{"cve":"CVE-2007-4321","nvd":{"published":"2007-08-14T00:17:00.000","modified":"2026-06-16T22:43:48.533","status":"Modified","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_v4":null,"cvss_v3":null,"cwes":[],"references":["http://bugs.gentoo.org/show_bug.cgi?id=181214","http://osvdb.org/42484","http://secunia.com/advisories/23237","http://secunia.com/advisories/28374","http://security.gentoo.org/glsa/glsa-200707-13.xml"],"products":["fail2ban:fail2ban"],"source":"nvd","synced_at":"2026-10-19T19:48:28.501292361+00:00"},"epss":{"cve":"CVE-2007-4321","score":0.05748,"percentile":0.93067,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}