CVE-2013-6890 EXPLOIT
5.0
MEDIUM · CVSS 2.0 · EPSS 8.9% (pctl 95)
Patch early
A public exploit exists.
Description
denyhosts 2.6 uses an incorrect regular expression when analyzing authentication logs, which allows remote attackers to cause a denial of service (incorrect block of IP addresses) via crafted login names.
Scoring
| CVSS | 5.0 (MEDIUM, v2.0) |
|---|---|
| Vector | AV:N/AC:L/Au:N/C:N/I:N/A:P |
| EPSS | 8.9% — more likely to be exploited than 95% of all CVEs |
| Weakness | CWE-287 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2013-12-23 |
| Last modified | 2026-06-17 |
Affected (3)
| Vendor | Product |
|---|---|
| debian | debian linux |
| fedoraproject | fedora |
| phil schwartz | denyhosts |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | DenyHosts - 'regex.py' Remote Denial of Service | 2013-12-19 |
References
- http://seclists.org/oss-sec/2013/q4/535
- http://secunia.com/advisories/56239
- http://www.debian.org/security/2013/dsa-2826
- https://bugzilla.redhat.com/show_bug.cgi?id=1045982
- http://seclists.org/oss-sec/2013/q4/535
- http://secunia.com/advisories/56239
- http://www.debian.org/security/2013/dsa-2826
- https://bugzilla.redhat.com/show_bug.cgi?id=1045982
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