How severe is CVE-2000-0339?

CVE-2000-0339 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2000-0339 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2000-0339?

CVE-2000-0339 affects Zonelabs Zonealarm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2000-0339?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2000-0339 published?

CVE-2000-0339 was published on 2000-04-24 and last updated on 2026-06-16.

CVE-2000-0339

CVE-2000-0339 is a high-severity vulnerability in Zonelabs Zonealarm with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 7% (94th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Zonelabs Zonealarm
Published: 2000-04-24
Last modified: 2026-06-16

Description

ZoneAlarm 2.1.10 and earlier does not filter UDP packets with a source port of 67, which allows remote attackers to bypass the firewall rules.

Frequently asked questions

What is CVE-2000-0339?: ZoneAlarm 2.1.10 and earlier does not filter UDP packets with a source port of 67, which allows remote attackers to bypass the firewall rules.
How severe is CVE-2000-0339?: CVE-2000-0339 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2000-0339 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2000-0339?: CVE-2000-0339 affects Zonelabs Zonealarm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2000-0339?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2000-0339 published?: CVE-2000-0339 was published on 2000-04-24 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:zonelabs:zonealarm:*:*:*:*:*:*:*:*

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