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Morris Worm: 30 Years Since Major Internet Attack

Morris Worm: 30 Years Since Major Internet Attack

First seen 17 Oct 2026, 16:47 UTC • •
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ThreatCluster AI
ThreatCluster •October 17, 2026 at 18:49 UTC
  • •The Morris worm infected approximately 6,000 computers within 24 hours of its release.
  • •It exploited vulnerabilities in Unix systems, particularly in sendmail and finger services.
  • •The incident led to the first felony conviction under the Computer Fraud and Abuse Act.

On November 2, 1988, the Morris worm was released from MIT, rapidly infecting around 6,000 of the 60,000 computers connected to the Internet at that time. The worm targeted specific versions of the Unix operating system, exploiting vulnerabilities in the sendmail program and the finger service. It caused significant disruptions at major institutions, including Harvard and NASA, but did not destroy files. The incident marked the first felony conviction under the Computer Fraud and Abuse Act in the U.S. The worm's propagation was notable for its speed and stealth, leading to a crawl in vital military and university functions. The attack highlighted the vulnerabilities in early Internet infrastructure, prompting discussions on cybersecurity practices. As of now, the worm is a historical case study in cybersecurity.

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Timeline

1988-11-02
Morris worm released
The worm was launched from MIT, quickly infecting thousands of computers across the Internet.
FBI
1988-11-03
Widespread infection reported
Within 24 hours, around 6,000 computers were impacted, causing significant slowdowns at major institutions.
FBI

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Common questions

What systems were affected by the Morris worm?
The worm primarily targeted VAX computers and SUN-3 workstations running specific versions of the Unix operating system.
What was the impact of the Morris worm?
It caused significant disruptions, slowing down vital functions at institutions like NASA and Harvard, but did not destroy any files.
What legal actions resulted from the Morris worm incident?
The incident led to the first felony conviction in the U.S. under the Computer Fraud and Abuse Act.