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CVE-2021-22969

MEDIUM
5.3
CVSS Score
Published: November 19, 2021 at 06:08 PM UTC
Updated: June 17, 2026 at 03:38 AM UTC
1 product affected across 1 vendorConcrete CMS

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.9%

Description

Concrete CMS (formerly concrete5) versions below 8.5.7 has a SSRF mitigation bypass using DNS Rebind attack giving an attacker the ability to fetch cloud IAAS (ex AWS) IAM keys.To fix this Concrete CMS no longer allows downloads from the local network and specifies the validated IP when downloading rather than relying on DNS.Discoverer: Adrian Tiron from FORTBRIDGE ( https://www.fortbridge.co.uk/ )The Concrete CMS team gave this a CVSS 3.1 score of 3.5 AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N . Please note that Cloud IAAS provider mis-configurations are not Concrete CMS vulnerabilities. A mitigation for this vulnerability is to make sure that the IMDS configurations are according to a cloud provider's best practices.This fix is also in Concrete version 9.0.0

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Concrete CMS· Concretecms
95%
v ≤ 8.5.6
Affected range stops below 8.5.7, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://documentation.concretecms.org/developers/introduction/version-history/857-release-notes
x_refsource_MISCPermissions Required
Source: [email protected]
https://hackerone.com/reports/1369312

CVSS

5.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-918

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