# What is CVE-2019-19281?

> CVE-2019-19281 is a high-severity flaw (CVSS 7.5) in Simatic Et 200sp Open Controller CPU 1515sp Pc2 from Siemens, published on 10 March 2020. 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 1.7%. If you run an affected version, plan in the vendor’s fix.

Canonical page: https://www.precursorintelligence.com/what-is/cve-2019-19281

## 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:** 47 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:** 1.7% (latest exploit-likelihood forecast)
- **Published:** 10 March 2020
- **Record last updated:** 2 April 2020
- **Main product:** Simatic Et 200sp Open Controller CPU 1515sp Pc2 from Siemens
- **Affected products:** 28

## What is CVE-2019-19281? 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

A vulnerability has been identified in SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) (All versions >= V2.5 and = V2.5 and = V2.5 and < V20.8). Affected devices contain a vulnerability that allows an unauthenticated attacker to trigger a Denial-of-Service condition. The vulnerability can be triggered if specially crafted UDP packets are sent to the device. The security vulnerability could be exploited by an attacker with network access to the affected systems. Successful exploitation requires no system privileges and no user interaction. An attacker could use the vulnerability to compromise the device availability.

### 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-2019-19281 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 1.7%. That can change at any time, which is why we keep watching.

Exploit likelihood over the last 7 days: 1.7%, 1.7%, 1.7%, 1.7%, 1.7%, 1.7%, 1.7%.

### Timeline

- 10 March 2020: Published
- 2 April 2020: Record last updated

### How Precursor Intelligence ranks it

CVE-2019-19281 scores **47 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-2019-19281?

The published record lists 28 products. Versions are as published: "2.5 to before 20.8" means from 2.5 up to, but not including, 20.8.

- [Simatic Et 200sp Open Controller CPU 1515sp Pc2](https://www.precursorintelligence.com/product/siemens/simatic_et_200sp_open_controller_cpu_1515sp_pc2) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic Et 200sp Open Controller CPU 1515sp Pc2 Firmware](https://www.precursorintelligence.com/product/siemens/simatic_et_200sp_open_controller_cpu_1515sp_pc2_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.5 to before 20.8
- [Simatic S7-1500 CPU 1507s](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1507s) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-1500 CPU 1507s F](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1507s_f) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-1500 CPU 1507s F Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1507s_f_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.5 to before 20.8
- [Simatic S7-1500 CPU 1507s Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1507s_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.5 to before 20.8
- [Simatic S7-1500 CPU 1508s](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1508s) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-1500 CPU 1508s F](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1508s_f) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-1500 CPU 1508s F Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1508s_f_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.5 to before 20.8
- [Simatic S7-1500 CPU 1508s Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1508s_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.5 to before 20.8
- [Simatic S7-1500 CPU 1511-1 Pn](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1511-1_pn) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-1500 CPU 1511-1 Pn Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1511-1_pn_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.5 to before 2.8
- [Simatic S7-1500 CPU 1513-1 Pn](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1513-1_pn) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-1500 CPU 1513-1 Pn Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1513-1_pn_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.5 to before 2.8
- [Simatic S7-1500 CPU 1515-2 Pn](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1515-2_pn) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-1500 CPU 1515-2 Pn Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1515-2_pn_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.5 to before 2.8
- [Simatic S7-1500 CPU 1516-3 Dp](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1516-3_dp) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-1500 CPU 1516-3 Dp Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1516-3_dp_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.5 to before 2.8
- [Simatic S7-1500 CPU 1516-3 Pn](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1516-3_pn) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-1500 CPU 1516-3 Pn Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1516-3_pn_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.5 to before 2.8
- [Simatic S7-1500 CPU 1517-3 Dp](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1517-3_dp) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-1500 CPU 1517-3 Dp Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1517-3_dp_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.5 to before 2.8
- [Simatic S7-1500 CPU 1517-3 Pn](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1517-3_pn) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-1500 CPU 1517-3 Pn Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1517-3_pn_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.5 to before 2.8
- [Simatic S7-1500 CPU 1518-4 Dp](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1518-4_dp) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-1500 CPU 1518-4 Dp Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1518-4_dp_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.5 to before 2.8
- [Simatic S7-1500 CPU 1518-4 Pn](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1518-4_pn) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified
- [Simatic S7-1500 CPU 1518-4 Pn Firmware](https://www.precursorintelligence.com/product/siemens/simatic_s7-1500_cpu_1518-4_pn_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): 2.5 to before 2.8

## How do I fix CVE-2019-19281?

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 update named in the vendor’s advisory. We’ve put the advisory first in the list.
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/pdf/ssa-750824.pdf) (Vendor advisory)
- [us-cert.gov](https://www.us-cert.gov/ics/advisories/icsa-20-042-11)

## Questions

### What is CVE-2019-19281?

CVE-2019-19281 is a high-severity flaw in Simatic Et 200sp Open Controller CPU 1515sp Pc2 from Siemens, published on 10 March 2020. 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-2019-19281?

It scores 7.5 out of 10 on the CVSS severity scale, which is high. Our risk score for CVE-2019-19281 is 47 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-2019-19281 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 1.7%. That can change at any time, which is why we keep watching.

### Which versions does CVE-2019-19281 affect?

For Simatic Et 200sp Open Controller CPU 1515sp Pc2 from Siemens: version not specified. The record lists 28 products in all, each with its versions, under "Who is affected" on this page.

### How do I fix CVE-2019-19281?

Install the update the vendor names in its advisory, linked first under "How do I fix" on this page. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet.

## Does CVE-2019-19281 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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