# What is CVE-2017-12741?

> CVE-2017-12741 is a high-severity flaw (CVSS 7.5) in Simatic S7-200 Firmware from Siemens, published on 26 December 2017. It is not on the list of flaws known to be exploited today. The latest forecast puts its chance of use in the next 30 days at 3.3%. If you run an affected version, plan in the vendor’s fix.

Canonical page: https://www.precursorintelligence.com/what-is/cve-2017-12741

## At a glance

- **Verdict:** Plan it in. No sign of exploitation and a low forecast. Patch it in your normal update cycle.
- **Precursor Intelligence risk score:** 49 out of 100 (Medium); action: Plan remediation. Kept up to date as the evidence changes.
- **Severity:** High (CVSS 7.5 out of 10)
- **Known to be exploited:** No, not on the list of flaws known to be exploited today
- **Chance of use in the next 30 days:** 3.3% (latest exploit-likelihood forecast)
- **Published:** 26 December 2017
- **Record last updated:** 20 April 2025
- **Main product:** Simatic S7-200 Firmware from Siemens
- **Affected products:** 76

## What is CVE-2017-12741? In plain terms

It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can take it offline.

### The official description

Specially crafted packets sent to port 161/udp could cause a denial of service condition. The affected devices must be restarted manually.

### What kind of flaw is it?

- CWE-400: Uncontrolled Resource Consumption

### How an attack on it works

- Where an attacker can be: Anywhere on the internet
- How hard it is to pull off: Easy: no special conditions
- Login needed first: No login needed
- Does someone have to click: No, nobody has to do anything
- What an attacker gets: Can take it offline

Severity vector: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`

## Is CVE-2017-12741 being exploited? Not that we know of

It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 3.3%. That can change at any time, which is why we keep watching.

Exploit likelihood over the last 7 days: 3.3%, 3.3%, 3.3%, 3.3%, 3.3%, 3.3%, 3.3%.

### Timeline

- 26 December 2017: Published
- 20 April 2025: Record last updated

### How Precursor Intelligence ranks it

CVE-2017-12741 scores **49 out of 100 (Medium)**, with the action "Plan remediation".

Every published flaw gets a risk score from 0 to 100, kept up to date as the evidence changes. Four things go into the score, from the one that counts most to the ones that count less:

- Evidence it is being exploited: biggest factor
- How severe it is: strong factor
- How widely exposed it is: smaller factor
- Threat activity around it: smaller factor

85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score. When this flaw matches software you track, it lands in your list with its score and the reasons behind it.

## Who is affected by CVE-2017-12741?

The published record lists 76 products. Versions are as published: "before 2.03.01" means every version up to, but not including, 2.03.01.

