Modicon M580 CPU (part numbers BMEP* and…: Incorrect Calculation of Buffer Size
CVE-2024-11425 is a high-severity incorrect calculation of buffer size vulnerability in Modicon M580 CPU (part numbers BMEP* and BMEH*, excluding M580 CPU Safety) from Schneider Electric, 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 M580 CPU (part numbers BMEP* and BMEH*, excluding M580 CPU Safety) versions: Versions prior to SV4.30. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.62% chance of exploitation within 30 days, higher than 51% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Modicon M580 CPU (part numbers BMEP* and BMEH*, excluding M580 CPU Safety) you run against the affected versions below, and install the vendor's latest release.
- 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 |
|---|---|---|---|
| Schneider Electric | Modicon M580 CPU (part numbers BMEP* and BMEH*, excluding M580 CPU Safety) | Versions prior to SV4.30 | Not stated |
| Schneider Electric | Modicon M580 CPU Safety (part numbers BMEP58*S and BMEH58*S) | Versions prior to SV4.21 | Not stated |
| Schneider Electric | BMENOR2200H | All Versions | Not stated |
| Schneider Electric | EVLink Pro AC | Versions prior to v1.3.10 | 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 CNA (se.com).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 8.7 | High | CNA (se.com) |
| CVSS 3.1 | 7.5 | High | CNA (se.com) |
Official description
CWE-131: Incorrect Calculation of Buffer Size vulnerability exists that could cause Denial-of-Service of the product when an unauthenticated user is sending a crafted HTTPS packet to the webserver.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Incorrect Calculation of Buffer Size
The product does not correctly calculate the size to be used when allocating a buffer.
How developers prevent this class of flaw
- When allocating a buffer for the purpose of transforming, converting, or encoding an input, allocate enough memory to handle the largest possible encoding. For example, in a routine that converts & characters to & for HTML entity encoding, the output buffer needs to be at least 5 times as large as the input buffer.
- Understand the programming language's underlying representation and how it interacts with numeric calculation (CWE-681). Pay close attention to byte size discrepancies, precision, signed/unsigned distinctions, truncation, conversion and casting between types, not-a-number calculations, and how the language handles numbers that are too large or too small for its underlying representation. Also be careful to account for 32-bit, 64-bit, and other potential differences that may affect the numeric representation.
- Perform input validation on any numeric input by ensuring that it is within the expected range. Enforce that the input meets both the minimum and maximum requirements for the expected range.
More Incorrect Calculation of Buffer Size vulnerabilities (CWE-131)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Other references
Other vulnerabilities in Modicon M580 CPU (part numbers BMEP* and BMEH*, excluding M580 CPU Safety)
- 8.1 High severity
Recent Incorrect Calculation of Buffer Size vulnerabilities
- 7.5 High severity
- 7.5 High severity
- 7.8 High severity
- 7.8 High severity
- 7.5 High severity
- 7.5 High severity
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