CVE-2003-0819

CRITICAL

Buffer overflow in the H.323 filter of Microsoft Internet Security and Acceleration Server 2000 allows remote attackers to execute arbitrary code in the Microsoft Firewall Service via certain H.323...

Affects 1 product across 1 vendor.

BCS7.96
CVSS 2.010.0
EPSS40.9%
Percentile99th
PatchPatched
CVSS Vector — Plain English Remotely exploitable over the network, low complexity.
CWE Weakness Definitions
CWE-119: Improper Restriction of Operations within Memory Buffer

Parent class for buffer-related vulnerabilities where operations exceed buffer boundaries.

Related Attack Patterns (CAPEC)
CAPEC-8 Buffer Overflow in an API Call
via CWE-119
CAPEC-9 Buffer Overflow in Local Command-Line Utilities
via CWE-119
CAPEC-10 Buffer Overflow via Environment Variables
via CWE-119
CAPEC-14 Client-side Injection-induced Buffer Overflow
via CWE-119
CAPEC-24 Filter Failure through Buffer Overflow
via CWE-119
Show all 12

Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.

◆ SAGE Intelligence — CITED Relevance Research Team

This vulnerability was disclosed in 2004. A critical vulnerability affects Microsoft systems (CVE-2003-0819). No public exploit code is currently available. Isolate affected systems if patching is not feasible.

BSID: BS-2004-GLOBAL-000447-C • Model: rule-based-v1 • Confidence: MEDIUM

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Frequently Asked Questions
What is CVE-2003-0819?
This vulnerability was disclosed in 2004. A critical vulnerability affects Microsoft systems (CVE-2003-0819). No public exploit code is currently available. Isolate affected systems if patching is not feasible.
What is the CVSS score for CVE-2003-0819?
CVE-2003-0819 has CVSS 10.0 (Critical). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C. EPSS: 40.9%.
Is CVE-2003-0819 actively exploited?
No confirmed active exploitation of CVE-2003-0819 as of 2026-05-30.
How do I remediate CVE-2003-0819?
Priority: MEDIUM. Advisory: http://www.cert.org/advisories/CA-2004-01.html PSIRT: [email protected]
What systems are affected by CVE-2003-0819?
CVE-2003-0819 affects: Microsoft.
Vulnerability Details
CVE IDCVE-2003-0819
BSIDBS-2004-GLOBAL-000447-C BreachSpider Global ID
CVSS VectorAV:N/AC:L/Au:N/C:C/I:C/A:C
Published2004-02-17
Last Modified2026-04-16
ICS Relevance15%
Weakness (CWE)
Improper Restriction of Operations within Memory Buffer
SourceNVD
Official Description

Buffer overflow in the H.323 filter of Microsoft Internet Security and Acceleration Server 2000 allows remote attackers to execute arbitrary code in the Microsoft Firewall Service via certain H.323 traffic, as demonstrated by the NISCC/OUSPG PROTOS test suite for the H.225 protocol.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

Vulnerability details: Buffer overflow in the H.323 filter of Microsoft Internet Security and Acceleration Server 2000 allows remote attackers to execute arbitrary code in the Microsoft Firewall Service via certain H.323 traffic, as demonstrated by the NISCC/OUSPG PROTOS test suite for the H.225 protocol. CVSS vector: AV:N/AC:L/Au:N/C:C/I:C/A:C.

Exploitation Likelihood: MEDIUM

Affected Products
VendorProductFixed Version
Microsoft Proxy Server —
Remediation
View Vendor Advisory →

Remediation Priority: MEDIUM

Vendor PSIRT: [email protected]
Threat Intelligence
● Threat Intelligence Validated: August 2026 | Threat Age: 8204 Days
CISA KEVNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
SAGE Enrichment Record — provenance & audit hash
Modelrule-based-v1
ConfidenceMEDIUM
Enriched At2026-05-24
SHA-512 Audit Hash027768c06d93a312e7476f97c0c1ec00af27527d91e7f23e5031176e9536983ab6c13bb54b949c0f1b6d4873d16606bc1bd25771fb9cb6a5c29f78d9c5c596fd
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