Buffer overflow in Microsoft Exchange Server

CVE-1999-0385

The LDAP bind function in Exchange 5.5 has a buffer overflow that allows a remote attacker to conduct a denial of service or execute commands.

Vulnerability class: Buffer Overflow

Published 1998-12-01 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 10.0 (High). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.182 (97.1th percentile), scored 2026-09-30.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.182 · newest: 0.182 · change: 0.000

Affected products

Microsoft Exchange Server — versions 5.5

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-009 (vendor-advisory, Patch, Vendor Advisory)