Modicon M340 CPUs: BMXP34 (All Versions): Uncontrolled Resource Consumption
CVE-2022-22724 is a high-severity uncontrolled resource consumption vulnerability in Modicon M340 CPUs: BMXP34 (All Versions), 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 Modicon M340 CPUs: BMXP34 (All Versions) versions: Modicon M340 CPUs: BMXP34 (All Versions). The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.93% chance of exploitation within 30 days, higher than 61% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Modicon M340 CPUs: BMXP34 (All Versions) you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on download.schneider-electric.com 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 |
|---|---|---|---|
| Modicon M340 CPUs: BMXP34 (All Versions) | Modicon M340 CPUs: BMXP34 (All Versions) | Modicon M340 CPUs: BMXP34 (All Versions) | Not stated |
| Schneider Electric | Modicon M340 Bmxp341000 Firmware | Not specified in the record | Not stated |
| Schneider Electric | Modicon M340 Bmxp342000 Firmware | Not specified in the record | Not stated |
| Schneider Electric | Modicon M340 Bmxp342010 Firmware | Not specified in the record | Not stated |
| Schneider Electric | Modicon M340 Bmxp3420102 Firmware | Not specified in the record | Not stated |
| Schneider Electric | Modicon M340 Bmxp342030 Firmware | Not specified in the record | Not stated |
| Schneider Electric | Modicon M340 Bmxp3420302 Firmware | Not specified in the record | Not stated |
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
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.5 | High | NVD |
| CVSS 2.0 | 5.0 | Medium | NVD |
Official description
A CWE-400: Uncontrolled Resource Consumption vulnerability exists that could cause a denial of service on ports 80 (HTTP) and 502 (Modbus), when sending a large number of TCP RST or FIN packets to any open TCP port of the PLC. Affected Product: Modicon M340 CPUs: BMXP34 (All Versions)
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Uncontrolled Resource Consumption
The product does not properly control the allocation and maintenance of a limited resource.
How developers prevent this class of flaw
- Ensure that protocols have specific limits of scale placed on them.
- Ensure that all failures in resource allocation place the system into a safe posture.
More Uncontrolled Resource Consumption vulnerabilities (CWE-400)
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Advisories
Recent Uncontrolled Resource Consumption vulnerabilities
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 5.9 Medium severity
Cisco IOS Denial-of-Service Exploited
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