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Vulnerability record · CVE-2008-5911 · published 20 January 2009

CVE-2008-5911: Realnetworks helix server memory buffer overflow vulnerability

RRealnetworks · Helix Server

Multiple buffer overflows in RealNetworks Helix Server and Helix Mobile Server 11.x before 11.1.8 and 12.x before 12.0.1 allow remote attackers to (1) cause a denial of service via three crafted RTSP SETUP commands, or execute arbitrary code via (2) an NTLM authentication request with malformed base64-encoded data, (3) an RTSP DESCRIBE command, or (4) a DataConvertBuffer request.

10.0 CVSS 2.0 High EPSS 6.2% · top 6.7% CWE-119 · Memory buffer overflow
10.0CVSS 2.0 base score
6.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
14References
16 Jun 2026Last modified by NVD

Description

Multiple buffer overflows in RealNetworks Helix Server and Helix Mobile Server 11.x before 11.1.8 and 12.x before 12.0.1 allow remote attackers to (1) cause a denial of service via three crafted RTSP SETUP commands, or execute arbitrary code via (2) an NTLM authentication request with malformed base64-encoded data, (3) an RTSP DESCRIBE command, or (4) a DataConvertBuffer request.

AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://docs.real.com/docs/security/SecurityUpdate121508HS.pdf Vendor Advisory
http://secunia.com/advisories/33360 Vendor Advisory
http://www.securitytracker.com/id?1021498
http://www.securitytracker.com/id?1021499
http://www.securitytracker.com/id?1021500
http://www.securitytracker.com/id?1021501
http://www.vupen.com/english/advisories/2008/3521
http://docs.real.com/docs/security/SecurityUpdate121508HS.pdf Vendor Advisory
http://secunia.com/advisories/33360 Vendor Advisory
http://www.securitytracker.com/id?1021498
http://www.securitytracker.com/id?1021499
http://www.securitytracker.com/id?1021500
http://www.securitytracker.com/id?1021501
http://www.vupen.com/english/advisories/2008/3521

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2010-4235Realnetworks helix server vulnerabilityFormat string vulnerability in RealNetworks Helix Server 12.x, 13.x, and 14.x before 14.2, and Helix Mobile Server 12.x, 13.x, and 14.x before 14.2, …EPSS 4.1%10.0CVE-2010-1318RealNetworks Helix Server AgentX++ stack buffer overflowA stack-based buffer overflow exists in the AgentX::receive_agentx function of AgentX++ 1.4.16, which is used in RealNetworks Helix Server and Helix …EPSS 58%analysed10.0CVE-2010-1319Realnetworks helix mobile server vulnerabilityInteger overflow in the AgentX::receive_agentx function in AgentX++ 1.4.16, as used in RealNetworks Helix Server and Helix Mobile Server 11.x through…EPSS 5.1%10.0CVE-2006-6026Realnetworks helix dna server memory buffer overflow vulnerabilityHeap-based buffer overflow in Real Networks Helix Server and Helix Mobile Server before 11.1.3, and Helix DNA Server 11.0 and 11.1, allows remote att…EPSS 11%9.3CVE-2010-4596Realnetworks helix server memory buffer overflow vulnerabilityStack-based buffer overflow in RealNetworks Helix Server 12.x, 13.x, and 14.x before 14.2, and Helix Mobile Server 12.x, 13.x, and 14.x before 14.2, …EPSS 5.0%7.5CVE-2012-0942Realnetworks helix server memory buffer overflow vulnerabilityBuffer overflow in rn5auth.dll in RealNetworks Helix Server and Helix Mobile Server 14.x before 14.3.x allows remote attackers to execute arbitrary c…EPSS 4.1%7.5CVE-2010-1317Realnetworks helix dna server memory buffer overflow vulnerabilityHeap-based buffer overflow in the NTLM authentication functionality in RealNetworks Helix Server and Helix Mobile Server 11.x, 12.x, and 13.x allows …EPSS 1.6%6.8CVE-2012-1985Realnetworks helix server cross-site request forgery vulnerabilityCross-site request forgery (CSRF) vulnerability in RealNetworks Helix Server and Helix Mobile Server 14.x before 14.3.x allows remote attackers to hi…EPSS 0.97%

Source: NIST National Vulnerability Database (record CVE-2008-5911), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.