How severe is CVE-2001-1431?

CVE-2001-1431 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2001-1431 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-1431?

CVE-2001-1431 primarily affects Checkpoint Firewall-1. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2001-1431?

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

When was CVE-2001-1431 published?

CVE-2001-1431 was published on 2001-10-08 and last updated on 2026-06-16.

CVE-2001-1431

CVE-2001-1431 is a medium-severity vulnerability in Checkpoint Firewall-1 with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 1% (67th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Checkpoint Firewall-1
Published: 2001-10-08
Last modified: 2026-06-16

Description

Nokia Firewall Appliances running IPSO 3.3 and VPN-1/FireWall-1 4.1 Service Pack 3, IPSO 3.4 and VPN-1/FireWall-1 4.1 Service Pack 4, and IPSO 3.4 or IPSO 3.4.1 and VPN-1/FireWall-1 4.1 Service Pack 5, when SYN Defender is configured in Active Gateway mode, does not properly rewrite the third packet of a TCP three-way handshake to use the NAT IP address, which allows remote attackers to gain sensitive information.

Frequently asked questions

What is CVE-2001-1431?: Nokia Firewall Appliances running IPSO 3.3 and VPN-1/FireWall-1 4.1 Service Pack 3, IPSO 3.4 and VPN-1/FireWall-1 4.1 Service Pack 4, and IPSO 3.4 or IPSO 3.4.1 and VPN-1/FireWall-1 4.1 Service Pack 5, when SYN Defender is configured in Active Gateway mode, does not properly rewrite the third packet of a TCP three-way handshake to use the NAT IP address, which allows remote attackers to gain sensitive information.
How severe is CVE-2001-1431?: CVE-2001-1431 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2001-1431 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-1431?: CVE-2001-1431 primarily affects Checkpoint Firewall-1. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2001-1431?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2001-1431 published?: CVE-2001-1431 was published on 2001-10-08 and last updated on 2026-06-16.

References

Affected products (8)

cpe:2.3:a:checkpoint:firewall-1:4.1:sp3:*:*:*:*:*:*
cpe:2.3:a:checkpoint:firewall-1:4.1:sp4:*:*:*:*:*:*
cpe:2.3:a:checkpoint:firewall-1:4.1:sp5:*:*:*:*:*:*
cpe:2.3:a:checkpoint:vpn-1:4.1:sp3:*:*:*:*:*:*
cpe:2.3:a:checkpoint:vpn-1:4.1:sp4:*:*:*:*:*:*
cpe:2.3:h:nokia:firewall_appliance:ipso_3.3:*:*:*:*:*:*:*
cpe:2.3:h:nokia:firewall_appliance:ipso_3.4:*:*:*:*:*:*:*
cpe:2.3:h:nokia:firewall_appliance:ipso_3.41:*:*:*:*:*:*:*

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