CVE-2021-25664

    Dashboard / Vulnerabilities / CVE-2021-25664

    CVE-2021-25664

    Published: 22 Apr 2021Last Modified: 10 Mar 2026

    Summary:

    Details: A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (All versions including affected IPv6 stack). The function that processes the Hop-by-Hop extension header in IPv6 packets and its options lacks any checks against the length field of the header, allowing attackers to put the function into an infinite loop by supplying arbitrary length values.

    References: , https://cert-portal.siemens.com/productcert/html/ssa-248289.html, https://cert-portal.siemens.com/productcert/pdf/ssa-248289.pdf, https://us-cert.cisa.gov/ics/advisories/icsa-21-103-05

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-25664 | CVE-DB