CVE-2021-25677 Other in APOGEE PXC Compact (BACnet)
Insufficient DNS transaction ID randomization allows attackers to poison DNS cache or spoof DNS resolution in Siemens building automation and network products.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-25677?
CVE-2021-25677 is a medium-severity vulnerability in Siemens APOGEE PXC Compact (BACnet), published on 22 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-330
Which versions are affected by CVE-2021-25677?
It affects 5 products.
Products include Siemens Nucleus Net, Siemens Nucleus Readystart V3, Siemens Nucleus Readystart V4, Siemens Nucleus Source Code, Siemens Simotics Connect 400 Firmware.
How do I fix CVE-2021-25677?
No fix has been published for CVE-2021-25677 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-25677 being exploited?
There is no known exploitation of CVE-2021-25677 in the wild and no public exploit code.
Other vulnerabilities in Siemens APOGEE PXC Compact (BACnet)
- CVE-2020-15795 Memory corruption in APOGEE PXC Compact (BACnet)
- CVE-2020-27009 Memory corruption in APOGEE PXC Compact (BACnet)
- CVE-2020-27736 Memory corruption in APOGEE PXC Compact (BACnet)
- CVE-2020-27737 Memory corruption in APOGEE PXC Compact (BACnet)
- CVE-2020-27738 Memory corruption in APOGEE PXC Compact (BACnet)
Sources
Also known as GHSA-596h-hvjh-ffpf.