CVE-2001-0851

Linux kernel 2.0, 2.2 and 2.4 with syncookies enabled allows remote attackers to bypass firewall rules by brute force guessing the cookie.

Published: 2001-12-06 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2001-0851 is rated Moderate Risk (43.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.62%). 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-2001-0851

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 2025-03-30 0.69% 0.62% -0.06%
2 2025-03-29 0.62% 0.69% +0.06%
3 2025-03-17 — 0.62% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2001-0851

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-2001-0851

OS Trackers for CVE-2001-0851

vendor priority summary link
redhat high — https://access.redhat.com/security/cve/CVE-2001-0851

Affected software / configurations for CVE-2001-0851

Vendor Product Version Raw CPE
caldera openlinux_server 3.1 cpe:2.3:a:caldera:openlinux_server:3.1:*:*:*:*:*:*:*
caldera openlinux_workstation 3.1 cpe:2.3:a:caldera:openlinux_workstation:3.1:*:*:*:*:*:*:*
caldera openlinux 2.3 cpe:2.3:o:caldera:openlinux:2.3:*:*:*:*:*:*:*
caldera openlinux_edesktop 2.4 cpe:2.3:o:caldera:openlinux_edesktop:2.4:*:*:*:*:*:*:*
caldera openlinux_eserver 2.3.1 cpe:2.3:o:caldera:openlinux_eserver:2.3.1:*:*:*:*:*:*:*
linux linux_kernel 2.0 cpe:2.3:o:linux:linux_kernel:2.0:*:*:*:*:*:*:*
linux linux_kernel 2.2.0 cpe:2.3:o:linux:linux_kernel:2.2.0:*:*:*:*:*:*:*
linux linux_kernel 2.4.0 cpe:2.3:o:linux:linux_kernel:2.4.0:*:*:*:*:*:*:*
suse suse_linux 6.3 cpe:2.3:o:suse:suse_linux:6.3:*:*:*:*:*:*:*
suse suse_linux 6.4 cpe:2.3:o:suse:suse_linux:6.4:*:*:*:*:*:*:*
suse suse_linux 7.0 cpe:2.3:o:suse:suse_linux:7.0:*:*:*:*:*:*:*
suse suse_linux 7.1 cpe:2.3:o:suse:suse_linux:7.1:*:*:*:*:*:*:*
suse suse_linux 7.2 cpe:2.3:o:suse:suse_linux:7.2:*:*:*:*:*:*:*
suse suse_linux 7.3 cpe:2.3:o:suse:suse_linux:7.3:*:*:*:*:*:*:*

References for CVE-2001-0851

cvelogic Threat Intelligence