How severe is CVE-1999-0770?

CVE-1999-0770 has a CVSS 2.0 base score of 2.1, rated low severity.

Is CVE-1999-0770 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-0770?

CVE-1999-0770 primarily affects Checkpoint Firewall-1. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-0770?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-1999-0770 published?

CVE-1999-0770 was published on 1999-07-29 and last updated on 2026-06-16.

CVE-1999-0770

CVE-1999-0770 is a low-severity vulnerability in Checkpoint Firewall-1 with a CVSS 2.0 base score of 2.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Low (CVSS 2.0 base score 2.1)
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Checkpoint Firewall-1
Published: 1999-07-29
Last modified: 2026-06-16

Description

Firewall-1 sets a long timeout for connections that begin with ACK or other packets except SYN, allowing an attacker to conduct a denial of service via a large number of connection attempts to unresponsive systems.

Frequently asked questions

What is CVE-1999-0770?: Firewall-1 sets a long timeout for connections that begin with ACK or other packets except SYN, allowing an attacker to conduct a denial of service via a large number of connection attempts to unresponsive systems.
How severe is CVE-1999-0770?: CVE-1999-0770 has a CVSS 2.0 base score of 2.1, rated low severity.
Is CVE-1999-0770 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0770?: CVE-1999-0770 primarily affects Checkpoint Firewall-1. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-0770?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-0770 published?: CVE-1999-0770 was published on 1999-07-29 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:checkpoint:firewall-1:3.0:*:*:*:*:*:*:*
cpe:2.3:a:checkpoint:firewall-1:4.0:*:*:*:*:*:*:*

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