CVE-1999-1132

Windows Nt vulnerability

CVSS

5.0

EPSS

18.3%

EPSS pct

97th

Exploited

No known

Windows NT 4.0 allows remote attackers to cause a denial of service (crash) via extra source routing data such as (1) a Routing Information Field (RIF) field with a hop count greater than 7, or (2) a list containing duplicate Token Ring IDs.

Affected vendor

Microsoft

Affected product

Windows Nt

CVSS vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Published

1999-12-31

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to partial impact to availability.

Its EPSS score of 18.3% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 97% of all scored CVEs.

Check your external exposure to CVE-1999-1132

Confirm whether Microsoft Windows Nt is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-1999-1132.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-1999-1132

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-1999-1132 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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