CVE-2021-43045

Name: CVE-2021-43045
Creator: NVD / NIST
Published: 2022-01-06T18:15:07.863+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.96%

Last modified Jun 17, 2026

CVE-2021-43045 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 2.96% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

2.96%

85.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apache	Avro	< 1.11.0

References

http://www.openwall.com/lists/oss-security/2022/01/06/8Mailing List, Third Party Advisory
https://lists.apache.org/thread/5fttw9vk6gd2p3b846nox7hcj5469xfdMailing List, Vendor Advisory
http://www.openwall.com/lists/oss-security/2022/01/06/8Mailing List, Third Party Advisory
https://lists.apache.org/thread/5fttw9vk6gd2p3b846nox7hcj5469xfdMailing List, Vendor Advisory

Timeline

Published: Jan 6, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43045?

How severe is CVE-2021-43045?

CVE-2021-43045 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.96% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43045?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-43045?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST