CVE-2001-0851

Openlinux Server vulnerability

CVSS

5.0

EPSS

3.1%

EPSS pct

86th

Exploited

No known

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.

Affected vendor

Caldera

Affected product

Openlinux Server

CVSS vector

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

Published

2001-12-06

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to partial impact to confidentiality.

Its EPSS score of 3.1% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 86% of all scored CVEs.

Check your external exposure to CVE-2001-0851

Confirm whether Caldera Openlinux Server is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2001-0851.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2001-0851

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2001-0851 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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