How severe is CVE-1999-1556?

CVE-1999-1556 has a CVSS 2.0 base score of 7.2, rated high severity.

Is CVE-1999-1556 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-1556?

CVE-1999-1556 affects Microsoft Sql Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-1999-1556?

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-1999-1556 published?

CVE-1999-1556 was published on 1998-06-29 and last updated on 2026-06-16.

CVE-1999-1556

CVE-1999-1556 is a high-severity vulnerability in Microsoft Sql Server with a CVSS 2.0 base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.2)
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Sql Server
Published: 1998-06-29
Last modified: 2026-06-16

Description

Microsoft SQL Server 6.5 uses weak encryption for the password for the SQLExecutiveCmdExec account and stores it in an accessible portion of the registry, which could allow local users to gain privileges by reading and decrypting the CmdExecAccount value.

Frequently asked questions

What is CVE-1999-1556?: Microsoft SQL Server 6.5 uses weak encryption for the password for the SQLExecutiveCmdExec account and stores it in an accessible portion of the registry, which could allow local users to gain privileges by reading and decrypting the CmdExecAccount value.
How severe is CVE-1999-1556?: CVE-1999-1556 has a CVSS 2.0 base score of 7.2, rated high severity.
Is CVE-1999-1556 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1556?: CVE-1999-1556 affects Microsoft Sql Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-1999-1556?: 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-1999-1556 published?: CVE-1999-1556 was published on 1998-06-29 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:microsoft:sql_server:6.5:*:*:*:*:*:*:*

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