CVE-2021-22970Network attack vector

Private-network file reads via local IP import

Published Nov 19, 2021 · Updated Aug 3, 2024

Server-Side Request Forgery in Concrete CMS 8.5.6 and earlier and 9.0.0 lets remote authenticated users read local files via remote importing. The remote file upload interface accepts local IP destinations, causing server-side requests into private networks and permitting DNS-rebinding bypass of SSRF mitigation. Access requires an authenticated account able to use remote file importing; impact is limited to confidentiality and network pivoting, with no stated write or service-interruption capability.

CVSS severity3.5
Low
EPSS probability1.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-Side Request Forgery in Concrete CMS 8.5.6 and earlier and 9.0.0 lets remote authenticated users read local files via remote importing. The remote file upload interface accepts local IP destinations, causing server-side requests into private networks and permitting DNS-rebinding bypass of SSRF mitigation. Access requires an authenticated account able to use remote file importing; impact is limited to confidentiality and network pivoting, with no stated write or service-interruption capability.

The record

CVE
CVE-2021-22970
Published
Nov 19, 2021
Updated
Aug 3, 2024
Vendor
Concrete CMS
Product
Concrete CMS
Classifications
CWE-918, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Affected versions Concrete CMS (formerly concrete5) versions below 8.5.6 and 9.0.0. Fixed versions 9.0.1 and 8.5.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Concrete CMS · Concrete CMSversion=Affected versions Concrete CMS (formerly concrete5) versions below 8.5.6 and 9.0.0. Fixed versions 9.0.1 and 8.5.7

Published CVSS scores

3.5Concrete CMSCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N
7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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