CVE-1999-1537

Internet Information Server vulnerability

CVSS

5.0

EPSS

8.5%

EPSS pct

94th

Exploited

No known

IIS 3.x and 4.x does not distinguish between pages requiring encryption and those that do not, which allows remote attackers to cause a denial of service (resource exhaustion) via SSL requests to the HTTPS port for normally unencrypted files, which will cause IIS to perform extra work to send the files over SSL.

Affected vendor

Microsoft

Affected product

Internet Information Server

CVSS vector

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

Published

1999-07-07

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 8.5% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 94% of all scored CVEs.

Check your external exposure to CVE-1999-1537

Confirm whether Microsoft Internet Information Server is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-1999-1537.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-1999-1537

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-1999-1537 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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