CVE-2009-0845

Kerberos vulnerability

CVSS

5.0

EPSS

5.6%

EPSS pct

92th

Exploited

No known

The spnego_gss_accept_sec_context function in lib/gssapi/spnego/spnego_mech.c in MIT Kerberos 5 (aka krb5) 1.5 through 1.6.3, when SPNEGO is used, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via invalid ContextFlags data in the reqFlags field in a negTokenInit token.

Affected vendor

Mit

Affected product

Kerberos

CVSS vector

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

Weakness type (CWE)

CWE-20 — Improper Input Validation

Published

2009-03-27

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 availability.

Its EPSS score of 5.6% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 92% of all scored CVEs.

Check your external exposure to CVE-2009-0845

Confirm whether Mit Kerberos is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2009-0845.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2009-0845

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2009-0845 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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