Unauthenticated denial of service via long password
Published Mar 17, 2021 · Updated Jul 9, 2026
Denial of service in the FluxBB 1.5.11 login form allows remote attackers to exhaust server CPU and memory with a long password. The login path hashes an attacker-controlled password without first limiting its length, causing an extremely long value to consume excessive processor time and memory. No authentication or user interaction is required, and the reported consequence is service interruption rather than data disclosure or modification.
Summary
What happened
Denial of service in the FluxBB 1.5.11 login form allows remote attackers to exhaust server CPU and memory with a long password. The login path hashes an attacker-controlled password without first limiting its length, causing an extremely long value to consume excessive processor time and memory. No authentication or user interaction is required, and the reported consequence is service interruption rather than data disclosure or modification.
The record
- CVE
- CVE-2020-28873
- Published
- Mar 17, 2021
- Updated
- Jul 9, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-916, T1499.003
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 17, 2021CVE publishedPublication date reported by the CVE source.
- Jul 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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