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CVE-2021-27312

24
FAUCET Score

CVE-2021-27312 is a critical Server-Side Request Forgery (SSRF) vulnerability in Gleez Cms version 1.2.0, specifically within the modules/gleez/classes/request.php file. This flaw allows unauthenticated remote attackers to execute arbitrary code, obtain sensitive information, and potentially impact system availability. With a CVSS score of 9.4, it represents a high-severity risk due to its network-based attack vector and low attack complexity. Despite its critical severity, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
1.2.0CPE matchmatch criteria
cpe:2.3:a:gleezcms:gleez_cms:1.2.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.4CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
5.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.03%
Probability of exploitation in next 30 days
EPSS Percentile
60.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0103 is in the 45th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

composerGHSA-7mxg-r76p-363gcritical

Gleez Cms Server Side Request Forgery (SSRF) vulnerability

Apr 3, 2024

References

gist.github.com / LioTree/8d10d123d31f50db05a25586e62a87ba
ExploitThird Party Advisory
github.com / gleez/cms/issues/805
Issue Tracking