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01 Record

CVE-2021-40099

An issue was discovered in Concrete CMS through 8.5.5. Fetching the update json scheme over HTTP leads to remote code execution.

UnratedPUBLISHEDCNA: mitre
CNA base scoreUnratedNo CNA CVSS vector
View raw JSON

02 Description

An issue was discovered in Concrete CMS through 8.5.5. Fetching the update json scheme over HTTP leads to remote code execution.

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
2.07% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 81.3% of scored records. A rank, not a probability.
NVD base score
7.2 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2021-09-24 14:58Z5 YR AGO
Last updated
2024-08-04 02:27Z2 YR AGO
Reserved
2021-08-25
Assigning CNA
mitre
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
No CWE assigned
Data version
5.1
Document digest
0ba88a3828a128bbae5d8436e71140e511b2f6f8755bebe79262abc395cf29fe

05 Affected products

VendorProductVersionsPlatforms
concretecmsconcrete_cmsNot specified—

06 References