How severe is CVE-1999-0682?

CVE-1999-0682 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-1999-0682 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 26% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-0682?

CVE-1999-0682 primarily affects Microsoft Exchange Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-0682?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-1999-0682 published?

CVE-1999-0682 was published on 1999-08-06 and last updated on 2026-06-16.

CVE-1999-0682

CVE-1999-0682 is a medium-severity vulnerability in Microsoft Exchange Server with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 26% places it in the 98th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 26% (98th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Exchange Server
Published: 1999-08-06
Last modified: 2026-06-16

Description

Microsoft Exchange 5.5 allows a remote attacker to relay email (i.e. spam) using encapsulated SMTP addresses, even if the anti-relaying features are enabled.

Frequently asked questions

What is CVE-1999-0682?: Microsoft Exchange 5.5 allows a remote attacker to relay email (i.e. spam) using encapsulated SMTP addresses, even if the anti-relaying features are enabled.
How severe is CVE-1999-0682?: CVE-1999-0682 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-1999-0682 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 26% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0682?: CVE-1999-0682 primarily affects Microsoft Exchange Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-0682?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-0682 published?: CVE-1999-0682 was published on 1999-08-06 and last updated on 2026-06-16.

References

Affected products (3)

cpe:2.3:a:microsoft:exchange_server:5.5:-:*:*:*:*:*:*
cpe:2.3:a:microsoft:exchange_server:5.5:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:exchange_server:5.5:sp2:*:*:*:*:*:*

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