CVE-2007-4321 EXPLOIT
6.8
MEDIUM · CVSS 2.0 · EPSS 5.7% (pctl 93)
Patch early
A public exploit exists.
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.
Scoring
| CVSS | 6.8 (MEDIUM, v2.0) |
|---|---|
| Vector | AV:N/AC:M/Au:N/C:P/I:P/A:P |
| EPSS | 5.75% — more likely to be exploited than 93% of all CVEs |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2007-08-14 |
| Last modified | 2026-06-16 |
Affected (1)
| Vendor | Product |
|---|---|
| fail2ban | fail2ban |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Fail2ban 0.8 - Remote Denial of Service | 2007-07-28 |
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
- http://www.debian.org/security/2008/dsa-1456
- http://www.ossec.net/en/attacking-loganalysis.html
- http://www.securityfocus.com/bid/25117
- 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
- http://www.debian.org/security/2008/dsa-1456
- http://www.ossec.net/en/attacking-loganalysis.html
- http://www.securityfocus.com/bid/25117
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