CVE-2021-3583

A flaw was found in Ansible, where a user's controller is vulnerable to template injection. This issue can occur through facts used in the template if the user is trying to put templates in multi-line YAML strings and the facts being handled do not routinely include special template characters. This flaw allows attackers to perform command injection, which discloses sensitive information. The highest threat from this vulnerability is to confidentiality and integrity.

Published: 2021-09-22 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-3583 is rated Moderate Risk (47.6/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.85%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-3583

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.29% 0.85% +0.56%
2 2025-11-21 0.24% 0.29% +0.05%
3 2025-11-18 — 0.24% —

Full EPSS history (15 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-3583

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.1 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 1.8 5.2 [email protected]
3.6 2.0 LOW
AV:L/AC:L/Au:N/C:P/I:P/A:N Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 3.9 4.9 [email protected]

Weakness enumeration for CVE-2021-3583

GitHub Security Advisory for CVE-2021-3583

GHSA-2pfh-q76x-gwvm · Severity: high · Ecosystem: pip — Improper Input Validation and Command Injection in Ansible

OS Trackers for CVE-2021-3583

vendor priority summary link
debian not yet assigned CVE-2021-3583 not yet assigned priority: Debian including 2 source packages (ansible, ansible-core), 9 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 9. https://security-tracker.debian.org/tracker/CVE-2021-3583
redhat high — https://access.redhat.com/security/cve/CVE-2021-3583
suse medium — https://www.suse.com/security/cve/CVE-2021-3583/
ubuntu medium CVE-2021-3583 medium priority: Ubuntu including 3 source packages (ansible, ansible-base, ansible-core), 48 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 18, ignored 12, not-affected 9, released 5, needed 2, needs-triage 2. https://ubuntu.com/security/CVE-2021-3583

Affected software / configurations for CVE-2021-3583

Vendor Product Version Raw CPE
redhat ansible_automation_platform 1.2 cpe:2.3:a:redhat:ansible_automation_platform:1.2:*:*:*:*:*:*:*
redhat ansible_engine < 2.9.23 cpe:2.3:a:redhat:ansible_engine:*:*:*:*:*:*:*:*
redhat ansible_tower < 3.7.0 cpe:2.3:a:redhat:ansible_tower:*:*:*:*:*:*:*:*

References for CVE-2021-3583

cvelogic Threat Intelligence