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High severity · published Apr 22, 2021
CVE-2021-25664
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),…
7.5
CVSS
1.9%
EPSS
No
On KEV
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 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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.9% · higher than 79% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CV
Capital Vstar · Siemens
All versions, or not specified · source: NVD
NN
Nucleus Net · Siemens
All versions, or not specified · source: NVD
NR
Nucleus Readystart V3 · Siemens
before 2017.02.4 · source: NVD
NR
Nucleus Readystart V4 · Siemens
before 4.1.0 · source: NVD
NS
Nucleus Source Code · Siemens
All versions, or not specified · source: NVD
Affected product
CV
Capital Vstar
Siemens
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-25664
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-25664
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/html/ssa-248289.html
Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-248289.pdf
Third Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-103-05
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