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Vulnerability record · CVE-2000-0804 · published 14 November 2000

CVE-2000-0804: Checkpoint firewall-1 vulnerability

Checkpoint · Firewall 1

Check Point VPN-1/FireWall-1 4.1 and earlier allows remote attackers to bypass the directionality check via fragmented TCP connection requests or reopening closed TCP connection requests, aka "One-way Connection Enforcement Bypass."

7.5 CVSS 2.0 High EPSS 1.7% · top 24.1%
7.5CVSS 2.0 base score
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
16 Jun 2026Last modified by NVD

Description

Check Point VPN-1/FireWall-1 4.1 and earlier allows remote attackers to bypass the directionality check via fragmented TCP connection requests or reopening closed TCP connection requests, aka "One-way Connection Enforcement Bypass."

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

Affected products

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

References

LinkTags
http://www.checkpoint.com/techsupport/alerts/list_vun.html#One-way_Connection
http://www.osvdb.org/4419
https://exchange.xforce.ibmcloud.com/vulnerabilities/5468
http://www.checkpoint.com/techsupport/alerts/list_vun.html#One-way_Connection
http://www.osvdb.org/4419
https://exchange.xforce.ibmcloud.com/vulnerabilities/5468

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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%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%7.5CVE-2002-0428Checkpoint check point vpn vulnerabilityCheck Point FireWall-1 SecuRemote/SecuClient 4.0 and 4.1 allows clients to bypass the "authentication timeout" by modifying the to_expire or expire v…EPSS 1.6%

Source: NIST National Vulnerability Database (record CVE-2000-0804), CISA KEV, FIRST EPSS (scores of 2026-10-04). This page is refreshed as NVD updates the record.