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.

Published: 2001-10-08 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2001-1431 is rated Moderate Risk (43.9/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.30%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2001-1431

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.75% 1.30% +0.55%
2 2025-12-24 0.45% 0.75% +0.30%
3 2023-07-14 — 0.45% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2001-1431

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2001-1431

Affected software / configurations for CVE-2001-1431

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

References for CVE-2001-1431

cvelogic Threat Intelligence