# What is CVE-2019-6855?

> CVE-2019-6855 is a high-severity flaw (CVSS 7.3) in Ecostruxure Control Expert from Schneider-Electric, published on 6 January 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 1.0%. If you run an affected version, plan in the vendor’s fix.

Canonical page: https://www.precursorintelligence.com/what-is/cve-2019-6855

## 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:** 46 out of 100 (Medium); action: Plan remediation. Kept up to date as the evidence changes.
- **Severity:** High (CVSS 7.3 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:** 1.0% (latest exploit-likelihood forecast)
- **Published:** 6 January 2020
- **Record last updated:** 31 January 2022
- **Main product:** Ecostruxure Control Expert from Schneider-Electric
- **Affected products:** 44

## What is CVE-2019-6855? 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 some data, change some data and slow it down.

### The official description

Incorrect Authorization vulnerability exists in EcoStruxure Control Expert (all versions prior to 14.1 Hot Fix), Unity Pro (all versions), Modicon M340 (all versions prior to V3.20) , and Modicon M580 (all versions prior to V3.10), which could cause a bypass of the authentication process between EcoStruxure Control Expert and the M340 and M580 controllers.

### What kind of flaw is it?

- CWE-863: Incorrect Authorization

### 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 some data, change some data and slow it down

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

## Is CVE-2019-6855 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 1.0%. That can change at any time, which is why we keep watching.

Exploit likelihood over the last 7 days: 1.0%, 1.0%, 1.0%, 1.0%, 1.0%, 1.0%, 1.0%.

### Timeline

- 6 January 2020: Published
- 31 January 2022: Record last updated

### How Precursor Intelligence ranks it

CVE-2019-6855 scores **46 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-2019-6855?

The published record lists 44 products. Versions are as published: "before 14.1" means every version up to, but not including, 14.1.

- [Ecostruxure Control Expert](https://www.precursorintelligence.com/product/schneider-electric/ecostruxure_control_expert) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Application): before 14.1, 14.1
- [Modicon M340 Bmxp341000](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp341000) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M340 Bmxp341000 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp341000_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.20
- [Modicon M340 Bmxp342000](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342000) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M340 Bmxp342000 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342000_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.20
- [Modicon M340 Bmxp3420102](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp3420102) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M340 Bmxp3420102 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp3420102_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.20
- [Modicon M340 Bmxp342020](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342020) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M340 Bmxp342020 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342020_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.20
- [Modicon M340 Bmxp3420302](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp3420302) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M340 Bmxp3420302 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp3420302_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.20
- [Modicon M580 Bmeh582040](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh582040) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmeh582040 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh582040_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.10
- [Modicon M580 Bmeh584040](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh584040) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmeh584040 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh584040_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.10
- [Modicon M580 Bmeh584040s](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh584040s) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmeh584040s Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh584040s_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.10
- [Modicon M580 Bmeh586040](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh586040) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmeh586040 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh586040_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.10
- [Modicon M580 Bmeh586040s](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh586040s) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmeh586040s Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh586040s_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.10
- [Modicon M580 Bmep581020](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep581020) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmep581020 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep581020_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.10
- [Modicon M580 Bmep582020](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582020) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmep582020 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582020_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.10
- [Modicon M580 Bmep582040](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582040) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmep582040 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582040_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.10
- [Modicon M580 Bmep582040s](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582040s) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmep582040s Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582040s_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.10
- [Modicon M580 Bmep583020](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep583020) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmep583020 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep583020_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.10
- [Modicon M580 Bmep583040](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep583040) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmep583040 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep583040_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.10
- [Modicon M580 Bmep584020](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep584020) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmep584020 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep584020_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.10
- [Modicon M580 Bmep584040](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep584040) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmep584040 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep584040_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.10
- [Modicon M580 Bmep584040s](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep584040s) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmep584040s Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep584040s_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.10
- [Modicon M580 Bmep585040](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep585040) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmep585040 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep585040_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.10
- [Modicon M580 Bmep586040](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep586040) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmep586040 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep586040_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): before 3.10
- [Unity Pro](https://www.precursorintelligence.com/product/schneider-electric/unity_pro) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Application): all versions

## How do I fix CVE-2019-6855?

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

- [se.com](https://www.se.com/ww/en/download/document/SEVD-2019-344-02/) (Vendor advisory)

## Questions

### What is CVE-2019-6855?

CVE-2019-6855 is a high-severity flaw in Ecostruxure Control Expert from Schneider-Electric, published on 6 January 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 read some data, change some data and slow it down.

### How serious is CVE-2019-6855?

It scores 7.3 out of 10 on the CVSS severity scale, which is high. Our risk score for CVE-2019-6855 is 46 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-2019-6855 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 1.0%. That can change at any time, which is why we keep watching.

### Which versions does CVE-2019-6855 affect?

For Ecostruxure Control Expert from Schneider-Electric: before 14.1, 14.1. The record lists 44 products in all, each with its versions, under "Who is affected" on this page.

### How do I fix CVE-2019-6855?

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-2019-6855 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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