# What is CVE-2021-22779?

> CVE-2021-22779 is a critical-severity flaw (CVSS 9.1) in Ecostruxure Control Expert from Schneider-Electric, published on 14 July 2021. 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 1.1%. If you run an affected version, plan in the vendor’s fix.

Canonical page: https://www.precursorintelligence.com/what-is/cve-2021-22779

## 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:** 54 out of 100 (Medium); action: Plan remediation. Kept up to date as the evidence changes.
- **Severity:** Critical (CVSS 9.1 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:** 1.1% (latest exploit-likelihood forecast)
- **Published:** 14 July 2021
- **Record last updated:** 26 July 2021
- **Main product:** Ecostruxure Control Expert from Schneider-Electric
- **Affected products:** 61

## What is CVE-2021-22779? 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 and change data.

### The official description

Authentication Bypass by Spoofing vulnerability exists in EcoStruxure Control Expert (all versions prior to V15.0 SP1, including all versions of Unity Pro), EcoStruxure Control Expert V15.0 SP1, EcoStruxure Process Expert (all versions, including all versions of EcoStruxure Hybrid DCS), SCADAPack RemoteConnect for x70 (all versions), Modicon M580 CPU (all versions - part numbers BMEP* and BMEH*), Modicon M340 CPU (all versions - part numbers BMXP34*), that could cause unauthorized access in read and write mode to the controller by spoofing the Modbus communication between the engineering software and the controller.

### What kind of flaw is it?

- CWE-290: Authentication Bypass by Spoofing

### 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 and change data

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

## Is CVE-2021-22779 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 1.1%. That can change at any time, which is why we keep watching.

Exploit likelihood over the last 7 days: 1.0%, 1.1%, 1.1%, 1.1%, 1.1%, 1.1%, 1.1%.

### Timeline

- 14 July 2021: Published
- 26 July 2021: Record last updated

### How Precursor Intelligence ranks it

CVE-2021-22779 scores **54 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-2021-22779?

The published record lists 61 products. Versions are as published: "before 15.0" means every version up to, but not including, 15.0.

- [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 15.0, 15.0, 15.0-sp1
- [Ecostruxure Process Expert](https://www.precursorintelligence.com/product/schneider-electric/ecostruxure_process_expert) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Application): all versions
- [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): all versions
- [Modicon M340 Bmxp342010](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342010) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M340 Bmxp342010 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342010_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): all versions
- [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): all versions
- [Modicon M340 Bmxp342030](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342030) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M340 Bmxp342030 Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m340_bmxp342030_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): all versions
- [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): all versions
- [Modicon M580 Bmeh582040c](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh582040c) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmeh582040c Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh582040c_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): all versions
- [Modicon M580 Bmeh582040s](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh582040s) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmeh582040s Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh582040s_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): all versions
- [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): all versions
- [Modicon M580 Bmeh584040c](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh584040c) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmeh584040c Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh584040c_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): all versions
- [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): all versions
- [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): all versions
- [Modicon M580 Bmeh586040c](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh586040c) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmeh586040c Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmeh586040c_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): all versions
- [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): all versions
- [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): all versions
- [Modicon M580 Bmep581020h](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep581020h) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmep581020h Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep581020h_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): all versions
- [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): all versions
- [Modicon M580 Bmep582020h](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582020h) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmep582020h Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582020h_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): all versions
- [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): all versions
- [Modicon M580 Bmep582040h](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582040h) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmep582040h Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep582040h_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): all versions
- [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): all versions
- [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): all versions
- [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): all versions
- [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): all versions
- [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): all versions
- [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): all versions
- [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): all versions
- [Modicon M580 Bmep585040c](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep585040c) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmep585040c Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep585040c_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): all versions
- [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): all versions
- [Modicon M580 Bmep586040c](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep586040c) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon M580 Bmep586040c Firmware](https://www.precursorintelligence.com/product/schneider-electric/modicon_m580_bmep586040c_firmware) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Operating system): all versions
- [Remoteconnect](https://www.precursorintelligence.com/product/schneider-electric/remoteconnect) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Application): all versions

## How do I fix CVE-2021-22779?

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

- [download.schneider-electric.com](http://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-194-01) (Vendor advisory)

## Questions

### What is CVE-2021-22779?

CVE-2021-22779 is a critical-severity flaw in Ecostruxure Control Expert from Schneider-Electric, published on 14 July 2021. 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 and change data.

### How serious is CVE-2021-22779?

It scores 9.1 out of 10 on the CVSS severity scale, which is critical. Our risk score for CVE-2021-22779 is 54 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-2021-22779 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 1.1%. That can change at any time, which is why we keep watching.

### Which versions does CVE-2021-22779 affect?

For Ecostruxure Control Expert from Schneider-Electric: before 15.0, 15.0, 15.0-sp1. The record lists 61 products in all, each with its versions, under "Who is affected" on this page.

### How do I fix CVE-2021-22779?

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-2021-22779 affect you?

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- **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.
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