Medium severity · published Apr 22, 2021
CVE-2021-25677
A vulnerability has been identified in APOGEE PXC Compact (BACnet) (All versions < V3.5.5), APOGEE PXC Compact (P2 Ethernet) (All versions < V2.8.20), APOGEE PXC Modular (BACnet)…
5.3
CVSS
1.1%
EPSS
No
On KEV
Description
A vulnerability has been identified in APOGEE PXC Compact (BACnet) (All versions < V3.5.5), APOGEE PXC Compact (P2 Ethernet) (All versions < V2.8.20), APOGEE PXC Modular (BACnet) (All versions < V3.5.5), APOGEE PXC Modular (P2 Ethernet) (All versions < V2.8.20), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.3), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (Versions including affected DNS modules), SIMOTICS CONNECT 400 (All versions < V0.5.0.0), SIMOTICS CONNECT 400 (All versions >= V0.5.0.0 < V1.0.0.0), TALON TC Compact (BACnet) (All versions < V3.5.5), TALON TC Modular (BACnet) (All versions < V3.5.5). The DNS client does not properly randomize DNS transaction IDs. That could allow an attacker to poison the DNS cache or spoof DNS resolving.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 64% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
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
SC
Simotics Connect 400 Firmware · Siemens
0.5.0.0 and later · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-25677
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-25677
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/pdf/ssa-180579.pdf
Patch
https://cert-portal.siemens.com/productcert/pdf/ssa-669158.pdf
Patch
https://cert-portal.siemens.com/productcert/pdf/ssa-705111.pdf
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