# CVE-2021-3477: Integer overflow in OpenEXR

> An attacker can cause a denial of service in applications using OpenEXR by submitting a crafted file that triggers an integer overflow and out-of-bounds read.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 31 Mar 2021
- **Updated:** 3 Aug 2024
- **Also known as:** AZL-44628, DEBIAN-CVE-2021-3477, GHSA-wr39-hjqv-c783, UBUNTU-CVE-2021-3477

## What is CVE-2021-3477?

CVE-2021-3477 is a medium-severity vulnerability in Debian Debian Linux, published on 31 Mar 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

There's a flaw in OpenEXR's deep tile sample size calculations in versions before 3.0.0-beta. An attacker who is able to submit a crafted file to be processed by OpenEXR could trigger an integer overflow, subsequently leading to an out-of-bounds read. The greatest risk of this flaw is to application availability.

Weakness: CWE-125 (Out-of-bounds Read), CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2021-3477?

It affects 2 products.


Products: Debian Debian Linux, Openexr Openexr.

## How do I fix CVE-2021-3477?

Upgrade to a fixed version.

## Is CVE-2021-3477 being exploited?

There is no known exploitation of CVE-2021-3477 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-3477 and fix it if it is affected.

What it is: CVE-2021-3477 is a medium-severity vulnerability in Debian Debian Linux, published on 31 Mar 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-3477 in the wild and no public exploit code.

Affected product: Debian Debian Linux. 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-2021-3477/ (Markdown: https://insights.sbomify.com/CVE-2021-3477/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-3477
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-3477
- OSV: https://osv.dev/vulnerability/CVE-2021-3477

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-3477/
Summaries are generated and may contain mistakes; the official description above is the record.