VULNERABILITY INTELLIGENCE

CVE-2021-22958

CVSS score9.8 CRITICAL

EPSS probability1.23%

CISA KEVNot currently listed

Published2021-10-07

Last modified2026-06-17

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

Description

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

Weakness classification

support@hackerone.com: CWE-918
nvd@nist.gov: CWE-918

Primary references

support@hackerone.com — Release Notes, Vendor Advisory
support@hackerone.com — Issue Tracking, Permissions Required, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Release Notes, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Issue Tracking, Permissions Required, Third Party Advisory