VYPR

CWE-343

Predictable Value Range from Previous Values

BaseDraft

Description

The product's random number generator produces a series of values which, when observed, can be used to infer a relatively small range of possibilities for the next value that could be generated.

The output of a random number generator should not be predictable based on observations of previous values. In some cases, an attacker cannot predict the exact value that will be produced next, but can narrow down the possibilities significantly. This reduces the amount of effort to perform a brute force attack. For example, suppose the product generates random numbers between 1 and 100, but it always produces a larger value until it reaches 100. If the generator produces an 80, then the attacker knows that the next value will be somewhere between 81 and 100. Instead of 100 possibilities, the attacker only needs to consider 20.

Hierarchy (View 1000)

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CVEs mapped to this weakness (5)

  • CVE-2017-7901HigJun 30, 2017
    risk 0.56cvss 8.6epss 0.07

    A Predictable Value Range from Previous Values issue was discovered in Rockwell Automation Allen-Bradley MicroLogix 1100 programmable-logic controllers 1763-L16AWA, Series A and B, Version 16.00 and prior versions; 1763-L16BBB, Series A and B, Version 16.00 and prior versions;…

  • CVE-2017-6030MedJun 30, 2017
    risk 0.42cvss 6.5epss 0.02

    A predictable value range from previous values issue was discovered in Schneider Electric Modicon PLCs Modicon M221, firmware versions prior to Version 1.5.0.0, Modicon M241, firmware versions prior to Version 4.0.5.11, and Modicon M251, firmware versions prior to Version…

  • CVE-2026-33221MedMar 20, 2026
    risk 0.27cvss 5.3epss 0.00

    Nhost is an open source Firebase alternative with GraphQL. Prior to version 0.12.0, the storage service's file upload handler trusts the client-provided Content-Type header without performing server-side MIME type detection. This allows an attacker to upload files with an…

  • CVE-2026-32694Mar 18, 2026
    risk 0.00cvss epss 0.00

    In Juju from version 3.0.0 through 3.6.18, when a secret owner grants permissions to a secret to a grantee, the secret owner relies exclusively on a predictable XID of the secret to verify ownership. This allows a malicious grantee which can request secrets to predict past…

  • CVE-2014-5409Mar 14, 2015
    risk 0.00cvss epss 0.03

    The 17046 Ethernet card before 94450214LFMT100SEM-L.R3-CL for the GE Digital Energy Hydran M2 does not properly generate random values for TCP Initial Sequence Numbers (ISNs), which makes it easier for remote attackers to spoof packets by predicting these values.