high
7.5
CWE
1287 20
Advisory Published
Updated

CVE-2021-44694: Input Validation

First published: Tue Dec 13 2022(Updated: )

Affected devices don't process correctly certain special crafted packets sent to port 102/tcp, which could allow an attacker to cause a denial of service in the device.

Credit: productcert@siemens.com

Affected SoftwareAffected VersionHow to fix
Siemens SIMATIC S7 PLCSIM Advanced Firmware<5.0
Siemens SIMATIC S7-PLCSIM Advanced Firmware
Siemens S7-1200 CPU 1211C Firmware<4.6.0
Siemens Simatic S7-1200 CPU 1211C Firmware
Siemens S7-1200 CPU 1212C Firmware<4.6.0
Siemens SIMATIC S7-1200 CPU 1212C Firmware
Siemens S7-1200 CPU 1212FC Firmware<4.6.0
Siemens S7-1200 CPU 1212FC
Siemens SIMATIC S7-1200 CPU 1214C Firmware<4.6.0
Siemens SIMATIC S7-1200 CPU 1214FC DC/DC/Rly
Siemens S7-1200 CPU 1214C Firmware<4.6.0
Siemens SIMATIC S7-1200 CPU
Siemens S7-1200 CPU 1214FC Firmware<4.6.0
Siemens SIMATIC S7-1200 CPU 1214FC Firmware
Siemens Simatic S7-1200 CPU Firmware<4.6.0
Siemens SIMATIC S7-1200 CPU 1215FC DC/DC/DC
Siemens SIMATIC S7-1200 CPU 1215C DC/DC/DC<4.6.0
Siemens CPU 1215C
Siemens Simatic S7-1200 CPU Firmware<4.6.0
Siemens SIMATIC S7-1200 CPU 1215FC DC/DC/DC
Siemens S7-1200 CPU 1217C Firmware<4.6.0
Siemens S7-1200 CPU 1217C
Siemens Simatic S7-1200 CPU 1211C Firmware<4.6.0
Siemens SIMATIC S7-1200 CPU 1211C
Siemens SIMATIC S7-1200 CPU 1212C Firmware<4.6.0
Siemens SIMATIC S7-1200 CPU 1212C
Siemens SIMATIC S7-1200 CPU 1212FC Firmware<4.6.0
Siemens SIMATIC S7-1200 CPU 1212FC
Siemens SIMATIC S7-1200 CPU 1214C Firmware<4.6.0
Siemens SIMATIC S7-1200 CPU 1214C Firmware
Siemens SIMATIC S7-1200 CPU 1214FC Firmware<4.6.0
Siemens SIMATIC S7-1200 CPU 1214FC
Siemens SIMATIC S7-1200 CPU 1215C Firmware<4.6.0
Siemens SIMATIC S7-1200 CPU 1215C Firmware
Siemens SIMATIC S7-1200 CPU 1215FC Firmware<4.6.0
Siemens SIMATIC S7-1200 CPU 1215FC Firmware
Siemens SIMATIC S7-1200 CPU 1217C Firmware<4.6.0
Siemens SIMATIC S7-1200 CPU 1217C
Siemens SIPLUS S7-1200 CP 1243-1<4.6.0
Siemens SIPLUS S7-1200 CP 1243-1
Siemens SIPLUS S7-1200<4.6.0
Siemens SIPLUS S7-1200
Siemens Simatic S7-1500 CPU 1507S F Firmware<3.0.1
Siemens Simatic S7-1500
Siemens S7-1500 Firmware<3.0.1
Siemens Simatic S7-1500 CPU 1507S F Firmware
Siemens SIMATIC S7-1500 Firmware<3.0.1
Siemens Simatic S7-1500
Siemens Simatic S7-1500 CPU 1508S F<3.0.1
Siemens S7-1500 CPU
Siemens SIMATIC S7-1500 CPU 1510SP Firmware<3.0.1
Siemens SIMATIC S7-1500 CPU 1510SP F-1
Siemens SIMATIC S7-1500 CPU 1510SP Firmware<3.0.1
Siemens SIMATIC S7-1500 CPU 1510SP Firmware
Siemens SIMATIC S7-1500 CPU 1511-1<3.0.1
Siemens SIMATIC S7-1500 CPU 1511-1 PN
Siemens SIMATIC S7-1500 CPU 1511-1 PN<3.0.1
Siemens SIMATIC S7-1500 CPU 1511-1
Siemens SIMATIC S7-1500 CPU 1511C-1 Firmware<3.0.1
Siemens SIMATIC S7-1500 CPU 1511C-1 PN
Siemens SIMATIC S7-1500 CPU 1511C-1<3.0.1
Siemens SIMATIC S7-1500 CPU 1511C-1 PN
Siemens SIMATIC S7-1500 CPU 1511f-1 PN<3.0.1
Siemens SIMATIC S7-1511F-1 PN CPU
Siemens SIMATIC S7-1500 CPU 1511F-1 Firmware<3.0.1
Siemens SIMATIC S7-1511F-1 PN CPU
