High severity · published Nov 9, 2021
CVE-2021-31882
A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303)
7.5
CVSS
1.5%
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). The DHCP client application does not validate the length of the Domain Name Server IP option(s) (0x06) when processing DHCP ACK packets. This may lead to Denial-of-Service conditions. (FSMD-2021-0011)
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)1.5% · higher than 75% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AM
Apogee Modular Building Controller Firmware · Siemens
All versions, or not specified · source: NVD
AM
Apogee Modular Equiment Controller Firmware · Siemens
All versions, or not specified · source: NVD
AP
Apogee Pxc Compact Firmware · Siemens
All versions, or not specified · source: NVD
AP
Apogee Pxc Modular Firmware · Siemens
All versions, or not specified · source: NVD
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 2017.02.1 · source: NVD
NS
Nucleus Source Code · Siemens
All versions, or not specified · source: NVD
TT
Talon TC Compact Firmware · Siemens
All versions, or not specified · source: NVD
TT
Talon TC Modular Firmware · Siemens
All versions, or not specified · source: NVD
Affected product
AM
Apogee Modular Building Controller Firmware
Siemens
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-31882
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-31882
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/html/ssa-044112.html
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/html/ssa-114589.html
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/html/ssa-620288.html
Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-044112.pdf
Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-114589.pdf
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/pdf/ssa-620288.pdf
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