{"cve":"CVE-2024-21661","nvd":{"published":"2024-03-18T19:15:06.687","modified":"2026-06-17T07:09:56.527","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-787"],"references":["https://github.com/argoproj/argo-cd/blob/54601c8fd30b86a4c4b7eb449956264372c8bde0/util/session/sessionmanager.go#L302-L311","https://github.com/argoproj/argo-cd/commit/2a22e19e06aaf6a1e734443043310a66c234e345","https://github.com/argoproj/argo-cd/commit/5bbb51ab423f273dda74ab956469843d2db2e208","https://github.com/argoproj/argo-cd/commit/ce04dc5c6f6e92033221ec6d96b74403b065ca8b","https://github.com/argoproj/argo-cd/security/advisories/GHSA-6v85-wr92-q4p7"],"products":["argoproj:argo_cd"],"source":"nvd","synced_at":"2026-10-19T21:46:54.846886191+00:00"},"epss":{"cve":"CVE-2024-21661","score":0.01176,"percentile":0.6759,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-6v85-wr92-q4p7","url":"https://osv.dev/vulnerability/GHSA-6v85-wr92-q4p7","summary":"Denial of Service (DoS) Vulnerability Due to Unsafe Array Modification in Multi-threaded Environment","modified":"2026-09-10T03:50:10.222682918Z","packages":[{"ecosystem":"Go","name":"github.com/argoproj/argo-cd","purl":"pkg:golang/github.com/argoproj/argo-cd","ranges":["<=1.8.7"],"fixed":[]},{"ecosystem":"Go","name":"github.com/argoproj/argo-cd/v2","purl":"pkg:golang/github.com/argoproj/argo-cd/v2","ranges":["<2.8.13"],"fixed":["2.8.13"]},{"ecosystem":"Go","name":"github.com/argoproj/argo-cd/v2","purl":"pkg:golang/github.com/argoproj/argo-cd/v2","ranges":[">=2.9.0 <2.9.9"],"fixed":["2.9.9"]},{"ecosystem":"Go","name":"github.com/argoproj/argo-cd/v2","purl":"pkg:golang/github.com/argoproj/argo-cd/v2","ranges":[">=2.10.0 <2.10.4"],"fixed":["2.10.4"]}]},{"id":"GO-2024-2654","url":"https://osv.dev/vulnerability/GO-2024-2654","summary":"Denial of service in github.com/argoproj/argo-cd/v2","modified":"2024-05-20T16:03:47Z","packages":[{"ecosystem":"Go","name":"github.com/argoproj/argo-cd/v2","purl":"pkg:golang/github.com/argoproj/argo-cd/v2","ranges":["<2.8.13",">=2.9.0 <2.9.9",">=2.10.0 <2.10.4"],"fixed":["2.8.13","2.9.9","2.10.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}