CVE-2001-1088

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

19.7% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2001-06-05 04:00 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 21:55 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 19.7% in the next 30 days (EPSS).
• Severity: 7.5 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2001-06-05 04:00 UTC

Last modified

2026-06-16 21:55 UTC

Exploit probability

19.7% · EPSS, next 30 days

Record status

Modified

Affected

• Microsoft Outlook 97
• Microsoft Outlook 98
• Microsoft Outlook 2000
• Microsoft Outlook Express 4.0
• Microsoft Outlook Express 4.5
• Microsoft Outlook Express 4.27.3110
• Microsoft Outlook Express 4.72.2106
• Microsoft Outlook Express 4.72.3120.0

Attack profile CVSS 2.0 · 7.5

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2001-1088.md and follow it. Check whether this project is affected by CVE-2001-1088. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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