- [Simatic S7-200 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-200_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 2.03.01
- [Dk Standard Ethernet Controller](https://www.precursorintelligence.com/product/siemens/dk_standard_ethernet_controller) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Dk Standard Ethernet Controller Firmware](https://www.precursorintelligence.com/product/siemens/dk_standard_ethernet_controller_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Ek-Ertec 200p](https://www.precursorintelligence.com/product/siemens/ek-ertec_200p) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Ek-Ertec 200p Firmware](https://www.precursorintelligence.com/product/siemens/ek-ertec_200p_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 4.5
- [Ek-Ertec 200pn Io](https://www.precursorintelligence.com/product/siemens/ek-ertec_200pn_io) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Ek-Ertec 200pn Io Firmware](https://www.precursorintelligence.com/product/siemens/ek-ertec_200pn_io_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Simatic Compact Field Unit](https://www.precursorintelligence.com/product/siemens/simatic_compact_field_unit) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic Compact Field Unit Firmware](https://www.precursorintelligence.com/product/siemens/simatic_compact_field_unit_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Simatic Et 200al](https://www.precursorintelligence.com/product/siemens/simatic_et_200al) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic Et 200al Firmware](https://www.precursorintelligence.com/product/siemens/simatic_et_200al_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Simatic Et 200ecopn](https://www.precursorintelligence.com/product/siemens/simatic_et_200ecopn) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic Et 200ecopn Firmware](https://www.precursorintelligence.com/product/siemens/simatic_et_200ecopn_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Simatic Et 200m](https://www.precursorintelligence.com/product/siemens/simatic_et_200m) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic Et 200m Firmware](https://www.precursorintelligence.com/product/siemens/simatic_et_200m_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Simatic Et 200mp](https://www.precursorintelligence.com/product/siemens/simatic_et_200mp) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic Et 200mp Firmware](https://www.precursorintelligence.com/product/siemens/simatic_et_200mp_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Simatic Et 200pro](https://www.precursorintelligence.com/product/siemens/simatic_et_200pro) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic Et 200pro Firmware](https://www.precursorintelligence.com/product/siemens/simatic_et_200pro_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Simatic Et 200s](https://www.precursorintelligence.com/product/siemens/simatic_et_200s) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic Et 200s Firmware](https://www.precursorintelligence.com/product/siemens/simatic_et_200s_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Simatic Et 200sp](https://www.precursorintelligence.com/product/siemens/simatic_et_200sp) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic Et 200sp Firmware](https://www.precursorintelligence.com/product/siemens/simatic_et_200sp_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- Simatic Pn/pn Coupler by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- Simatic Pn/pn Coupler Firmware by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Simatic S7-1200](https://www.precursorintelligence.com/product/siemens/simatic_s7-1200) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-1200 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1200_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Simatic S7-1500](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-1500 Controller](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_controller) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-1500 Controller Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_controller_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.0
- [Simatic S7-1500 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 2.0
- [Simatic S7-200](https://www.precursorintelligence.com/product/siemens/simatic_s7-200) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-300](https://www.precursorintelligence.com/product/siemens/simatic_s7-300) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-300 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-300_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Simatic S7-400h V6](https://www.precursorintelligence.com/product/siemens/simatic_s7-400h_v6) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-400h V6 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-400h_v6_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 6.0.8
- [Simatic S7-400pn V6](https://www.precursorintelligence.com/product/siemens/simatic_s7-400pn_v6) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-400pn V6 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-400pn_v6_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 6.0.6
- Simatic S7-400pn/dp V7 by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- Simatic S7-400pn/dp V7 Firmware by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Simatic S7-410 V8](https://www.precursorintelligence.com/product/siemens/simatic_s7-410_v8) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-410 V8 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-410_v8_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Simatic Winac Rtx F 2010](https://www.precursorintelligence.com/product/siemens/simatic_winac_rtx_f_2010) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic Winac Rtx F 2010 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_winac_rtx_f_2010_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Simocode Pro V Profinet](https://www.precursorintelligence.com/product/siemens/simocode_pro_v_profinet) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simocode Pro V Profinet Firmware](https://www.precursorintelligence.com/product/siemens/simocode_pro_v_profinet_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Simotion C](https://www.precursorintelligence.com/product/siemens/simotion_c) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simotion C Firmware](https://www.precursorintelligence.com/product/siemens/simotion_c_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): up to 5.1
- [Simotion D](https://www.precursorintelligence.com/product/siemens/simotion_d) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simotion D Firmware](https://www.precursorintelligence.com/product/siemens/simotion_d_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): up to 5.1
- [Simotion P](https://www.precursorintelligence.com/product/siemens/simotion_p) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simotion P Firmware](https://www.precursorintelligence.com/product/siemens/simotion_p_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): up to 5.1
- [Sinamics Dcm](https://www.precursorintelligence.com/product/siemens/sinamics_dcm) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Sinamics Dcm Firmware](https://www.precursorintelligence.com/product/siemens/sinamics_dcm_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Sinamics Dcp](https://www.precursorintelligence.com/product/siemens/sinamics_dcp) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Sinamics Dcp Firmware](https://www.precursorintelligence.com/product/siemens/sinamics_dcp_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- Sinamics G110m/g120pn by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- Sinamics G110m/g120pn Firmware by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): up to 4.7
- [Sinamics G130](https://www.precursorintelligence.com/product/siemens/sinamics_g130) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Sinamics G130 Firmware](https://www.precursorintelligence.com/product/siemens/sinamics_g130_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Sinamics G150](https://www.precursorintelligence.com/product/siemens/sinamics_g150) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Sinamics G150 Firmware](https://www.precursorintelligence.com/product/siemens/sinamics_g150_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Sinamics S110pn](https://www.precursorintelligence.com/product/siemens/sinamics_s110pn) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Sinamics S110pn Firmware](https://www.precursorintelligence.com/product/siemens/sinamics_s110pn_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Sinamics S120](https://www.precursorintelligence.com/product/siemens/sinamics_s120) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Sinamics S120 Firmware](https://www.precursorintelligence.com/product/siemens/sinamics_s120_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Sinamics S150 V4.7](https://www.precursorintelligence.com/product/siemens/sinamics_s150_v4.7) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Sinamics S150 V4.7 Firmware](https://www.precursorintelligence.com/product/siemens/sinamics_s150_v4.7_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Sinamics S150 V4.8](https://www.precursorintelligence.com/product/siemens/sinamics_s150_v4.8) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Sinamics S150 V4.8 Firmware](https://www.precursorintelligence.com/product/siemens/sinamics_s150_v4.8_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Sinamics V90pn](https://www.precursorintelligence.com/product/siemens/sinamics_v90pn) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Sinamics V90pn Firmware](https://www.precursorintelligence.com/product/siemens/sinamics_v90pn_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Sinumerik 840d Sl](https://www.precursorintelligence.com/product/siemens/sinumerik_840d_sl) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Sinumerik 840d Sl Firmware](https://www.precursorintelligence.com/product/siemens/sinumerik_840d_sl_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified
- [Sirius Soft Starter 3rw44pn](https://www.precursorintelligence.com/product/siemens/sirius_soft_starter_3rw44pn) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Sirius Soft Starter 3rw44pn Firmware](https://www.precursorintelligence.com/product/siemens/sirius_soft_starter_3rw44pn_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): version not specified

