CVE-2007-4321 json
fail2ban 0.8 and earlier does not properly parse sshd log files, which allows remote attackers to add arbitrary hosts to the /etc/hosts.den…
published 2007-08-14 19 y ago modified 2026-06-16 4 mo ago also EUVD-2007-4304
- cvss
- 6.8
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 5.7%
- EPSS 5.7% chance of exploitation in 30 days, percentile 93%
- public exploits
- 1
- Exploit-DB
Summary
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.
Patch / fix
- fail2ban Debian 14, Debian 13, Debian 12 0.8.0-4
debian advisories DEBIAN-CVE-2007-4321
Timeline
- First public exploit (EDB-30430)
- Published
Exploit prediction
5.75% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- EDB-30430 Fail2ban 0.8 - Remote Denial of Service dos, 2007-07-28
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
References
-
debian.org
/security/2008/dsa-1456
vendor-advisory
-
security.gentoo.org
/glsa/glsa-200707-13.xml
vendor-advisory
-
secunia.com
/advisories/23237
third-party-advisory
-
osvdb.org
/42484
vdb-entry
-
securityfocus.com
/bid/25117
vdb-entry
-
secunia.com
/advisories/28374
third-party-advisory
- bugs.gentoo.org /show_bug.cgi?id=181214
- ossec.net /en/attacking-loganalysis.html
Sources
- CVE List CVE-2007-4321
- NVD CVE-2007-4321
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.