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HIGH

CVE-2024-21661

CVSS v3

7.5

HIGH

EPSS Score

1.2 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • argo-cdBitnamiall versions · fixed in 2.10.4
  • github.com/argoproj/argo-cdGoall versions · no fixed version listed
  • github.com/argoproj/argo-cd/v2Goall versions · fixed in 2.8.13

Vendor advisories

  • CVE-2024-21661 Red Hat Product Security115 products fixed · 1 known affected

    argo-cd: Denial of Service Due to Unsafe Array Modification in Multi-threaded Environment

    odf4/odr-rhel8-operator as a component of Red Hat Openshift Data Foundation 4

  • RHSA-2024:1753 Red Hat Product Security35 products fixed

    Red Hat Security Advisory: Errata Advisory for Red Hat OpenShift GitOps v1.12.1 security update

  • RHSA-2024:1752 Red Hat Product Security14 products fixed

    Red Hat Security Advisory: GitOps 1.12.1- Argo CD CLI and MicroShift GitOps security update

  • RHSA-2024:1700 Red Hat Product Security33 products fixed

    Red Hat Security Advisory: Errata Advisory for Red Hat OpenShift GitOps v1.10.4 security update

  • RHSA-2024:1697 Red Hat Product Security33 products fixed

    Red Hat Security Advisory: Errata Advisory for Red Hat OpenShift GitOps v1.11.3 security update

Full record on NVD

Description

Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. Prior to versions 2.8.13, 2.9.9, and 2.10.4, an attacker can exploit a critical flaw in the application to initiate a Denial of Service (DoS) attack, rendering the application inoperable and affecting all users. The issue arises from unsafe manipulation of an array in a multi-threaded environment. The vulnerability is rooted in the application's code, where an array is being modified while it is being iterated over. This is a classic programming error but becomes critically unsafe when executed in a multi-threaded environment. When two threads interact with the same array simultaneously, the application crashes. This is a Denial of Service (DoS) vulnerability. Any attacker can crash the application continuously, making it impossible for legitimate users to access the service. The issue is exacerbated because it does not require authentication, widening the pool of potential attackers. Versions 2.8.13, 2.9.9, and 2.10.4 contain a patch for this issue.

Technical details

Published
2024-03-18

Frequently asked questions

What is CVE-2024-21661?

Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. Prior to versions 2.8.13, 2.9.9, and 2.10.4, an attacker can exploit a critical flaw in the application to initiate a Denial of Service (DoS) attack, rendering the application inoperable and affecting all users. The issue arises from unsafe manipulation of an array in a multi-threaded environment. The vulnerability is rooted in the application's code, where an array is being modified while it is being iterated over. This is a classic programming error but becomes critically unsafe when executed in a multi-threaded environment. When two threads interact with the same array simultaneously, the application crashes. This is a Denial of Service (DoS) vulnerability. Any attacker can crash the application continuously, making it impossible for legitimate users to access the service. The issue is exacerbated because it does not require authentication, widening the pool of potential attackers. Versions 2.8.13, 2.9.9, and 2.10.4 contain a patch for this issue.

Is CVE-2024-21661 actively exploited?

Active exploitation of CVE-2024-21661 has not been confirmed. Its EPSS score was 1.2% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2024-21661?

CVE-2024-21661 has a CVSS v3 base score of 7.5 (HIGH severity).

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