OpenVPN 2: Improper Restriction of Communication Channel to Intended Endpoints
CVE-2024-24974 is a high-severity improper restriction of communication channel to intended endpoints vulnerability in OpenVPN 2 from OpenVPN, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected OpenVPN 2 versions: 2.6.9 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 9.76% chance of exploitation within 30 days, which is in the top 4.4% of all scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update openvpn to 2.5.10 or 2.6.10, whichever matches your release line, or a later version.
- Read the advisory on community.openvpn.net for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| OpenVPN | OpenVPN 2 | 2.6.9 and earlier | Not stated |
| Openvpn | openvpn | before 2.5.10; 2.6.0 up to, but not including, 2.6.10 | 2.5.10, 2.6.10 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.5 | High | NVD |
| CVSS 3.1 | 7.5 | High | CISA (ADP) |
Official description
The interactive service in OpenVPN 2.6.9 and earlier allows the OpenVPN service pipe to be accessed remotely, which allows a remote attacker to interact with the privileged OpenVPN interactive service.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Restriction of Communication Channel to Intended Endpoints
The product establishes a communication channel to (or from) an endpoint for privileged or protected operations, but it does not properly ensure that it is communicating with the correct endpoint.
More Improper Restriction of Communication Channel to Intended Endpoints vulnerabilities (CWE-923)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Other references
- mail-archive.com/[email protected]/msg07534.htmlMailing List
Other vulnerabilities in OpenVPN 2
- 9.8 Critical severity
Recent Improper Restriction of Communication Channel to Intended Endpoints vulnerabilities
- 7.5 High severity
- 7.8 High severity
- 9.1 Critical severity
- 7.2 High severity
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