CVE-2002-2234: NetScreen ScreenOS before 4.0.1 allows remote attackers to bypass the Malicious-URL blocking feature by splitt

Routine

MEDIUM 4.3DOWNGRADE

CVE-2002-2234 is a medium-severity flaw (CVSS 4.3) affecting screenos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NetScreen ScreenOS before 4.0.1 allows remote attackers to bypass the Malicious-URL blocking feature by splitting the URL into fragmented IP requests.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-16
Published	2002-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: netscreen

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2002-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:00 UTCUpdated Record last modified

netscreen screenos DOWNGRADE

Affected: 2.7.1 · 2.8 · 3.0 · 3.1 · 4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.7.1

1. Check installed version

apt-cache policy screenos || rpm -q screenos || screenos --version

2. No fixed release: DOWNGRADE to a release before 2.7.1 (Debian / Ubuntu)

apt-cache madison screenos sudo apt install screenos=<VERSION_BEFORE_2.7.1> sudo apt-mark hold screenos

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list screenos sudo dnf downgrade screenos-<VERSION_BEFORE_2.7.1> sudo dnf versionlock add screenos

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2002-2234?

screenos: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2002-2234 being exploited?

CVE-2002-2234 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2002-2234 affect?

CVE-2002-2234 affects screenos. Severity is medium (CVSS 4.3). NetScreen ScreenOS before 4.0.1 allows remote attackers to bypass the Malicious-URL blocking feature by splitting the URL into fragmented IP requests.

How urgent is CVE-2002-2234?

Priority 34/100. No elevated risk signals yet.

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References

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