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

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-01-06 · updated 2026-06-17
Weakness: CWE-770

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.

Affected products

Apache Software Foundation Apache Avro: before 1.11.0 — fixed in 1.11.0

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Avro 1.11.0. Check the vendor advisory for mitigations.

References

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

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