Summary
generated automatically from NVD dataMicrosoft Exchange Server 5.0 and 5.5 contain a flaw in how they process malformed input received over NNTP and SMTP. A remote attacker can send specially malformed data over either protocol to trigger an application error, causing a denial of service. The issue is rated MEDIUM with a CVSS v2.0 score of 5.0, and it affects availability only, with no impact on confidentiality or integrity.
NVD description
Microsoft Exchange Server 5.5 and 5.0 does not properly handle (1) malformed NNTP data, or (2) malformed SMTP data, which allows remote attackers to cause a denial of service (application error).
EPSS · FIRST.org
13.2%probability of exploitation in the next 30 days
Higher than 96% of scored CVEs
EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-30, recomputed daily by FIRST.org.
CVSS v2.0 Score
Information
- Published
- 31 déc. 1999
- Updated
- 16 juin 2026
- Status
- Modified
- Source
- cve@mitre.org
Affected products
Bounds published by NVD: "< 8.4.27" means 8.4.27 is no longer vulnerable. The fixed release to install is in the vendor advisory.
Weaknesses (CWE)
References (2)
Similar CVEs
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