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5.0

Juniper NetScreen ScreenOS Web UI can crash from long username

CVE-2002-0891 · published 24 years ago
Summary

The web management page of NetScreen ScreenOS versions before 2.6.1r8 and certain 2.8.x and 3.0.x releases can stop working if an attacker sends an unusually long user name. This causes the device to become unresponsive, interrupting network security functions. Update the software to the latest version or apply the vendor's recommended patch to prevent the crash.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
juniper netscreen_screenos 2.5
2.5r1
2.5r2
2.5r6
2.6.1
2.6.1r1
2.6.1r2
2.6.1r3
2.6.1r4
2.6.1r5
2.7.1
2.7.1r1
11 more version ranges
cpe:2.3:o:juniper:netscreen_screenos:2.5:*:*:*:*:*:*:*
Original advisory text
The web interface (WebUI) of NetScreen ScreenOS before 2.6.1r8, and certain 2.8.x and 3.0.x versions before 3.0.3r1, allows remote attackers to cause a denial of service (crash) via a long user name.
The web interface (WebUI) of NetScreen ScreenOS before 2.6.1r8, and certain 2.8.x and 3.0.x versions before 3.0.3r1, allows remote attackers to cause a denial of service (crash) via a long user name.
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker partial control (estimated)
Severity
5.0 Medium
Exploitation
2% chance of attack within 30 days
Timeline
Published4 Oct 2002
Updated3 Nov 2026
First seen29 Sep 2026
Sources
CVE-2002-0891 · NVD
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