CVE-2002-2266: NetScreen ScreenOS 2.8 through 4.0, when forwarding H.323 or Netmeeting traffic, allows remote attackers to ca

Routine

MEDIUM 5.0DOWNGRADE

CVE-2002-2266 is a medium-severity flaw (CVSS 5.0) affecting screenos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NetScreen ScreenOS 2.8 through 4.0, when forwarding H.323 or Netmeeting traffic, allows remote attackers to cause a denial of service (firewall session table consumption) by establishing multiple half-open H.323 sessions, which are not cleaned up on garbage removal and do not time out for 36 hours.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
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: 2.8 · 3.0 · 3.1 · 4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.8

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.8 (Debian / Ubuntu)

apt-cache madison screenos sudo apt install screenos=<VERSION_BEFORE_2.8> sudo apt-mark hold screenos

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

dnf --showduplicates list screenos sudo dnf downgrade screenos-<VERSION_BEFORE_2.8> 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-2002-2266?

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

Is CVE-2002-2266 being exploited?

CVE-2002-2266 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-2002-2266 affect?

CVE-2002-2266 affects screenos. Severity is medium (CVSS 5.0). NetScreen ScreenOS 2.8 through 4.0, when forwarding H.323 or Netmeeting traffic, allows remote attackers to cause a denial of service (firewall session table consumption) by establishing multiple half-open H.323 sessions, which are not clea

How urgent is CVE-2002-2266?

Priority 36/100. No elevated risk signals yet.

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References

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