CVE-2005-2531: n/a vulnerability

CVE-2005-2531: OpenVPN before 2.0.1, when running with "verb 0" and without TLS authentication, does not properly flush th...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 7, 2024, 22:30 UTC (UTC+00:00)

Security readout for executives and security teams

This is an old OpenVPN denial-of-service flaw. Under a specific logging and TLS-auth configuration, repeated failed certificate authentication attempts could cause legitimate clients to be disconnected. The business impact is VPN availability, not disclosed data theft or code execution in the provided sources. Exposure is most plausible in legacy OpenVPN deployments before 2.0.1 using certificate authentication, verb 0, and no TLS authentication. Current systems are unlikely affected unless they retain very old packages, embedded builds, or unsupported VPN appliances. Treat this as a legacy availability risk. It does not indicate data compromise in the provided sources, but exposed old VPN infrastructure can disrupt remote access and signals weak lifecycle management. Mitigation focus: Upgrade OpenVPN to 2.0.1 or a vendor-fixed package.; Review Debian, SUSE, Mandriva, or relevant vendor advisories for packaged fixes.; Inventory legacy VPN servers and embedded appliances for OpenVPN versions before 2.0.1..

Prepared: Jun 29, 2026, 18:15 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2005-2531 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup

Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Aug 24, 2005, 04:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

1Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.