High 9.3Published Jan 25, 2010

CVE-2009-4247Stack-based buffer overflow in protocol/rtsp/rtspclnt.cpp in RealNetworks RealPlayer 10; RealPlayer 10.5 6.0.12.1040 through 6.0.12.1741; RealPlayer 11 11.0.x; RealPlayer SP 1.0.0 and 1.0.1; RealPlay…

Updated under an hour ago (Nov 2, 2026, 12:20 AM ET)

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Stack-based buffer overflow in protocol/rtsp/rtspclnt.cpp in RealNetworks RealPlayer 10; RealPlayer 10.5 6.0.12.1040 through 6.0.12.1741; RealPlayer 11 11.0.x; RealPlayer SP 1.0.0 and 1.0.1; RealPlayer Enterprise; Mac RealPlayer 10, 10.1, 11.0, and 11.0.1; Linux RealPlayer 10, 11.0.0, and 11.0.1; and Helix Player 10.x, 11.0.0, and 11.0.1 allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via an ASM RuleBook with a large number of rules, related to an "array overflow."

CVSS: 9.3 HIGH (v2.0, NVD)AV:N/AC:M/Au:N/C:C/I:C/A:C
Weakness (CWE): CWE-119
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 16, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

realnetworks realplayer realnetworks:realplayer	10.0; 10.5; 11.0; 11.0.1; 11.0.2; 11.0.3; 11.0.4; 11.0.5; and 7 more ranges	NVD
realnetworks realplayer_enterprise realnetworks:realplayer_enterprise	all versions	NVD
realnetworks realplayer_sp realnetworks:realplayer_sp	1.0.0; 1.0.1	NVD
realnetworks helix_player realnetworks:helix_player	10.0; 11.0.0; 11.0.1	NVD

References

References

http://lists.helixcommunity.org/pipermail/helix-client-dev/2009-August/008092.html
http://lists.helixcommunity.org/pipermail/protocol-cvs/2009-August/001943.html
http://secunia.com/advisories/38218	vendor-advisory
http://secunia.com/advisories/38450	vendor-advisory
http://securitytracker.com/id?1023489	patch
http://service.real.com/realplayer/security/01192010_player/en/	patch, vendor-advisory
http://www.redhat.com/support/errata/RHSA-2010-0094.html
http://www.securityfocus.com/bid/37880
http://www.vupen.com/english/advisories/2010/0178	patch, vendor-advisory
https://bugzilla.redhat.com/show_bug.cgi?id=561338
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.