CVE-2007-4321
fail2ban 0.8 and earlier does not properly parse sshd log files, which allows remote attackers to add arbitrary hosts to the…
- 6.8MediumCVSS base score
- 5.7%Exploitation in 30 daysEPSS · top 6.8% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- 1Public exploitsMetasploit, Nuclei and Exploit-DB
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.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list an Exploit-DB entry for it.
Show the exploits1
Exploit-DB1 entry
- Fail2ban 0.8 - Remote Denial of Service (Exploit-DB entry) (opens in a new tab)
EDB-ID 30430dos, linuxpublished 28 Jul 2007Verified
Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from
Timeline
ID reserved
By mitre
- 1 day later
· 1 day later
Published
- 17 years later
· 17 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | Medium6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
- EPSS (exploitation in 30 days)
- 5.7% · top 6.8% of all CVEs (11 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.8.
Affected products
n/a
- affected n/a
References
References8
- DSA-1456 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- 23237 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- 42484 (opens in a new tab)vdb-entryx_refsource_OSVDBx_transferred
- 25117 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- 28374 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- http://bugs.gentoo.org/show_bug.cgi?id=181214 (opens in a new tab)x_refsource_MISCx_transferred
- GLSA-200707-13 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- http://www.ossec.net/en/attacking-loganalysis.html (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2007-4304 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2007-4321)Record last updated .