-2024-26540](https://insights.sbomify.com/CVE-2024-26540/): Memory corruption in n/a (high 7.8)
- [CVE-2018-7637](https://insights.sbomify.com/CVE-2018-7637/): Memory corruption in n/a (high 7.8)
- [CVE-2018-7638](https://insights.sbomify.com/CVE-2018-7638/): Memory corruption in n/a (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-25693 and fix it if it is affected.

What it is: CVE-2020-25693 is a high-severity vulnerability in Fedoraproject Fedora, published on 3 Dec 2020. 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-2020-25693 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2020-25693/ (Markdown: https://insights.sbomify.com/CVE-2020-25693/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-25693
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-25693
- OSV: https://osv.dev/vulnerability/CVE-2020-25693

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-25693/
Summaries are generated and may contain mistakes; the official description above is the record.