CVE-2001-1088: n/a vulnerability

CVE-2001-1088: Microsoft Outlook 8.5 and earlier, and Outlook Express 5 and earlier, with the "Automatically put people I...

Microsoft Outlook 8.5 and earlier, and Outlook Express 5 and earlier, with the "Automatically put people I reply to in my address book" option enabled, do not notify the user when the "Reply-To" address is different than the "From" address, which could allow an untrusted remote attacker to spoof legitimate addresses and intercept email from the client that is intended for another user.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 8, 2024, 04:44 UTC (UTC+00:00)

Security readout for executives and security teams

This legacy Microsoft Outlook and Outlook Express issue can cause replies meant for a trusted sender to be directed to a different Reply-To address without warning. If the auto-add-to-address-book option is enabled, a spoofed contact can be stored, creating a risk of misdirected future email and information exposure. Exposure appears limited to very old Outlook or Outlook Express clients with the named address-book option enabled. The provided sources do not identify affected server software, modern Outlook versions, or broader platform impact. Treat this as a legacy-client exposure issue. It is not marked actively exploited, but any remaining affected clients could misdirect sensitive correspondence. Prioritize discovery and retirement over emergency response unless legacy mail clients are still in production. Mitigation focus: Check Microsoft guidance referenced for this issue.; Disable automatic address-book population where these clients remain in use.; Replace legacy Outlook and Outlook Express clients where feasible..

Prepared: Jul 1, 2026, 06:34 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jun 25, 2002, 04:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

0Timeline events

0ADP providers

2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
outlook-address-book-spoofing(6655)CVE reference · vdb-entry, x_refsource_XF

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

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