Ui
CVE-2021-33818
HIGH
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V2 - Validation and Business Logic Resource consumption limits
MITRE ATT&CK
1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available. |
| Exploit ScenarioDerived | A remote attacker could cause denial of service by exhausting system resources by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability. |
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Alert meAnalysisAI
An issue was discovered in UniFi Protect G3 FLEX Camera Version UVC.v4.30.0.67. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Implement rate limiting, set resource quotas, validate input sizes, use timeouts.
Affects your stack
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Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified as Uncontrolled Resource Consumption (CWE-400), which allows attackers to cause denial of service by exhausting system resources. An issue was discovered in UniFi Protect G3 FLEX Camera Version UVC.v4.30.0.67. Attackers can use slowhttptest tool to send incomplete HTTP request, which could make server keep waiting for the packet to finish the connection, until its resource exhausted. Then the web server is denial-of-service. Affected products include: Ui Camera G3 Flex Firmware.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
An issue was discovered in UniFi Protect G3 FLEX Camera Version UVC.v4.30.0.67. Attackers can use slowhttptest tool to send incomplete HTTP request, which could make server keep waiting for the packet to finish the connection, until its resource exhausted. Then the web server is denial-of-service.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)NVD
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Ubiquiti Networks UniFi Dream Machine Pro v7.2.95 allows attackers to bypass domain restrictions via crafted packets. Ra
A vulnerability, found in EdgeRouters Version 2.0.9-hotfix.5 and earlier and UniFi Security Gateways (USG) Version 4.4.5
A weakness has been identified in Ubiquiti EdgeRouter X up to 2.0.9-hotfix.6. Rated high severity (CVSS 7.3), this vulne
A security flaw has been discovered in Ubiquiti EdgeRouter X up to 2.0.9-hotfix.6. Rated high severity (CVSS 7.3), this
A flaw has been found in Ubiquiti EdgeRouter X up to 2.0.9-hotfix.6. Rated high severity (CVSS 7.3), this vulnerability
A vulnerability was detected in Ubiquiti EdgeRouter X up to 2.0.9-hotfix.6. Rated high severity (CVSS 7.3), this vulnera
A security vulnerability has been detected in Ubiquiti EdgeRouter X up to 2.0.9-hotfix.6. Rated high severity (CVSS 7.3)
A vulnerability was identified in Ubiquiti EdgeRouter X up to 2.0.9-hotfix.6. Rated high severity (CVSS 7.3), this vulne
Ubiquiti UniFi Video before 3.8.0 for Windows uses weak permissions for the installation directory, which allows local u
A vulnerability classified as critical has been found in Ubiquiti EdgeRouter X up to 2.0.9-hotfix.6. Rated high severity
Exploit-DB