How severe is CVE-2003-0819?

CVE-2003-0819 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2003-0819 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 41% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2003-0819?

CVE-2003-0819 primarily affects Microsoft Proxy Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2003-0819?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2003-0819 published?

CVE-2003-0819 was published on 2004-02-17 and last updated on 2026-06-16.

CVE-2003-0819

CVE-2003-0819 is a critical-severity vulnerability in Microsoft Proxy Server with a CVSS 2.0 base score of 10.0. Its EPSS exploit-prediction score of 41% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 41% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Microsoft Proxy Server
Published: 2004-02-17
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2003-0819?: 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.
How severe is CVE-2003-0819?: CVE-2003-0819 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2003-0819 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 41% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2003-0819?: CVE-2003-0819 primarily affects Microsoft Proxy Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2003-0819?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2003-0819 published?: CVE-2003-0819 was published on 2004-02-17 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:microsoft:proxy_server:2.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:proxy_server:2.0:sp1:*:*:*:*:*:*

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