CVE-2017-7521
OpenVPN Denial-of-Service Memory Exhaustion Lease/Vulnerability
Description
OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to remote denial-of-service due to memory exhaustion caused by memory leaks and double-free issue in extract_x509_extension().
INFO
Published Date :
June 27, 2017, 1:29 p.m.
Last Modified :
April 20, 2025, 1:37 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | MEDIUM | [email protected] | ||||
| CVSS 3.0 | MEDIUM | [email protected] |
Solution
- Update OpenVPN to version 2.3.17 or 2.4.3 or later.
- Apply the latest available security patches.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2017-7521.
| URL | Resource |
|---|---|
| http://www.debian.org/security/2017/dsa-3900 | |
| http://www.securityfocus.com/bid/99230 | Third Party Advisory VDB Entry |
| http://www.securitytracker.com/id/1038768 | |
| https://community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243 | Vendor Advisory |
| http://www.debian.org/security/2017/dsa-3900 | |
| http://www.securityfocus.com/bid/99230 | Third Party Advisory VDB Entry |
| http://www.securitytracker.com/id/1038768 | |
| https://community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2017-7521 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2017-7521
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2017-7521 vulnerability anywhere in the article.
-
Cyber Security News
OpenVPN Vulnerability Let Attackers Crash Servers & Execute Remote Code
A critical security vulnerability in OpenVPN has been discovered that could allow attackers to crash servers, potentially disrupting secure communications for thousands of users worldwide. The vulnera ... Read more
The following table lists the changes that have been made to the
CVE-2017-7521 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference http://www.debian.org/security/2017/dsa-3900 Added Reference http://www.securityfocus.com/bid/99230 Added Reference http://www.securitytracker.com/id/1038768 Added Reference https://community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243 -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Oct. 09, 2019
Action Type Old Value New Value Added CWE Red Hat, Inc. CWE-400 -
CWE Remap by [email protected]
Oct. 03, 2019
Action Type Old Value New Value Changed CWE CWE-415 CWE-772 CWE-415 -
CVE Modified by [email protected]
Nov. 04, 2017
Action Type Old Value New Value Added Reference http://www.debian.org/security/2017/dsa-3900 [No Types Assigned] -
CVE Modified by [email protected]
Jul. 07, 2017
Action Type Old Value New Value Added Reference http://www.securitytracker.com/id/1038768 [No Types Assigned] -
Initial Analysis by [email protected]
Jul. 05, 2017
Action Type Old Value New Value Added CVSS V2 (AV:N/AC:M/Au:N/C:N/I:N/A:P) Added CVSS V3 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Changed Reference Type http://www.securityfocus.com/bid/99230 No Types Assigned http://www.securityfocus.com/bid/99230 Third Party Advisory, VDB Entry Changed Reference Type https://community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243 No Types Assigned https://community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243 Vendor Advisory Added CWE CWE-415 Added CPE Configuration OR *cpe:2.3:a:openvpn:openvpn:2.3.16:*:*:*:*:*:*:* (and previous) *cpe:2.3:a:openvpn:openvpn:2.4.0:*:*:*:*:*:*:* *cpe:2.3:a:openvpn:openvpn:2.4.0:alpha2:*:*:*:*:*:* *cpe:2.3:a:openvpn:openvpn:2.4.0:beta1:*:*:*:*:*:* *cpe:2.3:a:openvpn:openvpn:2.4.0:beta2:*:*:*:*:*:* *cpe:2.3:a:openvpn:openvpn:2.4.0:rc1:*:*:*:*:*:* *cpe:2.3:a:openvpn:openvpn:2.4.0:rc2:*:*:*:*:*:* *cpe:2.3:a:openvpn:openvpn:2.4.1:*:*:*:*:*:*:* *cpe:2.3:a:openvpn:openvpn:2.4.2:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Jun. 29, 2017
Action Type Old Value New Value Added Reference http://www.securityfocus.com/bid/99230 [No Types Assigned]
Vulnerability Scoring Details
Base CVSS Score: 5.9
Base CVSS Score: 4.3
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
1.08 }} 0.32%
score
0.77034
percentile