# What is CVE-2019-10922?

> CVE-2019-10922 is a critical-severity flaw (CVSS 9.8) in Simatic Pcs 7 from Siemens, published on 14 May 2019. 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 2.6%. If you run an affected version, plan in the vendor’s fix.

Canonical page: https://www.precursorintelligence.com/what-is/cve-2019-10922

## At a glance

- **Verdict:** Fix this soon. Not confirmed as exploited yet, but serious or likely enough that it should not wait for a quiet month.
- **Precursor Intelligence risk score:** 55 out of 100 (Medium); action: Plan remediation. Kept up to date as the evidence changes.
- **Severity:** Critical (CVSS 9.8 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:** 2.6% (latest exploit-likelihood forecast)
- **Published:** 14 May 2019
- **Record last updated:** 2 October 2020
- **Main product:** Simatic Pcs 7 from Siemens
- **Affected products:** 2

## What is CVE-2019-10922? 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 read data, change data and take it offline.

### The official description

A vulnerability has been identified in SIMATIC PCS 7 V8.0 and earlier (All versions), SIMATIC PCS 7 V8.1 and newer (All versions), SIMATIC WinCC V7.2 and earlier (All versions), SIMATIC WinCC V7.3 and newer (All versions). An attacker with network access to affected installations, which are configured without "Encrypted Communication", can execute arbitrary code. The security vulnerability could be exploited by an unauthenticated attacker with network access to the affected installation. No user interaction is required to exploit this security vulnerability. The vulnerability impacts confidentiality, integrity, and availability of the device. At the time of advisory publication no public exploitation of this security vulnerability was known.

### What kind of flaw is it?

- CWE-306: Missing Authentication for Critical Function

### 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 read data, change data and take it offline

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

## Is CVE-2019-10922 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 2.6%. That can change at any time, which is why we keep watching.

Exploit likelihood over the last 7 days: 2.6%, 2.6%, 2.6%, 2.6%, 2.6%, 2.6%, 2.6%.

### Timeline

- 14 May 2019: Published
- 2 October 2020: Record last updated

### How Precursor Intelligence ranks it

CVE-2019-10922 scores **55 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-2019-10922?

The published record lists 2 products.

- [Simatic Pcs 7](https://www.precursorintelligence.com/product/siemens/simatic_pcs_7) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): up to 8.0, 8.1 and later
- [Simatic Wincc](https://www.precursorintelligence.com/product/siemens/simatic_wincc) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Application): up to 7.2, 7.3 and later

## How do I fix CVE-2019-10922?

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-705517.pdf) (Mitigation, Vendor advisory)
- [securityfocus.com](http://www.securityfocus.com/bid/108398) (Third-party advisory, Vulnerability database)

## Questions

### What is CVE-2019-10922?

CVE-2019-10922 is a critical-severity flaw in Simatic Pcs 7 from Siemens, published on 14 May 2019. It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can read data, change data and take it offline.

### How serious is CVE-2019-10922?

It scores 9.8 out of 10 on the CVSS severity scale, which is critical. Our risk score for CVE-2019-10922 is 55 out of 100, which is Medium. Its action is "Plan remediation". Not confirmed as exploited yet, but serious or likely enough that it should not wait for a quiet month.

### Is CVE-2019-10922 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 2.6%. That can change at any time, which is why we keep watching.

### Which versions does CVE-2019-10922 affect?

For Simatic Pcs 7 from Siemens: up to 8.0, 8.1 and later. The record lists 2 products in all, each with its versions, under "Who is affected" on this page.

### How do I fix CVE-2019-10922?

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-2019-10922 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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