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CVE-2005-2531

UnknownEPSS 1.97%

Last modified

CVE-2005-2531 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 1.97% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability
1.97%

77.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
OpenvpnOpenvpn2.0
OpenvpnOpenvpn2.0.1_rc1
OpenvpnOpenvpn2.0.1_rc2
OpenvpnOpenvpn2.0.1_rc3
OpenvpnOpenvpn2.0.1_rc4
OpenvpnOpenvpn2.0.1_rc5
OpenvpnOpenvpn2.0.1_rc6
OpenvpnOpenvpn2.0.1_rc7
OpenvpnOpenvpn2.0_beta1
OpenvpnOpenvpn2.0_beta2
OpenvpnOpenvpn2.0_beta3
OpenvpnOpenvpn2.0_beta4
OpenvpnOpenvpn2.0_beta5
OpenvpnOpenvpn2.0_beta6
OpenvpnOpenvpn2.0_beta7
OpenvpnOpenvpn2.0_beta8
OpenvpnOpenvpn2.0_beta9
OpenvpnOpenvpn2.0_beta10
OpenvpnOpenvpn2.0_beta11
OpenvpnOpenvpn2.0_beta12
OpenvpnOpenvpn2.0_beta13
OpenvpnOpenvpn2.0_beta15
OpenvpnOpenvpn2.0_beta16
OpenvpnOpenvpn2.0_beta17
OpenvpnOpenvpn2.0_beta18
OpenvpnOpenvpn2.0_beta19
OpenvpnOpenvpn2.0_beta20
OpenvpnOpenvpn2.0_beta28
OpenvpnOpenvpn2.0_rc1
OpenvpnOpenvpn2.0_rc2
OpenvpnOpenvpn2.0_rc3
OpenvpnOpenvpn2.0_rc4
OpenvpnOpenvpn2.0_rc5
OpenvpnOpenvpn2.0_rc6
OpenvpnOpenvpn2.0_rc7
OpenvpnOpenvpn2.0_rc8
OpenvpnOpenvpn2.0_rc9
OpenvpnOpenvpn2.0_rc10
OpenvpnOpenvpn2.0_rc11
OpenvpnOpenvpn2.0_rc12
OpenvpnOpenvpn2.0_rc13
OpenvpnOpenvpn2.0_rc14
OpenvpnOpenvpn2.0_rc15
OpenvpnOpenvpn2.0_rc16
OpenvpnOpenvpn2.0_rc17
OpenvpnOpenvpn2.0_rc18
OpenvpnOpenvpn2.0_rc19
OpenvpnOpenvpn2.0_rc20
OpenvpnOpenvpn2.0_rc21
OpenvpnOpenvpn2.0_test1

Showing 50 of 74 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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.
How severe is CVE-2005-2531?
Severity scoring for CVE-2005-2531 is pending analysis. The EPSS model estimates a 1.97% probability of exploitation in the next 30 days.
How do I fix CVE-2005-2531?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST