CVE-1999-0910

Commercial Internet System vulnerability

CVSS

5.0

EPSS

5.8%

EPSS pct

92th

Exploited

No known

Microsoft Site Server and Commercial Internet System (MCIS) do not set an expiration for a cookie, which could then be cached by a proxy and inadvertently used by a different user.

Affected vendor

Microsoft

Affected product

Commercial Internet System

CVSS vector

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

Published

1999-09-10

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 confidentiality.

Its EPSS score of 5.8% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 92% of all scored CVEs.

Check your external exposure to CVE-1999-0910

Confirm whether Microsoft Commercial Internet System is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-1999-0910.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-1999-0910

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-1999-0910 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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