Multiple vulnerabilities in Siemens Nucleus Products
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2021-25663 CVE-2021-25664 |
| CWE-ID | CWE-835 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
Nucleus NET Server applications / Other server solutions Nucleus ReadyStart Server applications / Other server solutions Nucleus Source Code Server applications / Other server solutions VSTAR Server applications / Other server solutions Nucleus 4 Server applications / Other server solutions |
| Vendor | Siemens |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Infinite loop
EUVDB-ID: #VU52216
Risk: Medium
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2021-25663
CWE-ID:
CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to infinite loop when the function that processes IPv6 headers does not check the lengths of extension header options. A remote attacker can consume all available system resources and cause denial of service conditions.
MitigationInstall updates from vendor's website.
Vulnerable software versionsNucleus NET: All versions
Nucleus ReadyStart: All versions
Nucleus Source Code: All versions
VSTAR: All versions
Nucleus 4: before 4.1.0
CPE2.3- 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:*:*:*:*:*:*:*:*
- cpe:2.3:a:siemens:nucleus_4:*:*:*:*:*:*:*:*
https://ics-cert.us-cert.gov/advisories/icsa-21-103-05
https://cert-portal.siemens.com/productcert/pdf/ssa-248289.pdf
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Infinite loop
EUVDB-ID: #VU52217
Risk: Medium
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2021-25664
CWE-ID:
CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to 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. A remote attacker can consume all available system resources and cause denial of service conditions.
MitigationInstall updates from vendor's website.
Vulnerable software versionsNucleus NET: All versions
Nucleus ReadyStart: All versions
Nucleus Source Code: All versions
VSTAR: All versions
Nucleus 4: before 4.1.0
CPE2.3- 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:*:*:*:*:*:*:*:*
- cpe:2.3:a:siemens:nucleus_4:*:*:*:*:*:*:*:*
https://ics-cert.us-cert.gov/advisories/icsa-21-103-05
https://cert-portal.siemens.com/productcert/pdf/ssa-248289.pdf
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
