CVE-2021-22958
CRITICALconcrete5 <8.5.5 - Server-Side Request Forgery via Decimal IP Bypass
Title source: manualDescription
A Server-Side Request Forgery vulnerability was found in concrete5 < 8.5.5 that allowed a decimal notation encoded IP address to bypass the limitations in place for localhost allowing interaction with local services. Impact can vary depending on services exposed.CVSSv2.0 AV:A/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N
References (2)
Core 2
Core References
Issue Tracking, Permissions Required, Third Party Advisory x_refsource_misc
https://hackerone.com/reports/863221
Release Notes, Vendor Advisory x_refsource_misc
https://documentation.concretecms.org/developers/introduction/version-history/855-release-notes
Scores
CVSS v3
9.8
EPSS
0.0119
EPSS Percentile
63.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Details
CWE
CWE-918
Status
published
Products (2)
concrete5/concrete5
0 - 8.5.5Packagist
concretecms/concrete_cms
< 8.5.5
Published
Oct 07, 2021
Tracked Since
Feb 18, 2026