Public exploit available
Public proof-of-concept or exploit code exists (ExploitDB / Metasploit / Nuclei).
CVE-2007-4321 — Improper Authentication in Fail2ban
Severity
6.8MEDIUMNVD
NVD4.0OSV5.0
EPSS
12.1%
top 6.17%
CISA KEV
Not in KEV
Exploit
PoC available
Public exploit / PoC exists
Affected products
Timeline
PublishedAug 14
Latest updateMay 2
Description
fail2ban 0.8 and earlier 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-2006-6302.
CVSS vector
AV:N/AC:M/C:P/I:P/A:PExploitability: 8.6 | Impact: 6.4