CVE-1999-1520: A configuration problem in the Ad Server Sample directory (AdSamples) in Microsoft Site Server 3.0 allows an a

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MEDIUM 5.0WATCHLISTDOWNGRADE

CVE-1999-1520 is a medium-severity flaw (CVSS 5.0) affecting site server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A configuration problem in the Ad Server Sample directory (AdSamples) in Microsoft Site Server 3.0 allows an attacker to obtain the SITE.CSC file, which exposes sensitive SQL database information.

Why this priority

EPSS top 4%: very likely to be exploited
Public exploit reference
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	11.7% (top 4%)
CISA exploited list	No
Published	1999-05-11
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: microsoft

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

1999-05-11 04:00 UTCPublished CVE record published
2026-06-16 21:50 UTCUpdated Record last modified

microsoft site server DOWNGRADE

Affected: 3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0

1. Check installed version

apt-cache policy site-server || rpm -q site-server || site-server --version

2. No fixed release: DOWNGRADE to a release before 3.0 (Debian / Ubuntu)

apt-cache madison site-server sudo apt install site-server=<VERSION_BEFORE_3.0> sudo apt-mark hold site-server

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list site-server sudo dnf downgrade site-server-<VERSION_BEFORE_3.0> sudo dnf versionlock add site-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Microsoft Site Server Commerce Edition 3.0 alpha - AdSamples Sensitive Information

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-1999-1520?

site server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-1999-1520 being exploited?

CVE-1999-1520 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-1999-1520 affect?

CVE-1999-1520 affects site server. Severity is medium (CVSS 5.0). A configuration problem in the Ad Server Sample directory (AdSamples) in Microsoft Site Server 3.0 allows an attacker to obtain the SITE.CSC file, which exposes sensitive SQL database information.

How urgent is CVE-1999-1520?

Priority 52/100. EPSS top 4%: very likely to be exploited; Public exploit reference; On your watchlist

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References

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