CVE-2021-34598 Phoenix Contact: FL MGUARD lack of memory release in remote logging functionality
Attackers can cause a denial of service in Phoenix Contact FL MGUARD firewalls by exhausting memory through remote logging.
- 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-2021-34598?
CVE-2021-34598 is a high-severity denial of service vulnerability in PHOENIX CONTACT FL MGUARD, published on 10 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Phoenix Contact FL MGUARD 1102 and 1105 in Versions 1.4.0, 1.4.1 and 1.5.0 the remote logging functionality is impaired by the lack of memory release for data structures from syslog-ng when remote logging is active
Weakness: CWE-401
Which versions are affected by CVE-2021-34598?
It affects 2 products.
Products include Phoenixcontact Fl Mguard 1102 Firmware, Phoenixcontact Fl Mguard 1105 Firmware.
How do I fix CVE-2021-34598?
No fix has been published for CVE-2021-34598 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-34598 being exploited?
There is no known exploitation of CVE-2021-34598 in the wild and no public exploit code.
Other vulnerabilities in PHOENIX CONTACT FL MGUARD
Sources
Also known as GHSA-2mrx-q835-w93g.