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Fencer Vulns
high 7.5

CVE-2021-43045 json

Possible DOS vulnerabilities in C# Avro SDK

published 2022-01-06 4 y ago modified 2026-06-17 4 mo ago also GHSA-868x-rg4c-cjqg , EUVD-2022-0519

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.1%
EPSS 3.1% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

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.

Patch / fix

  • nuget Apache.Avro 1.11.0
  • apache avro 1.11.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-43045 updated cvss 7.5

apache-avro: allows attackers to allocate excessive resources potentially causing a DoS

  • Red Hat Fuse 7 avro Red Hat Integration Camel K 1 avro Red Hat Integration Service Registry avro Red Hat JBoss Data Grid 7 avro Red Hat JBoss Data Virtualization 6 avro Red Hat JBoss Enterprise Application Platform 6 avro
    +7 more products
    Red Hat JBoss Enterprise Application Platform 7 avro Red Hat JBoss Enterprise Application Platform Expansion Pack avro Red Hat JBoss Fuse 6 avro Red Hat JBoss Fuse Service Works 6 avro Red Hat JBoss Operations Network 3 avro Red Hat OpenShift Container Platform 4 openshift4/ose-metering-hive, openshift4/ose-metering-hadoop, openshift4/ose-metering-presto Red Hat Single Sign-On 7 avro
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.06% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
nuget Apache.Avro
<1.11.0
1.11.0

Affected products

  • Apache Software Foundation Apache Avro

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.