CVE-2021-31889 - Integer Underflow (Wrap or Wraparound)

Severity

90%

Complexity

39%

Confidentiality

86%

CVSS 3.1 Base Score 9.1. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H).

CVSS 2.0 Base Score 6.4. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:N/A:P).

Demo Examples

Integer Underflow (Wrap or Wraparound)

CWE-191

The following example subtracts from a 32 bit signed integer.


               
}
return 0;

The example has an integer underflow. The value of i is already at the lowest negative value possible, so after subtracting 1, the new value of i is 2147483647.

Overview

Type

Siemens Nucleus

First reported 3 years ago

2021-11-09 12:15:00

Last updated 3 years ago

2021-12-14 12:15:00

Affected Software

Siemens Nucleus NET

Siemens Nucleus Source Code

References

https://cert-portal.siemens.com/productcert/pdf/ssa-044112.pdf

https://cert-portal.siemens.com/productcert/pdf/ssa-114589.pdf

https://cert-portal.siemens.com/productcert/pdf/ssa-044112.pdf

Vendor Advisory

https://cert-portal.siemens.com/productcert/pdf/ssa-114589.pdf

Vendor Advisory

N/A

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