CVE-1999-0661

What it is

A system is running a version of software that was replaced with a Trojan Horse at one of its distribution points, such as (1) TCP Wrappers 7.6, (2) util-linux 2.9g, (3) wuarchive ftpd (wuftpd) 2.2 and 2.1f, (4) IRC client (ircII) ircII 2.2.9, (5) OpenSSH 3.4p1, or (6) Sendmail 8.12.6.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.

Exploit odds

54.2% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 1999-01-01 05:00 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 1999-06-07 00:00 UTC ReservedThe CVE id was reserved by its CNA
3. 2026-06-16 21:48 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 54.2% in the next 30 days (EPSS).
• Severity: 10.0 HIGH (CVSS).
• Fix: none linked yet, which raises it.
• It meets the bar for Drop everything: critical, and exploited or very likely to be.

Details

Published

1999-01-01 05:00 UTC

Last modified

2026-06-16 21:48 UTC

Exploit probability

54.2% · EPSS, next 30 days

Record status

Modified

Attack profile CVSS 2.0 · 10.0

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

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-1999-0661.md and follow it. Check whether this project is affected by CVE-1999-0661. 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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