How severe is CVE-2020-28873?

CVE-2020-28873 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-28873 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-28873?

CVE-2020-28873 affects Fluxbb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-28873?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-28873 published?

CVE-2020-28873 was published on 2021-03-17 and last updated on 2026-07-05.

CVE-2020-28873

CVE-2020-28873 is a high-severity vulnerability in Fluxbb with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-916.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-916
Affected product: Fluxbb
Published: 2021-03-17
Last modified: 2026-07-05

Description

Fluxbb 1.5.11 is affected by a denial of service (DoS) vulnerability by sending an extremely long password via the user login form. When a long password is sent, the password hashing process will result in CPU and memory exhaustion on the server.

Frequently asked questions

What is CVE-2020-28873?: Fluxbb 1.5.11 is affected by a denial of service (DoS) vulnerability by sending an extremely long password via the user login form. When a long password is sent, the password hashing process will result in CPU and memory exhaustion on the server.
How severe is CVE-2020-28873?: CVE-2020-28873 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-28873 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-28873?: CVE-2020-28873 affects Fluxbb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-28873?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-28873 published?: CVE-2020-28873 was published on 2021-03-17 and last updated on 2026-07-05.

References

Affected products (1)

cpe:2.3:a:fluxbb:fluxbb:1.5.11:*:*:*:*:*:*:*

More vulnerabilities in Fluxbb

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CVE-2021-43677 — Medium (CVSS 6.1): Fluxbb v1.4.12 is affected by a Cross Site Scripting (XSS) vulnerability.
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CVE-2025-44110 — Medium (CVSS 5.4): FluxBB 1.5.11 is vulnerable to Cross Site Scripting (XSS) in via the Forum Description Field in admin_forums.php.

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