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    CVE-1999-1164

    Microsoft Outlook client allows remote attackers to cause a denial of service by sending multiple email messages with the same X-UIDL headers, which causes Outlook to hang.

    Published:Jun 25, 1999
    Last Modified:Apr 16, 2026
    EPS:Sep 12, 2001
    EPSS Score:0.06904
    CVSS Score:5

    Affected Products

    Vendor
    Microsoft
    Product
    Outlook
    Vendor
    Microsoft
    Product
    Outlook Express

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-69629 (CVSS 8.8) — Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a …
    CVE-2026-62882 (CVSS 4.3) — Insufficiently protected credentials in Microsoft Office Outlook allows an unauthorized attacker to perform sp…
    CVE-2026-70329 (CVSS 8.8) — Integer overflow or wraparound in Microsoft Office Outlook allows an unauthorized attacker to execute code ove…
    CVE-2026-42893 (CVSS 7.4) — Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an …
    CVE-2026-26133 (CVSS 7.1) — AI command injection in M365 Copilot allows an unauthorized attacker to disclose information over a network.…
    CVE-2026-21260 (CVSS 7.5) — Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized …
    CVE-2025-49699 (CVSS 7) — Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.…
    CVE-2025-47176 (CVSS 7.8) — '.../...//' in Microsoft Office Outlook allows an authorized attacker to execute code locally.…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High