Siemens SIMATIC S7-1500 CPU 1511T-1 Firmware<3.0.1
Siemens SIMATIC S7-1500 CPU 1511T-1 PN
Siemens SIMATIC S7-1500 CPU 1511TF-1<3.0.1
Siemens SIMATIC S7-1500 CPU 1511TF-1 PN
Siemens SIMATIC S7-1500 CPU 1512C Firmware<3.0.1
Siemens Simatic S7-1500
Siemens SIMATIC S7-1500 CPU 1512C-1 PN Firmware<3.0.1
Siemens SIMATIC S7-1500 CPU 1512C-1 PN
Siemens SIMATIC S7-1500 CPU 1512SP-1<3.0.1
Siemens SIMATIC S7-1500 CPU 1512SP-1 PN
Siemens SIMATIC S7-1500 CPU 1512SPF-1<3.0.1
Siemens SIMATIC S7-1500 CPU 1512SPF-1 Firmware
Siemens SIMATIC S7-1513-1 PN CPU<3.0.1
Siemens SIMATIC S7-1513-1 PN CPU
Siemens SIMATIC S7-1500 CPU 1513-1 PN firmware<3.0.1
siemens SIMATIC S7-1500 CPU 1513-1 PN firmware
Siemens SIMATIC S7-1500 CPU 1513F-1<3.0.1
Siemens SIMATIC S7-1500 CPU 1513f-1 PN
Siemens SIMATIC S7-1500 CPU 1513f-1 PN<3.0.1
Siemens SIMATIC S7-1513F-1 PN CPU
Siemens SIMATIC S7-1500 CPU 1513R-1 PN Firmware<3.0.1
Siemens SIMATIC S7-1500 CPU 1513R-1 Firmware
Siemens S7-1500 Firmware<3.0.1
Siemens SIMATIC S7-1515-2 PN CPU
Siemens Simatic S7-1500 CPU 1515-2 Firmware<3.0.1
Siemens SIMATIC S7-1500 CPU 1515-2
Siemens SIMATIC S7-1500 CPU 151511C-1<3.0.1
Siemens SIMATIC S7-1500 CPU 151511C-1
Siemens SIMATIC S7-1500 CPU 151511F-1<3.0.1
Siemens SIMATIC S7-1500 CPU 1511F-1 Firmware
Siemens SIMATIC S7-1500 CPU 1515f-2 PN firmware<3.0.1
Siemens S7-1500 CPU
Siemens SIMATIC S7-1515F-2 PN CPU<3.0.1
Siemens SIMATIC S7-1515F-2 PN CPU
Siemens Simatic S7-1500 CPU 1515R-2 Firmware<3.0.1
Siemens SIMATIC S7-1500 CPU 1515R-2 PN
Siemens Simatic S7-1500 CPU 1515T-2 Firmware<3.0.1
Siemens Simatic S7-1500 CPU 1515T-2 PN
Siemens SIMATIC S7-1500 CPU 1515TF-2<3.0.1
Siemens SIMATIC S7-1500 CPU 1515TF-2 PN
Siemens SIMATIC S7-1500 CPU 1516-3<3.0.1
Siemens SIMATIC S7-1500
Siemens SIMATIC S7-1500 CPU 1516-3 DP Firmware<3.0.1
Siemens SIMATIC S7-1500 CPU 1516-3 DP Firmware
Siemens SIMATIC S7-1516-3 PN/DP CPU<3.0.1
Siemens SIMATIC S7-1500 CPU 1516-3
Siemens SIMATIC S7-1500 CPU 1516-3 PN/DP Firmware<3.0.1
Siemens SIMATIC S7-1500 CPU 1516-3 PN/DP
Siemens SIMATIC S7-1516F-3 PN/DP CPU<3.0.1
Siemens SIMATIC S7-1516F-3 PN/DP CPU
Siemens SIMATIC S7-1500 CPU 1516F-3 PN/DP Firmware<3.0.1
Siemens SIMATIC S7-1500 CPU 1516f-3 PN/DP
Siemens SIMATIC S7-1500 CPU 1516PRO-2 Firmware<3.0.1
Siemens SIMATIC S7-1500 CPU 1516pro-2 PN
Siemens SIMATIC S7-1500 CPU 1516PRO F Firmware<3.0.1
Siemens SIMATIC S7-1500 CPU 1516PRO F-2 PN
Siemens Simatic S7-1500 CPU 1516T-3<3.0.1
Siemens Simatic S7-1500
Siemens SIMATIC S7-1500 CPU 1516TF-3 Firmware<3.0.1
Siemens Simatic S7-1500
Siemens SIMATIC S7-1500 CPU 1517-3 PN Firmware<3.0.1
Siemens SIMATIC S7-1517-3 PN/DP CPU
Siemens SIMATIC S7-1500 CPU 1517-3 DP<3.0.1
Siemens SIMATIC S7-1517-3 PN/DP CPU
Siemens SIMATIC S7-1500 CPU 1517-3 PN<3.0.1
Siemens SIMATIC S7-1517-3 PN/DP CPU
siemens SIMATIC S7-1500 CPU 1517-3 pn/dp firmware<3.0.1
Siemens SIMATIC S7-1500 CPU 1517-3 PN/DP
Siemens SIMATIC S7-1500 CPU 1517F-3<3.0.1
Siemens SIMATIC S7-1500 CPU 1517F-3 Firmware
siemens SIMATIC S7-1500 CPU 1517f-3 pn/dp firmware<3.0.1
