Is CVE-2023-28821 in the CISA KEV catalog?

No. CVE-2023-28821 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-28821?

CVE-2023-28821 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2023-28821?

CVE-2023-28821 has an EPSS score of 0.73% (50th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-28821?

Upgrade concrete cms to 9.1.0 or later.

CVE & CISA-KEV Catalog

CVE-2023-28821

MEDIUM

5.3

CVSS v3

NVD

Description

Concrete CMS (previously concrete5) before 9.1 did not have a rate limit for password resets.

CWE-640

How to fix

Remediation Available

concrete cmsNVD

Affected:< 9.1.0Fixed in:9.1.0CVE-2023-28821derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.73%probability of exploitation in 30 days

50thpercentile

Moderate risk: more likely to be exploited than 50% of all known CVEs.

References

Vendor Advisory1

concretecms.org

Release Notes1

github.com

Related Vulnerabilities

Other CWE-640 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-18818	Critical	9.8	98%	-	-
CVE-2023-7028	Critical	10.0	95%	KEV	Fix
CVE-2017-7615	High	8.8	91%	-	-
CVE-2024-2862	Critical	9.1	51%	-	-
CVE-2019-19844	Critical	9.8	35%	-	Fix
CVE-2025-6216	Critical	9.8	29%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-01-30.