Vulnerability in Openvpn
CVE-2005-2531
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.
Published · last modified .
CVSS v2 metric
CVSS v2 base score 5.0 (Medium). Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.
EPSS exploit prediction
EPSS: 0.020 (79.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000
Affected products
- Openvpn — versions 2.0, 2.0.1_rc1, 2.0.1_rc2
Public proof-of-concept exploits
References
- www.securityfocus.com/bid/14605 (vdb-entry)
- secunia.com/advisories/17103 (third-party-advisory)
- openvpn.net/changelog.html
- www.mandriva.com/security/advisories (vendor-advisory, Patch, Vendor Advisory)
- www.novell.com/linux/security/advisories/2005_20_sr.html (vendor-advisory)
- www.debian.org/security/2005/dsa-851 (vendor-advisory)
- secunia.com/advisories/16463 (third-party-advisory)
Frequently asked questions
- What is CVE-2005-2531?
- CVE-2005-2531 is a vulnerability in Openvpn. Published 2005-08-24.
- Is CVE-2005-2531 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.