Siemens SIMATIC S7-1500 CPU 1517f-3 PN/DP
Siemens SIMATIC S7-1500 T Firmware<3.0.1
Siemens SIMATIC S7-1500 CPU 1517TF-3 Firmware
Siemens SIMATIC S7-1500 CPU 1518F-4<3.0.1
Siemens S7-1500
Siemens SIMATIC S7-1518-4 PN/DP CPU<3.0.1
Siemens SIMATIC S7-1500
Siemens Simatic S7-1500 CPU 1518-4 DP<3.0.1
Siemens Simatic S7-1500
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP Firmware<3.0.1
Siemens SIMATIC CPU 1518-4
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP Firmware<3.0.1
Siemens Simatic S7-1500 CPU 1518-4 PN/DP MFP
Siemens Simatic S7-1500 CPU 1518-4 PN/DP MFP<3.0.1
Siemens Simatic S7-1500 CPU 1518-4 PN/DP MFP
Siemens SIMATIC S7-1500 CPU 1518F-4<3.0.1
Siemens SIMATIC S7-1518F-4 PN/DP CPU
Siemens SIMATIC S7-1500 CPU 1518f-4 pn/dp firmware<3.0.1
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP
Siemens SIMATIC S7-1500 CPU 1518-4 Firmware<3.0.1
Siemens Simatic S7-1500
Siemens Simatic S7-1500 CPU 1518T-4 PN/DP Firmware<3.0.1
Siemens Simatic S7-1500
Siemens SIMATIC S7-1500 CPU 1518T-4 Firmware<3.0.1
Siemens Simatic S7-1500
Siemens SIMATIC S7-1500 CPU 15PROF-2 Firmware<3.0.1
Siemens SIMATIC S7-1500 CPU 15PRO-2 Firmware
Siemens Simatic S7-1500 CPU 15PROF-2<3.0.1
Siemens SIMATIC S7-1500 CPU 15PROF-2 Firmware
Siemens Simatic S7-1500 CPU 1513Pro-2<3.0.1
Siemens Simatic S7-1500 CPU 1513Pro-2
Siemens SIMATIC S7-1500 CPU 1513PROF-2 Firmware<3.0.1
Siemens SIMATIC S7-1500 CPU 1513PROF-2 Firmware
Siemens SIPLUS ET 200SP<3.0.1
Siemens SIMATIC NET CP 1542SP-1 IRC
Siemens SIMATIC CP 1543SP-1<3.0.1
Siemens SIMATIC CP 1543SP-1
Siemens SIPLUS ET 200SP<3.0.1
Siemens SIPLUS ET 200SP
Siemens Simatic ET200SP 1515SP PC2 Firmware
Siemens SIMATIC ET 200SP Open Controller CPU 1515SP PC
Siemens S7-1500 Modular Controllers
Siemens S7-1500 Controller
Siemens Simatic TIM 1531 IRC Firmware
Siemens Simatic TIM 1531 IRC Firmware
Siemens Simatic TIM 1531 IRC Firmware
Siemens TIM 1531 IRC Firmware

Remedy

https://cert-portal.siemens.com/productcert/pdf/ssa-382653.pdf

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2021-44694?

    CVE-2021-44694 has been designated a medium severity vulnerability due to its potential to cause denial of service.

  • How do I fix CVE-2021-44694?

    To mitigate CVE-2021-44694, users should apply the latest firmware updates provided by Siemens for affected devices.

  • Which Siemens devices are affected by CVE-2021-44694?

    CVE-2021-44694 affects several Siemens SIMATIC S7-1200 and S7-1500 CPUs and firmware versions prior to specified releases.

  • What kind of attack does CVE-2021-44694 allow?

    CVE-2021-44694 allows attackers to send specially crafted packets to port 102/tcp, potentially leading to a denial of service.

  • Is there a workaround for CVE-2021-44694?

    Currently, the recommended approach to mitigate CVE-2021-44694 is to update to the latest firmware version, as no specific workaround is available.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2025 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203