THREATPORT/VULNERABILITY/CVE-2000-0390
HIGH SEVERITY

CVE-2000-0390

Cygnus Network Security vulnerability

CVSS
10.0
EPSS
4.1%
EPSS pct
90th
Exploited
No known
Buffer overflow in krb425_conv_principal function in Kerberos 5 allows remote attackers to gain root privileges.
Affected vendor
Cygnus
Affected product
Cygnus Network Security
CVSS vector
AV:N/AC:L/Au:N/C:C/I:C/A:C
Published
2000-05-16

Risk analysis

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

Its EPSS score of 4.1% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 90% of all scored CVEs.

Check your external exposure to CVE-2000-0390

  • Confirm whether Cygnus Cygnus Network Security is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2000-0390.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2000-0390

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2000-0390 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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