CVE-2021-27312 — cms
CRITICALCVE-2021-27312 is a critical-severity (CVSS 9.4) remote code execution vulnerability in gleez/cms. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.
Gleez Cms Server Side Request Forgery (SSRF) vulnerability
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA’s SSVC triage for CVE-2021-27312.
EPSS Exploitation Probability
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
gleez/cmsReal-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
Server Side Request Forgery (SSRF) vulnerability in Gleez Cms 1.2.0, allows remote attackers to execute arbitrary code and obtain sensitive information via modules/gleez/classes/request.php.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | gleez/cms | all versions | No fix |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for gleez/cms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
The records we use list no patched version of gleez/cms for CVE-2021-27312. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.
Mitigate without a patch
Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated.
Frequently Asked Questions
Is CVE-2021-27312 in your dependencies?
Find it across Packagist, including transitive dependencies.