What is CVE-2021-37204?

CVE-2021-37204 is a high-severity vulnerability in Siemens Simatic Drive Controller Family, classified under Operation on a Resource after Expiration or Release. CVSS score: 7.5/10. Published 2022-02-09.

How severe is CVE-2021-37204?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2021-37204 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Siemens Simatic Drive Controller Family

CVE-2021-37204

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…

EPSS: 0.020 (84.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C.

Affected products

Siemens Simatic Drive Controller Family — versions All versions < V2.9.2, All versions >= V2.9.2 < V2.9.4
Siemens Simatic Et 200sp Open Controller Cpu 1515sp Pc2 (Incl. Siplus Variants) — versions All versions < V21.9, All versions >= V21.9 < V21.9.4
Siemens Simatic Et 200sp Open Controller Cpu 1515sp Pc2 Ready4linux — versions All versions
Siemens Simatic Et 200sp Open Controller Cpu 1515sp Pc (Incl. Siplus Variants) — versions All versions
Siemens Simatic S7-1200 Cpu Family (Incl. Siplus Variants) — versions All versions < V4.5.0, All versions >= V4.5.0 < V4.5.2
Siemens Simatic S7-1500 Cpu Family (Incl. Related Et200 Cpus And Siplus Variants) — versions All versions < V2.9.2, All versions >= V2.9.2 < V2.9.4
Siemens Simatic S7-1500 Software Controller — versions All versions < V21.9, All versions >= V21.9 < V21.9.4
Siemens Simatic S7-plcsim Advanced — versions All versions < V4.0, All versions >= V4.0 < V4.0 SP1
Siemens Siplus Tim 1531 Irc — versions All versions < V2.3.6
Siemens Tim 1531 Irc — versions All versions < V2.3.6

Weakness classification (CWE)

CWE-672 — Operation on a Resource after Expiration or Release

Public proof-of-concept exploits

References

cert-portal.siemens.com/productcert/pdf/ssa-838121.pdf

Frequently asked questions

What is CVE-2021-37204?: CVE-2021-37204 is a high-severity vulnerability in Siemens Simatic Drive Controller Family, classified under Operation on a Resource after Expiration or Release. CVSS score: 7.5/10. Published 2022-02-09.
How severe is CVE-2021-37204?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-37204 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.