How severe is CVE-1999-0909?

CVE-1999-0909 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-1999-0909 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-0909?

CVE-1999-0909 primarily affects Microsoft Terminal Server. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-0909?

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

When was CVE-1999-0909 published?

CVE-1999-0909 was published on 1999-09-20 and last updated on 2026-06-16.

CVE-1999-0909

CVE-1999-0909 is a high-severity vulnerability in Microsoft Terminal Server with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 12% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-264.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 12% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Microsoft Terminal Server
Published: 1999-09-20
Last modified: 2026-06-16

Description

Multihomed Windows systems allow a remote attacker to bypass IP source routing restrictions via a malformed packet with IP options, aka the "Spoofed Route Pointer" vulnerability.

Frequently asked questions

What is CVE-1999-0909?: Multihomed Windows systems allow a remote attacker to bypass IP source routing restrictions via a malformed packet with IP options, aka the "Spoofed Route Pointer" vulnerability.
How severe is CVE-1999-0909?: CVE-1999-0909 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-1999-0909 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0909?: CVE-1999-0909 primarily affects Microsoft Terminal Server. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-0909?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-1999-0909 published?: CVE-1999-0909 was published on 1999-09-20 and last updated on 2026-06-16.

References

Affected products (10)

cpe:2.3:a:microsoft:terminal_server:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_95:0a:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_95:0b:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_98se:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp1:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp2:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp3:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp4:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp5:*:*:*:*:*:*

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