## How do I fix CVE-2017-12741?

1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? Precursor Intelligence can work it out from your public website, or you can pick it from a list.
2. **Apply the vendor’s fix.** Install the latest update from the vendor. The references list where the vendor has published details.
3. **If you can’t patch today.** Follow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in.
4. **Keep an eye on it.** Track the product and we tell you as soon as we spot this flaw on the list of exploited flaws, or a jump in its exploit likelihood.

### References

- [cert-portal.siemens.com](https://cert-portal.siemens.com/productcert/html/ssa-141614.html)
- [cert-portal.siemens.com](https://cert-portal.siemens.com/productcert/html/ssa-346262.html)
- [cert-portal.siemens.com](https://cert-portal.siemens.com/productcert/html/ssa-546832.html)
- [cert-portal.siemens.com](https://cert-portal.siemens.com/productcert/pdf/ssa-141614.pdf)
- [cert-portal.siemens.com](https://cert-portal.siemens.com/productcert/pdf/ssa-346262.pdf)
- [cert-portal.siemens.com](https://cert-portal.siemens.com/productcert/pdf/ssa-546832.pdf)
- [securityfocus.com](https://www.securityfocus.com/bid/101964)

## Questions

### What is CVE-2017-12741?

CVE-2017-12741 is a high-severity flaw in Simatic S7-200 Firmware from Siemens, published on 26 December 2017. It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can take it offline.

### How serious is CVE-2017-12741?

It scores 7.5 out of 10 on the CVSS severity scale, which is high. Our risk score for CVE-2017-12741 is 49 out of 100, which is Medium. Its action is "Plan remediation". No sign of exploitation and a low forecast. Patch it in your normal update cycle.

### Is CVE-2017-12741 being exploited?

It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 3.3%. That can change at any time, which is why we keep watching.

### Which versions does CVE-2017-12741 affect?

For Simatic S7-200 Firmware from Siemens: before 2.03.01. The record lists 76 products in all, each with its versions, under "Who is affected" on this page.

### How do I fix CVE-2017-12741?

Install the update the vendor names in its advisory. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet.

## Does CVE-2017-12741 affect you?

Precursor Intelligence keeps checking for you:

- **Tell us what you run.** Pick your software from a list, or let us work it out from your website.
- **We match it to every flaw.** Over 400,000 published flaws, checked against your list.
- **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it.
- **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools.

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