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Vulnerability record · CVE-2001-1431 · published 8 October 2001

CVE-2001-1431: Checkpoint firewall-1 vulnerability

Checkpoint · Firewall 1

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.

5.0 CVSS 2.0 Medium EPSS 1.3% · top 30.5%
5.0CVSS 2.0 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
4References
16 Jun 2026Last modified by NVD

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.

AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.kb.cert.org/vuls/id/258731 US Government Resource
https://exchange.xforce.ibmcloud.com/vulnerabilities/8293
http://www.kb.cert.org/vuls/id/258731 US Government Resource
https://exchange.xforce.ibmcloud.com/vulnerabilities/8293

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2004-0469Checkpoint firewall-1 vulnerabilityBuffer overflow in the ISAKMP functionality for Check Point VPN-1 and FireWall-1 NG products, before VPN-1/FireWall-1 R55 HFA-03, R54 HFA-410 and NG …EPSS 5.0%10.0CVE-2004-0039Checkpoint firewall-1 vulnerabilityMultiple format string vulnerabilities in HTTP Application Intelligence (AI) component in Check Point Firewall-1 NG-AI R55 and R54, and Check Point F…EPSS 9.3%10.0CVE-2004-0040Checkpoint firewall-1 vulnerabilityStack-based buffer overflow in Check Point VPN-1 Server 4.1 through 4.1 SP6 and Check Point SecuRemote/SecureClient 4.1 through 4.1 build 4200 allows…EPSS 7.6%9.3CVE-2011-1827Checkpoint connectra ngx vulnerabilityMultiple unspecified vulnerabilities in Check Point SSL Network Extender (SNX), SecureWorkSpace, and Endpoint Security On-Demand, as distributed by S…EPSS 4.5%7.8CVE-2005-3673Checkpoint check point vulnerabilityThe Internet Key Exchange version 1 (IKEv1) implementation in Check Point products allows remote attackers to cause a denial of service via certain c…EPSS 4.9%7.8CVE-2004-2679Checkpoint firewall-1 vulnerabilityCheck Point Firewall-1 4.1 up to NG AI R55 allows remote attackers to obtain potentially sensitive information by sending an Internet Key Exchange (I…EPSS 1.5%7.5CVE-2004-0079Cisco firewall services module null pointer dereference vulnerabilityThe do_change_cipher_spec function in OpenSSL 0.9.6c to 0.9.6k, and 0.9.7a to 0.9.7c, allows remote attackers to cause a denial of service (crash) vi…EPSS 9.5%7.5CVE-2004-0699Checkpoint firewall-1 vulnerabilityHeap-based buffer overflow in ASN.1 decoding library in Check Point VPN-1 products, when Aggressive Mode IKE is implemented, allows remote attackers …EPSS 5.9%

Source: NIST National Vulnerability Database (record CVE-2001-1431), CISA KEV, FIRST EPSS (scores of 2026-10-05). This page is refreshed as NVD updates the record.