CVE-2008-4250 - PatchNow

📋 Vulnerability Details

Data Source: CIRCL

Confidence: HIGH

Exploitation Method: DIRECT_NETWORK

CVE Published: 2008-10-23

Added to CISA KEV: 2026-05-20 6418 DAYS BETWEEN CVE AND KEV

🎯 Recommendations:

CRITICAL: Check for indicators of compromise - this vulnerability is in CISA KEV indicating active exploitation in the wild. Review logs, check for unauthorized access, verify system integrity
Apply Microsoft Security Bulletin MS08-067 patch immediately on any remaining unpatched systems
Block SMB ports 139/445 at network perimeter if not required for internet access
Scan network for vulnerable systems using tools like Nessus or Nmap NSE scripts
Monitor for unusual RPC traffic and failed authentication attempts
CRITICAL patch priority - this is a wormable vulnerability with active exploitation

🔍 Web Intelligence (Kagi · 2026-06-03)

CVE-2008-4250 is a critical vulnerability in the Microsoft Windows Server service, famously known as the "Server Service vulnerability" or the flaw behind the Conficker (also known as Downadup) worm ^[1]?t=1&cve_id=CVE-2008-4250?kagi_q=CVE-2008-4250+details+exploitation+threat+actors+impact+mitigation.

Overview and Impact

Impact: Successful exploitation allows a remote, unauthenticated attacker to execute arbitrary code on the target system with SYSTEM-level privileges ^[1] ^[4]. This gives the attacker full control over the affected machine, including the ability to install programs, view/change/delete data, or create new accounts with full user rights.
Affected Versions: The vulnerability affected a wide range of older Windows operating systems, including Windows 2000 SP4, Windows XP (SP2 and SP3), Windows Server 2003 (SP1 and SP2), Windows Vista (Gold and SP1), Windows Server 2008, and Windows 7 Pre-Beta ^[1].

Exploitation Details

Attack Method: The vulnerability is triggered by sending a specially crafted RPC request to the Server service, which causes a buffer overflow during path canonicalization ^[1].
Requirements: It is a network-based attack that does not require any user interaction or authorization privileges ^[4]. Because it is highly automatable, it was exceptionally dangerous for worm-like propagation.
Active Exploitation: The vulnerability was actively exploited in the wild shortly after its disclosure in October 2008, most notably by the Gimmiv.A malware and subsequently the massive Conficker worm ^[1]?t=1&cve_id=CVE-2008-4250?kagi_q=CVE-2008-4250+details+exploitation+threat+actors+impact+mitigation. It remains listed in CISA’s Known Exploited Vulnerabilities (KEV) Catalog due to its historical significance and the potential for legacy systems to remain unpatched ^[3].

Mitigation and Patch Status

Patch Status: Microsoft addressed this vulnerability in Security Bulletin MS08-067, released in October 2008 ^[2].
Mitigation: The primary mitigation is applying the security update provided by Microsoft. Additionally, firewall best practices—specifically blocking unsolicited inbound traffic to the Server service (typically over ports 139 and 445)—can help protect network resources from external attacks ^[2].

Sources

NVD - CVE-2008-4250
An official website of the United States government Here's how you know ... CVE-2008-4250 Detail. Description. The Server service in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP1 and SP2, Vista Gold and SP1, Server 2008, and 7 Pre-Beta allows remote attackers to execute arbitrary code…
Microsoft Security Bulletin MS08-067 - Critical
Mitigating Factors for Server Service Vulnerability - CVE-2008-4250. Mitigation refers to a setting, common configuration, or general best- ... Mitigating Factors for Server Service Vulnerability - CVE-2008-4250 Mitigation refers to a setting, common configuration, or general best-practice, existing…
Known Exploited Vulnerabilities Catalog | CISA
CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild. Organizations should use the KEV catalog as an input to their ...
CVE-2008-4250 vulnerability in Microsoft Products
CVE-2008-4250 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors in an automatable fashion. The potential impact…