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Vulnerability record · CVE-2009-2534 · published 20 July 2009

CVE-2009-2534: Realnetworks helix server improper input validation vulnerability

RRealnetworks · Helix Server

RealNetworks Helix Server and Helix Mobile Server before 13.0.0 allow remote attackers to cause a denial of service (daemon crash) via an RTSP SETUP request that (1) specifies the / URI or (2) lacks a / character in the URI.

5.0 CVSS 2.0 Medium EPSS 8.8% · top 5.0% CWE-20 · Improper input validation
5.0CVSS 2.0 base score
8.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
14References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

RealNetworks Helix Server and Helix Mobile Server before 13.0.0 allow remote attackers to cause a denial of service (daemon crash) via an RTSP SETUP request that (1) specifies the / URI or (2) lacks a / character in the URI.

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

Affected products

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

References

LinkTags
http://docs.real.com/docs/security/SecurityUpdate071409HS.pdf
http://osvdb.org/55982
http://www.coresecurity.com/content/real-helix-dna Exploit
http://www.exploit-db.com/exploits/9198
http://www.securityfocus.com/archive/1/505083/100/0/threaded
http://www.securityfocus.com/bid/35732
http://www.vupen.com/english/advisories/2009/1947
http://docs.real.com/docs/security/SecurityUpdate071409HS.pdf
http://osvdb.org/55982
http://www.coresecurity.com/content/real-helix-dna Exploit
http://www.exploit-db.com/exploits/9198
http://www.securityfocus.com/archive/1/505083/100/0/threaded
http://www.securityfocus.com/bid/35732
http://www.vupen.com/english/advisories/2009/1947

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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-2008-5911Realnetworks helix server memory buffer overflow vulnerabilityMultiple 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…EPSS 6.2%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%

Source: NIST National Vulnerability Database (record CVE-2009-2534), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.