MELSEC-Q Series Q03UDECPU: Integer Overflow or Wraparound
CVE-2024-0803 is a critical-severity integer overflow or wraparound vulnerability in MELSEC-Q Series Q03UDECPU from Mitsubishi Electric, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected MELSEC-Q Series Q03UDECPU versions: The first 5 digits of serial No. "26061" and prior. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 1.04% chance of exploitation within 30 days, higher than 65% of scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update melsec_q-q03udecpu to xxxxx26061 or a later version.
- Update melsec_q-q04udehcpu to xxxxx26061 or a later version.
- Update melsec_q-q06udehcpu to xxxxx26061 or a later version.
- Read the advisory on mitsubishielectric.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 |
|---|---|---|---|
| Mitsubishi Electric | MELSEC-Q Series Q03UDECPU | The first 5 digits of serial No. "26061" and prior | Not stated |
| Mitsubishi Electric | MELSEC-Q Series Q04UDEHCPU | The first 5 digits of serial No. "26061" and prior | Not stated |
| Mitsubishi Electric | MELSEC-Q Series Q06UDEHCPU | The first 5 digits of serial No. "26061" and prior | Not stated |
| Mitsubishi Electric | MELSEC-Q Series Q10UDEHCPU | The first 5 digits of serial No. "26061" and prior | Not stated |
| Mitsubishi Electric | MELSEC-Q Series Q13UDEHCPU | The first 5 digits of serial No. "26061" and prior | Not stated |
| Mitsubishi Electric | MELSEC-Q Series Q20UDEHCPU | The first 5 digits of serial No. "26061" and prior | Not stated |
| Mitsubishi Electric | MELSEC-Q Series Q26UDEHCPU | The first 5 digits of serial No. "26061" and prior | Not stated |
| Mitsubishi Electric | MELSEC-Q Series Q50UDEHCPU | The first 5 digits of serial No. "26061" and prior | Not stated |
| Mitsubishi Electric | MELSEC-Q Series Q100UDEHCPU | The first 5 digits of serial No. "26061" and prior | Not stated |
| Mitsubishi Electric | MELSEC-Q Series Q03UDVCPU | The first 5 digits of serial No. "26061" and prior | Not stated |
| Mitsubishi Electric | MELSEC-Q Series Q04UDVCPU | The first 5 digits of serial No. "26061" and prior | Not stated |
| Mitsubishi Electric | MELSEC-Q Series Q06UDVCPU | The first 5 digits of serial No. "26061" and prior | Not stated |
| Mitsubishi Electric | MELSEC-Q Series Q13UDVCPU | The first 5 digits of serial No. "26061" and prior | Not stated |
| Mitsubishi Electric | MELSEC-Q Series Q26UDVCPU | The first 5 digits of serial No. "26061" and prior | Not stated |
| Mitsubishi Electric | MELSEC-Q Series Q04UDPVCPU | The first 5 digits of serial No. "26061" and prior | Not stated |
| Mitsubishi Electric | MELSEC-Q Series Q06UDPVCPU | The first 5 digits of serial No. "26061" and prior | Not stated |
| Mitsubishi Electric | MELSEC-Q Series Q13UDPVCPU | The first 5 digits of serial No. "26061" and prior | Not stated |
| Mitsubishi Electric | MELSEC-Q Series Q26UDPVCPU | The first 5 digits of serial No. "26061" and prior | Not stated |
| Mitsubishi Electric | MELSEC-L Series L02CPU | The first 5 digits of serial No. "26041" and prior | Not stated |
| Mitsubishi Electric | MELSEC-L Series L06CPU | The first 5 digits of serial No. "26041" and prior | Not stated |
| Mitsubishi Electric | MELSEC-L Series L26CPU | The first 5 digits of serial No. "26041" and prior | Not stated |
| Mitsubishi Electric | MELSEC-L Series L02CPU-P | The first 5 digits of serial No. "26041" and prior | Not stated |
| Mitsubishi Electric | MELSEC-L Series L06CPU-P | The first 5 digits of serial No. "26041" and prior | Not stated |
| Mitsubishi Electric | MELSEC-L Series L26CPU-P | The first 5 digits of serial No. "26041" and prior | Not stated |
| Mitsubishi Electric | MELSEC-L Series L26CPU-BT | The first 5 digits of serial No. "26041" and prior | Not stated |
Version data comes from the organisation that assigned the CVE; 26 further products are omitted here. 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
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (yd.MitsubishiElectric.co.jp).
Official description
Integer Overflow or Wraparound vulnerability in Mitsubishi Electric Corporation MELSEC-Q Series and MELSEC-L Series CPU modules allows a remote unauthenticated attacker to execute malicious code on a target product by sending a specially crafted packet.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Integer Overflow or Wraparound
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
How developers prevent this class of flaw
- Ensure that all protocols are strictly defined, such that all out-of-bounds behavior can be identified simply, and require strict conformance to the protocol.
- Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. If possible, choose a language or compiler that performs automatic bounds checking.
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. Use libraries or frameworks that make it easier to handle numbers without unexpected consequences. Examples include safe integer handling packages such as SafeInt (C++) or IntegerLib (C or C++).
More Integer Overflow or Wraparound vulnerabilities (CWE-190)
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
Other vulnerabilities in MELSEC-Q Series Q03UDECPU
- 9.8 Critical severity
- 9.8 Critical severity
- 9.8 Critical severity
- 9.8 Critical severity
Recent Integer Overflow or Wraparound vulnerabilities
- 9.1 Critical severity
- 9.8 Critical severity
- 8.8 High severity
- 7.8 High severity
- 7.5 High severity
- 7.4 High severity
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