Array index error in the SMBv2 protocol implementation in srv2.sys in Microsoft Windows Vista Gold, SP1, and SP2, Windows Server 2008 Gold and SP2, and Windows 7 RC allows remote attackers to execute arbitrary code or cause a denial of service (system crash) via an & (ampersand) character in a Process ID High header field in a NEGOTIATE PROTOCOL REQUEST packet, which triggers an attempted dereference of an out-of-bounds memory location, aka "SMBv2 Negotiation Vulnerability." NOTE: some of these details are obtained from third party information.
CVE-2009-3103
NONECVSS 0.09.0▲Weaponized
EchelonGraph scoreLOW confidence
Score elevated to 9.0 because EPSS predicts 93% probability of exploitation within the next 30 days (top 0.2% of all CVEs). Confidence: see factors.
Triggered by: EPSS exploit prediction ≥85%
Sources: epss
0.0
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
- High exploitation likelihood — EPSS 90%
CISA-KEV: Not listedEPSS: 90%CVSS: —Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- —
- EG Score
- 9.0(low)
- EPSS
- 99.8%
- KEV
- Not listed
Published
September 8, 2009
Last Modified
April 23, 2026
References (36)
- secure@microsofthttp://archives.neohapsis.com/archives/fulldisclosure/2009-09/0090.html
- secure@microsofthttp://blog.48bits.com/?p=510
- secure@microsofthttp://g-laurent.blogspot.com/2009/09/windows-vista7-smb20-negotiate-protocol.html
- secure@microsofthttp://isc.sans.org/diary.html?storyid=7093
- secure@microsofthttp://osvdb.org/57799
- secure@microsofthttp://secunia.com/advisories/36623
- secure@microsofthttp://www.exploit-db.com/exploits/9594
- secure@microsofthttp://www.kb.cert.org/vuls/id/135940
- secure@microsofthttp://www.microsoft.com/technet/security/advisory/975497.mspx
- secure@microsofthttp://www.reversemode.com/index.php?option=com_content&task=view&id=64&Itemid=1
- secure@microsofthttp://www.securityfocus.com/archive/1/506300/100/0/threaded
- secure@microsofthttp://www.securityfocus.com/archive/1/506327/100/0/threaded
- secure@microsofthttp://www.securityfocus.com/bid/36299
- secure@microsofthttp://www.securitytracker.com/id?1022848
- secure@microsofthttp://www.us-cert.gov/cas/techalerts/TA09-286A.html
Data Freshness Timeline
(refreshed 1× in last 7d / 18× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-01 15:02 UTCEPSS rescore
- 2026-06-29 14:02 UTCEPSS rescore
- 2026-06-29 14:02 UTCEPSS rescore
- 2026-06-28 04:52 UTCEPSS rescore
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- 2026-06-25 13:46 UTCEPSS rescore
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- 2026-06-24 14:02 UTCEPSS rescore
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- 2026-06-23 21:29 UTCEPSS rescore
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- 2026-06-16 17:49 UTCEPSS rescore
- 2026-06-16 17:49 UTCEPSS rescore
- 2026-06-15 17:44 UTCEPSS rescore
- 2026-06-14 23:14 UTCEPSS rescore
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- 2026-06-10 22:14 UTCEPSS rescore
- 2026-06-08 14:13 UTCEPSS rescore
- 2026-06-05 22:44 UTCEPSS rescore
- 2026-06-05 22:44 UTCEPSS rescore
- 2026-05-31 00:13 UTCEPSS rescore
- 2026-05-31 00:13 UTCEPSS rescore
- 2026-05-30 15:25 UTCEG score recompute
- 2026-05-30 15:25 UTCGHSA enrichment
- 2026-05-29 13:40 UTCEPSS rescore
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- 2026-05-28 13:42 UTCEPSS rescore
- 2026-05-28 13:42 UTCEPSS rescore
- 2026-05-28 13:42 UTCEPSS rescore
- 2026-05-27 13:38 UTCEPSS rescore
- 2026-05-27 13:38 UTCEPSS rescore
- 2026-05-20 22:37 UTCEPSS rescore
- 2026-05-20 22:37 UTCEPSS rescore
- 2026-05-18 21:29 UTCEPSS rescore
Publicly available exploits
(10 references)Working exploit code is in the public domain (3 Metasploit modules) (1 GitHub PoC) (6 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.
- GitHub PoCSic4rio/CVE-2009-3103---srv2.sys-SMB-Code-Execution-Python-MS09-050-First seen Dec 20, 2023
Microsoft Windows - 'srv2.sys' SMB Code Execution (Python) (MS09-050)
Open source ↗ - Exploit-DBEDB-40280First seen Feb 26, 2016
Microsoft Windows - 'srv2.sys' SMB Code Execution (Python) (MS09-050)
Open source ↗ - Exploit-DBEDB-14674First seen Aug 17, 2010
Microsoft Windows - 'srv2.sys' SMB Negotiate ProcessID Function Table Dereference (MS09-050)
Open source ↗ - Exploit-DBEDB-16363✓ verifiedFirst seen Jul 3, 2010
Microsoft Windows - 'srv2.sys' SMB Negotiate ProcessID Function Table Dereference (MS09-050) (Metasploit)
Open source ↗ - Exploit-DBEDB-12524✓ verifiedFirst seen May 7, 2010
Microsoft Windows - SMB2 Negotiate Protocol '0x72' Response Denial of Service
Open source ↗ - Exploit-DBEDB-10005✓ verifiedFirst seen Nov 11, 2009
Microsoft Windows 7/2008 R2 - Remote Kernel Crash
Open source ↗ - Exploit-DBEDB-9594✓ verifiedFirst seen Sep 9, 2009
Microsoft Windows Vista/7 - SMB2.0 Negotiate Protocol Request Remote Blue Screen of Death (MS07-063)
Open source ↗ - Metasploitexploit/windows/smb/ms09_050_smb2_negotiate_func_index✓ verifiedFirst seen Sep 7, 2009
MS09-050 Microsoft SRV2.SYS SMB Negotiate ProcessID Function Table Dereference
Open source ↗ - Metasploitauxiliary/dos/windows/smb/ms09_050_smb2_negotiate_pidhigh✓ verifiedFirst seen Jan 1, 2009
Microsoft SRV2.SYS SMB Negotiate ProcessID Function Table Dereference
Open source ↗ - Metasploitauxiliary/dos/windows/smb/ms09_050_smb2_session_logoff✓ verifiedFirst seen Jan 1, 2009
Microsoft SRV2.SYS SMB2 Logoff Remote Kernel NULL Pointer Dereference
Open source ↗
Frequently asked(4)
What is CVE-2009-3103?
CVE-2009-3103 is a none vulnerability published on September 8, 2009. Array index error in the SMBv2 protocol implementation in srv2.sys in Microsoft Windows Vista Gold, SP1, and SP2, Windows Server 2008 Gold and SP2, and Windows 7 RC allows remote attackers to execute arbitrary code or cause a denial of service (system crash) via an & (ampersand) character in a…
When was CVE-2009-3103 disclosed?
CVE-2009-3103 was first published in the National Vulnerability Database on September 8, 2009, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2009-3103 actively exploited?
CVE-2009-3103 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2009-3103?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-3103, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
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