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Fencer Vulns
medium 6.5

CVE-2021-3557 json

A flaw was found in argocd.

published 2022-02-16 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26868

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits
0
none known

Summary

A flaw was found in argocd. Any unprivileged user is able to deploy argocd in their namespace and with the created ServiceAccount argocd-argocd-server, the unprivileged user is able to read all resources of the cluster including all secrets which might enable privilege escalations. The highest threat from this vulnerability is to data confidentiality.

Patch / fix

  • argoproj argo_cd 1.1.1

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-2021-3557 updated cvss 6.5

argocd: ServiceAccount argocd-argocd-server is able to read all resources of the whole cluster

  • Red Hat OpenShift GitOps 1.1 openshift-gitops-1/argocd-rhel8 v1.1.1-1, openshift-gitops-1/gitops-rhel8 v1.1.1-1, openshift-gitops-1/kam-delivery-rhel8 v1.1.1-1, openshift-gitops-1/applicationset-rhel8 v1.1.1-1, openshift-gitops-1/gitops-rhel8-operator v1.1.1-1, openshift-gitops-1/gitops-operator-bundle v1.1.1-1
    fixed: vendor fix RHSA-2021:2053

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

0.76% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:P/I:N/A:N

Affected products

  • n/a argocd

Classification

Weakness
  • CWE-732 Incorrect Permission Assignment for Critical Resource

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.