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Not in CISA KEV
HIGH severity

CVE-2021-43464 — subrion

HIGH

CVE-2021-43464 is a high-severity (CVSS 8.8) remote code execution vulnerability in intelliants/subrion. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

Remote code execution in Subrion

Also known asGHSA-g54x-29xv-58h5
Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
1 known
Exploitation data as of Oct 31, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs73th percentile — riskier than 73% of all scored CVEsHighest risk
0.28%0.83%1.37%1.92%0.8%1.4%May 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘intelliants/subrion

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Subrion is an open source php content management system. A Remiote Code Execution (RCE) vulnerability exiss in Subrion CMS 4.2.1 via modified code in a background field; when the information is modified, the data in it will be executed through eval().

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🐘Packagistintelliants/subrionall versionsNo fix

Affected Products

1 product · 1 configurations
Application
subrion cmsintelliants
1 version
4.2.1
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

A Remiote Code Execution (RCE) vulnerability exiss in Subrion CMS 4.2.1 …

github.comNVDApr 2022

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for intelliants/subrion, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    The records we use list no patched version of intelliants/subrion for CVE-2021-43464. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

Subrion is an open source php content management system. A Remiote Code Execution (RCE) vulnerability exiss in Subrion CMS 4.2.1 via modified code in a background field; when the information is modified, the data in it will be executed through eval().
O3 Security · Impact-Aware SCA

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CVE-2021-43464: subrion: Remote code execution