CVE & CISA-KEV Catalog

CVE-2021-37204

HIGHEPSS 81th pctl
7.5
CVSS v3
NVD

Description

A vulnerability has been identified in SIMATIC Drive Controller family (All versions < V2.9.2), SIMATIC Drive Controller family (All versions >= V2.9.2 < V2.9.4), SIMATIC ET 200SP Open Controller CPU 1515SP PC (incl. SIPLUS variants) (All versions), SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) (All versions < V21.9), SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) (All versions >= V21.9 < V21.9.4), SIMATIC ET 200SP Open Controller CPU 1515SP PC2 Ready4Linux (All versions), SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (All versions < V4.5.0), SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (All versions >= V4.5.0 < V4.5.2), SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions < V2.9.2), SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions >= V2.9.2 < V2.9.4), SIMATIC S7-1500 Software Controller (All versions < V21.9), SIMATIC S7-1500 Software Controller (All versions >= V21.9 < V21.9.4), SIMATIC S7-PLCSIM Advanced (All versions < V4.0), SIMATIC S7-PLCSIM Advanced (All versions >= V4.0 < V4.0 SP1), SIPLUS TIM 1531 IRC (All versions < V2.3.6), TIM 1531 IRC (All versions < V2.3.6). An unauthenticated attacker could cause a denial-of-service condition in a PLC when sending specially prepared packet over port 102/tcp. A restart of the affected device is needed to restore normal operations.

CWE-672

How to fix

Remediation Available
simatic drive controller cpu 1504d tf firmwareNVD
Affected:< 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic drive controller cpu 1507d tf firmwareNVD
Affected:< 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1200 cpu 1211c firmwareNVD
Affected:>= 4.5.0, < 4.5.2Fixed in:4.5.2CVE-2021-37204derived from NVD
simatic s7-1200 cpu 1212c firmwareNVD
Affected:>= 4.5.0, < 4.5.2Fixed in:4.5.2CVE-2021-37204derived from NVD
simatic s7-1200 cpu 1212fc firmwareNVD
Affected:>= 4.5.0, < 4.5.2Fixed in:4.5.2CVE-2021-37204derived from NVD
simatic s7-1200 cpu 1214c firmwareNVD
Affected:>= 4.5.0, < 4.5.2Fixed in:4.5.2CVE-2021-37204derived from NVD
simatic s7-1200 cpu 1214fc firmwareNVD
Affected:>= 4.5.0, < 4.5.2Fixed in:4.5.2CVE-2021-37204derived from NVD
simatic s7-1200 cpu 1215c firmwareNVD
Affected:>= 4.5.0, < 4.5.2Fixed in:4.5.2CVE-2021-37204derived from NVD
simatic s7-1200 cpu 1215fc firmwareNVD
Affected:>= 4.5.0, < 4.5.2Fixed in:4.5.2CVE-2021-37204derived from NVD
simatic s7-1200 cpu 1217c firmwareNVD
Affected:>= 4.5.0, < 4.5.2Fixed in:4.5.2CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1510sp-1 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1510sp firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1511-1 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1511c-1 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1511f-1 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1511t-1 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1511tf-1 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1512c-1 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1512sp-1 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1512spf-1 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1513-1 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1513f-1 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1513r-1 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1515-2 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1515f-2 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1515r-2 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1515t-2 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1515tf-2 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1516-3 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1516f-3 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1516pro-2 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1516pro f firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1516t-3 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1516tf-3 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1517-3 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1517f-3 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1517tf-3 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1518-4 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1518f-4 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1518hf-4 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1518t-4 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu 1518tf-4 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu cpu 1513pro-2 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-1500 cpu cpu 1513prof-2 firmwareNVD
Affected:>= 2.9.2, < 2.9.4Fixed in:2.9.4CVE-2021-37204derived from NVD
simatic s7-plcsim advanced firmwareNVD
Affected:< 4.0Fixed in:4.0CVE-2021-37204derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
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

Exploit Intelligence

2.18%probability of exploitation in 30 days
81stpercentile

Elevated risk: more likely to be exploited than 81% of all known CVEs.

References

Related Vulnerabilities

Other CWE-672 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2024-23638Medium6.560%-Fix
CVE-2020-11027Medium6.114%-Fix
CVE-2019-17638Critical9.411%-Fix
CVE-2009-3547High7.04.9%--
CVE-2019-15691High7.24.7%-Fix
CVE-2020-24030Critical9.82.7%--

Common questions

How do I fix CVE-2021-37204?

Published advisories record a fix for 45 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2021-37204 being actively exploited?

Not that we know of. CVE-2021-37204 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 2.2% is the estimated probability that it will be exploited in the next 30 days. That is higher than 81% of all scored CVEs.

How severe is CVE-2021-37204?

CVE-2021-37204 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-37204 affect?

Published advisories record a fix for simatic drive controller cpu 1504d tf firmware (NVD), simatic drive controller cpu 1507d tf firmware (NVD), simatic s7-1200 cpu 1211c firmware (NVD), simatic s7-1200 cpu 1212c firmware (NVD), and 41 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.