CVE-2005-2531 json
OpenVPN before 2.0.1, when running with "verb 0" and without TLS authentication, does not properly flush the OpenSSL error queue when a cli…
published 2005-08-24 21 y ago modified 2026-06-16 4 mo ago also EUVD-2005-2532
- cvss
- 5.0
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.0%
- EPSS 2.0% chance of exploitation in 30 days, percentile 80%
- public exploits
- 0
- none known
Summary
OpenVPN before 2.0.1, when running with "verb 0" and without TLS authentication, does not properly flush the OpenSSL error queue when a client fails certificate authentication to the server and causes the error to be processed by the wrong client, which allows remote attackers to cause a denial of service (client disconnection) via a large number of failed authentication attempts.
Patch / fix
- openvpn Debian 14, Debian 13, Debian 12 2.0.2-1
debian advisories DEBIAN-CVE-2005-2531
Exploit prediction
1.97% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
References
-
mandriva.com
/security/advisories?name=MDKSA-2005:145
vendor-advisory, patch
-
novell.com
/linux/security/advisories/2005_20_sr.html
vendor-advisory
-
debian.org
/security/2005/dsa-851
vendor-advisory
-
securityfocus.com
/bid/14605
vdb-entry
-
secunia.com
/advisories/17103
third-party-advisory
- openvpn.net /changelog.html
-
secunia.com
/advisories/16463
third-party-advisory
Sources
- CVE List CVE-2005-2531
- NVD CVE-2005-2531
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.