5

CVE-2005-2531: openvpn

CVSS: 5.0v2.0MediumModified
AliasesDEBIAN-CVE-2005-2531
Published 24-08-2005Last modified 07-08-2024
Open JSON

Vulnerability summary

CVE-2005-2531 is a medium (CVSS 5.0) vulnerability in openvpn. EPSS estimates a 1.97% chance of exploitation in the next 30 days, higher than 80% of scored vulnerabilities.

Overall risk
20/100
0100
Low · default modelHow is this calculated?
CVSS score
5.0/10
010
Medium · v2.0 (NVD)
EPSS score
1.97%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
DSA-851-1

Timeline

  1. 24-08-2005
    PublishedVulnerability first disclosed.
  2. 07-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

1 score · 1 source · 1 version

EPSS trend

Probability

1.97%

Chance of exploitation in the next 30 days

Percentile

80%

Versus all other CVEs

30-day change

0.00 pp

From 1.97% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.97%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Debian1 product
  • openvpn< 2.0.2-1
Openvpn1 product
  • openvpn2.0 | 2.0.1_rc1 | 2.0.1_rc2 | 2.0.1_rc3 | 2.0.1_rc4 | 2.0.1_rc5 | 2.0.1_rc6 | 2.0.1_rc7 | 2.0_beta1 | 2.0_beta2 | 2.0_beta3 | 2.0_beta4 | 2.0_beta5 | 2.0_beta6 | 2.0_beta7 | 2.0_beta8 | 2.0_beta9 | 2.0_beta10 | 2.0_beta11 | 2.0_beta12 | 2.0_beta13 | 2.0_beta15 | 2.0_beta16 | 2.0_beta17 | 2.0_beta18 | 2.0_beta19 | 2.0_beta20 | 2.0_beta28 | 2.0_rc1 | 2.0_rc2 | 2.0_rc3 | 2.0_rc4 | 2.0_rc5 | 2.0_rc6 | 2.0_rc7 | 2.0_rc8 | 2.0_rc9 | 2.0_rc10 | 2.0_rc11 | 2.0_rc12 | 2.0_rc13 | 2.0_rc14 | 2.0_rc15 | 2.0_rc16 | 2.0_rc17 | 2.0_rc18 | 2.0_rc19 | 2.0_rc20 | 2.0_rc21 | 2.0_test1 | 2.0_test2 | 2.0_test3 | 2.0_test5 | 2.0_test6 | 2.0_test7 | 2.0_test8 | 2.0_test9 | 2.0_test10 | 2.0_test11 | 2.0_test12 | 2.0_test14 | 2.0_test15 | 2.0_test16 | 2.0_test17 | 2.0_test18 | 2.0_test19 | 2.0_test20 | 2.0_test21 | 2.0_test22 | 2.0_test23 | 2.0_test24 | 2.0_test26 | 2.0_test27 | 2.0_test29

2 vendors · 2 products

References

8 links