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Fencer Vulns
medium 6.5

CVE-2021-37914 json

Workflow re-write vulnerability using input parameter

published 2021-08-02 5 y ago modified 2026-06-17 4 mo ago also BIT-argo-workflows-2021-37914 , EUVD-2021-1738 , GHSA-h563-xh25-x54q , GO-2022-0928

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 61%
public exploits
0
none known

Summary

In Argo Workflows through 3.1.3, if EXPRESSION_TEMPLATES is enabled and untrusted users are allowed to specify input parameters when running workflows, an attacker may be able to disrupt a workflow because expression template output is evaluated.

Patch / fix

  • go github.com/argoproj/argo-workflows/v3 3.1.6
  • bitnami argo-workflows 3.1.4

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-2021-37914 updated cvss 2.6

argo-workflows: specific configuration allows for a DoS

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present “Set EXPRESSION_TEMPLATES=false for the workflow controller”

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

0.96% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/argoproj/argo-workflows/pull/6442 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/argoproj/argo-workflows/issues/6441 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:N/I:P/A:P
OSV 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Affected packages

ecosystem package affected fixed in
go github.com/argoproj/argo-workflows/v3
>=3.1.0, <3.1.6
3.1.6
bitnami argo-workflows
<3.1.4
3.1.4
go github.com/argoproj/argo-workflows
all versions
 no fix listed
go github.com/argoproj/argo-workflows/v2
all versions
 no fix listed

Classification

Weakness
  • CWE-20 Improper Input Validation

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.