HOMEVULNERABILITIESCVE-2021-20986
HIGH

CVE-2021-20986

CWE-787Published: February 16, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

A Denial of Service vulnerability was found in Hilscher PROFINET IO Device V3 in versions prior to V3.14.0.7. This may lead to unexpected loss of cyclic communication or interruption of acyclic communication.

NVD Source

Technical Analysis

CVE-2021-20986 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

hilscher2 product(s)
profinet io device firmwareprofinet io device
pepperl-fuchs71 product(s)
pgv100-f200a-b17-v1d firmwarepgv100-f200a-b17-v1dpgv150i-f200a-b17-v1d firmwarepgv150i-f200a-b17-v1dpgv100-f200-b17-v1d-7477 firmwarepgv100-f200-b17-v1d-7477pxv100-f200-b17-v1d firmwarepxv100-f200-b17-v1dpxv100-f200-b17-v1d-3636 firmwarepxv100-f200-b17-v1d-3636pcv80-f200-b17-v1d firmwarepcv80-f200-b17-v1d+59
Source: NVD CPE · 73 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://cert.vde.com/en-us/advisories/vde-2021-006
ADVISORYhttps://kb.hilscher.com/display/ISMS/2020-12-03+Denial+of+Service+vulnerability+in+PROFINET+IO+Device
ADVISORYhttps://cert.vde.com/en-us/advisories/vde-2021-006
ADVISORYhttps://kb.hilscher.com/display/ISMS/2020-12-03+Denial+of+Service+vulnerability+in+PROFINET+IO+Device

All References (4)

→
https://cert.vde.com/en-us/advisories/vde-2021-006Third Party Advisory
→
https://kb.hilscher.com/display/ISMS/2020-12-03+Denial+of+Service+vulnerability+in+PROFINET+IO+DeviceVendor Advisory
→
https://cert.vde.com/en-us/advisories/vde-2021-006Third Party Advisory
→
https://kb.hilscher.com/display/ISMS/2020-12-03+Denial+of+Service+vulnerability+in+PROFINET+IO+DeviceVendor Advisory

Quick Facts

CVE IDCVE-2021-20986
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-787
CISA KEVNo
Affected2 vendor(s)
PublishedFeb 16, 2021

Related CVEs (CWE-787)

CVE-2026-4746
10.0
CVE-2016-9343
10.0
CVE-2009-2466
10.0
CVE-2026-42369
10.0
CVE-2012-3957
10.0
CVE-2019-6235
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-20986 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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