CVE-2007-4323

CVE-2007-4323 is a medium-severity vulnerability in Denyhosts with a CVSS 2.0 base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Description

DenyHosts 2.6 does not properly parse sshd log files, which allows remote attackers to add arbitrary hosts to the /etc/hosts.deny file and cause a denial of service by adding arbitrary IP addresses to the sshd log file, as demonstrated by logging in via ssh with a client protocol version identification containing an IP address string, a different vector than CVE-2006-6301.

Frequently asked questions

What is CVE-2007-4323?
DenyHosts 2.6 does not properly parse sshd log files, which allows remote attackers to add arbitrary hosts to the /etc/hosts.deny file and cause a denial of service by adding arbitrary IP addresses to the sshd log file, as demonstrated by logging in via ssh with a client protocol version identification containing an IP address string, a different vector than CVE-2006-6301.
How severe is CVE-2007-4323?
CVE-2007-4323 has a CVSS 2.0 base score of 6.8, rated medium severity.
Is CVE-2007-4323 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-4323?
CVE-2007-4323 affects Denyhosts. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2007-4323?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2007-4323 published?
CVE-2007-4323 was published on 2007-08-14 and last updated on 2026-06-16.

References

Affected products (1)

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