CVE-2020-37216
DoS in Hirschmann HiOS via malformed UDP EtherNet/IP packets
Is CVE-2020-37216 being exploited?
Not confirmed. CVE-2020-37216 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.92% probability of exploitation in the next 30 days.
How severe is CVE-2020-37216?
CVE-2020-37216 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2020-37216?
Not known from our data. No patch reference has been recorded for CVE-2020-37216, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2020-37216 affect?
CVE-2020-37216 affects Hirschmann HiOS devices (EtherNet/IP stack) prior to 08.1.00 and 07.1.01. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2020-37216?
Upgrade to fixed HiOS versions; restrict UDP EtherNet/IP traffic
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attacker can crash/hang affected devices by sending oversized EtherNet/IP UDP packets, rendering devices inoperable.
Patch when possible
- affected>= 05.00.00 and <= 08.0.00
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.