7.5
HIGH
CVE-2021-25663
Capital Embedded AR Classic/IPv6 Extension Header Overflow
Description

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 IPv6 headers does not check the lengths of extension header options, allowing attackers to put this function into an infinite loop with crafted length values.

INFO

Published Date :

April 22, 2021, 9:15 p.m.

Last Modified :

Feb. 13, 2024, 9:15 a.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2021-25663 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Siemens capital_vstar
2 Siemens nucleus_net
3 Siemens nucleus_readystart_v3
4 Siemens nucleus_readystart_v4
5 Siemens nucleus_source_code
6 Siemens nucleus_readystart
: Total Affected Vendor : 1 | Products : 6
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-25663.

URL Resource
https://cert-portal.siemens.com/productcert/html/ssa-248289.html
https://cert-portal.siemens.com/productcert/pdf/ssa-248289.pdf Vendor Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-103-05 Third Party Advisory US Government Resource

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-25663 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-25663 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Feb. 13, 2024

    Action Type Old Value New Value
    Changed Description A vulnerability has been identified in Capital VSTAR (Versions including affected IPv6 stack), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (Versions including affected IPv6 stack). The function that processes IPv6 headers does not check the lengths of extension header options, allowing attackers to put this function into an infinite loop with crafted length values. 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 IPv6 headers does not check the lengths of extension header options, allowing attackers to put this function into an infinite loop with crafted length values.
    Added Reference Siemens AG https://cert-portal.siemens.com/productcert/html/ssa-248289.html [No types assigned]
    Added CVSS V3.1 Siemens AG AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • Modified Analysis by [email protected]

    Dec. 10, 2021

    Action Type Old Value New Value
    Added CWE NIST CWE-835
    Added CPE Configuration OR *cpe:2.3:a:siemens:nucleus_readystart:*:*:*:*:*:*:*:* versions up to (excluding) 2017.02.4
  • CVE Modified by [email protected]

    Nov. 17, 2021

    Action Type Old Value New Value
    Changed Description A vulnerability has been identified in Nucleus 4 (All versions < V4.1.0), Nucleus NET (All versions), Nucleus ReadyStart (All versions), Nucleus Source Code (versions including affected IPv6 stack), VSTAR (versions including affected IPv6 stack). The function that processes IPv6 headers does not check the lengths of extension header options, allowing attackers to put this function into an infinite loop with crafted length values. A vulnerability has been identified in Capital VSTAR (Versions including affected IPv6 stack), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (Versions including affected IPv6 stack). The function that processes IPv6 headers does not check the lengths of extension header options, allowing attackers to put this function into an infinite loop with crafted length values.
  • Modified Analysis by [email protected]

    Nov. 12, 2021

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:a:siemens:nucleus_4:*:*:*:*:*:*:*:* versions up to (excluding) 4.1.0 *cpe:2.3:a:siemens:nucleus_net:*:*:*:*:*:*:*:* *cpe:2.3:a:siemens:nucleus_readystart:*:*:*:*:*:*:*:* *cpe:2.3:a:siemens:nucleus_source_code:-:*:*:*:*:*:*:* *cpe:2.3:a:siemens:vstar:-:*:*:*:*:*:*:* OR *cpe:2.3:a:siemens:capital_vstar:-:*:*:*:*:*:*:* *cpe:2.3:a:siemens:nucleus_net:*:*:*:*:*:*:*:* *cpe:2.3:a:siemens:nucleus_readystart:*:*:*:*:*:*:*:* versions up to (excluding) 4.1.0 *cpe:2.3:a:siemens:nucleus_source_code:-:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Nov. 10, 2021

    Action Type Old Value New Value
    Changed Description A vulnerability has been identified in Capital VSTAR (Versions including affected IPv6 stack), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (Versions including affected IPv6 stack). The function that processes IPv6 headers does not check the lengths of extension header options, allowing attackers to put this function into an infinite loop with crafted length values. A vulnerability has been identified in Nucleus 4 (All versions < V4.1.0), Nucleus NET (All versions), Nucleus ReadyStart (All versions), Nucleus Source Code (versions including affected IPv6 stack), VSTAR (versions including affected IPv6 stack). The function that processes IPv6 headers does not check the lengths of extension header options, allowing attackers to put this function into an infinite loop with crafted length values.
  • CVE Modified by [email protected]

    Nov. 09, 2021

    Action Type Old Value New Value
    Changed Description A vulnerability has been identified in Nucleus 4 (All versions < V4.1.0), Nucleus NET (All versions), Nucleus ReadyStart (All versions), Nucleus Source Code (versions including affected IPv6 stack), VSTAR (versions including affected IPv6 stack). The function that processes IPv6 headers does not check the lengths of extension header options, allowing attackers to put this function into an infinite loop with crafted length values. A vulnerability has been identified in Capital VSTAR (Versions including affected IPv6 stack), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (Versions including affected IPv6 stack). The function that processes IPv6 headers does not check the lengths of extension header options, allowing attackers to put this function into an infinite loop with crafted length values.
  • Initial Analysis by [email protected]

    Apr. 30, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:N/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Changed Reference Type https://cert-portal.siemens.com/productcert/pdf/ssa-248289.pdf No Types Assigned https://cert-portal.siemens.com/productcert/pdf/ssa-248289.pdf Vendor Advisory
    Changed Reference Type https://us-cert.cisa.gov/ics/advisories/icsa-21-103-05 No Types Assigned https://us-cert.cisa.gov/ics/advisories/icsa-21-103-05 Third Party Advisory, US Government Resource
    Added CPE Configuration OR *cpe:2.3:a:siemens:nucleus_4:*:*:*:*:*:*:*:* versions up to (excluding) 4.1.0 *cpe:2.3:a:siemens:nucleus_net:*:*:*:*:*:*:*:* *cpe:2.3:a:siemens:nucleus_readystart:*:*:*:*:*:*:*:* *cpe:2.3:a:siemens:nucleus_source_code:-:*:*:*:*:*:*:* *cpe:2.3:a:siemens:vstar:-:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Apr. 23, 2021

    Action Type Old Value New Value
    Added Reference https://us-cert.cisa.gov/ics/advisories/icsa-21-103-05 [No Types Assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-25663 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-25663 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.18 }} 0.07%

score

0.54065

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
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