CVE-2021-31885 Information disclosure in APOGEE MBC (PPC) (BACnet)
Attackers can read TFTP memory buffer contents via malformed commands, exposing sensitive data in Siemens building automation systems.
- 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-2021-31885?
CVE-2021-31885 is a high-severity vulnerability in Siemens APOGEE MBC (PPC) (BACnet), published on 9 Nov 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 MBC (PPC) (BACnet) (All versions), APOGEE MBC (PPC) (P2 Ethernet) (All versions), APOGEE MEC (PPC) (BACnet) (All versions), APOGEE MEC (PPC) (P2 Ethernet) (All versions), APOGEE PXC Compact (BACnet) (All versions < V3.5.4), APOGEE PXC Compact (P2 Ethernet) (All versions < V2.8.19), APOGEE PXC Modular (BACnet) (All versions < V3.5.4), APOGEE PXC Modular (P2 Ethernet) (All versions < V2.8.19), Desigo PXC00-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC00-U (All versions >= V2.3 and < V6.30.016), Desigo PXC001-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC100-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC12-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC128-U (All versions >= V2.3 and < V6.30.016), Desigo PXC200-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC22-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC22.1-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC36.1-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC50-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC64-U (All versions >= V2.3 and < V6.30.016), Desigo PXM20-E (All versions >= V2.3 and < V6.30.016), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus ReadyStart V4 (All versions < V4.1.1), Nucleus Source Code (All versions), PLUSCONTROL 1st Gen (All versions), TALON TC Compact (BACnet) (All versions < V3.5.4), TALON TC Modular (BACnet) (All versions < V3.5.4). TFTP server application allows for reading the contents of the TFTP memory buffer via sending malformed TFTP commands. (FSMD-2021-0009)
Weakness: CWE-805
Which versions are affected by CVE-2021-31885?
It affects 11 products.
Products include Siemens Apogee Modular Building Controller Firmware, Siemens Apogee Modular Equiment Controller Firmware, Siemens Apogee Pxc Compact Firmware, Siemens Apogee Pxc Modular Firmware, Siemens Capital Vstar, Siemens Nucleus Net and 5 more.
How do I fix CVE-2021-31885?
No fix has been published for CVE-2021-31885 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-31885 being exploited?
There is no known exploitation of CVE-2021-31885 in the wild and no public exploit code.
Other vulnerabilities in Siemens APOGEE MBC (PPC) (BACnet)
- CVE-2021-31884 Memory corruption in APOGEE MBC (PPC) (BACnet)
- CVE-2021-31886 Memory corruption in APOGEE MBC (PPC) (BACnet)
- CVE-2021-31887 Memory corruption in APOGEE MBC (PPC) (BACnet)
- CVE-2021-31888 Memory corruption in APOGEE MBC (PPC) (BACnet)
- CVE-2022-38371 Denial of service in APOGEE MBC (PPC) (BACnet)
Sources
Also known as GHSA-fc2w-gxv3-9vh5.