# What is CVE-2021-22792?

> CVE-2021-22792 is a high-severity flaw (CVSS 7.5) in Modicon M340 Bmxp341000 from Schneider-Electric, published on 2 September 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 0.9%. If you run an affected version, plan in the vendor’s fix.

Canonical page: https://www.precursorintelligence.com/what-is/cve-2021-22792

## 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:** 0.9% (latest exploit-likelihood forecast)
- **Published:** 2 September 2021
- **Record last updated:** 13 September 2021
- **Main product:** Modicon M340 Bmxp341000 from Schneider-Electric
- **Affected products:** 49

## What is CVE-2021-22792? 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 CWE-476: NULL Pointer Dereference vulnerability that could cause a Denial of Service on the Modicon PLC controller / simulator when updating the controller application with a specially crafted project file exists in Modicon M580 CPU (part numbers BMEP* and BMEH*, all versions), Modicon M340 CPU (part numbers BMXP34*, all versions), Modicon MC80 (part numbers BMKC80*, all versions), Modicon Momentum Ethernet CPU (part numbers 171CBU*, all versions), PLC Simulator for EcoStruxureª Control Expert, including all Unity Pro versions (former name of EcoStruxureª Control Expert, all versions), PLC Simulator for EcoStruxureª Process Expert including all HDCS versions (former name of EcoStruxureª Process Expert, all versions), Modicon Quantum CPU (part numbers 140CPU*, all versions), Modicon Premium CPU (part numbers TSXP5*, all versions).

### What kind of flaw is it?

- CWE-476: NULL Pointer Dereference

### 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-2021-22792 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 0.9%. That can change at any time, which is why we keep watching.

Exploit likelihood over the last 7 days: 0.9%, 0.9%, 0.9%, 0.9%, 0.9%, 0.9%, 0.9%.

### Timeline

- 2 September 2021: Published
- 13 September 2021: Record last updated

### How Precursor Intelligence ranks it

CVE-2021-22792 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-2021-22792?

The published record lists 49 products.

- [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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 Mc80 Bmkc8020301](https://www.precursorintelligence.com/product/schneider-electric/modicon_mc80_bmkc8020301) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon Mc80 Bmkc8020310](https://www.precursorintelligence.com/product/schneider-electric/modicon_mc80_bmkc8020310) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon Mc80 Bmkc8030311](https://www.precursorintelligence.com/product/schneider-electric/modicon_mc80_bmkc8030311) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon Momentum 171cbu78090](https://www.precursorintelligence.com/product/schneider-electric/modicon_momentum_171cbu78090) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon Momentum 171cbu98090](https://www.precursorintelligence.com/product/schneider-electric/modicon_momentum_171cbu98090) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon Momentum 171cbu98091](https://www.precursorintelligence.com/product/schneider-electric/modicon_momentum_171cbu98091) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon Premium Tsxp57 1634m](https://www.precursorintelligence.com/product/schneider-electric/modicon_premium_tsxp57_1634m) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon Premium Tsxp57 2634m](https://www.precursorintelligence.com/product/schneider-electric/modicon_premium_tsxp57_2634m) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon Premium Tsxp57 2834m](https://www.precursorintelligence.com/product/schneider-electric/modicon_premium_tsxp57_2834m) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon Premium Tsxp57 454m](https://www.precursorintelligence.com/product/schneider-electric/modicon_premium_tsxp57_454m) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon Premium Tsxp57 4634m](https://www.precursorintelligence.com/product/schneider-electric/modicon_premium_tsxp57_4634m) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon Premium Tsxp57 554m](https://www.precursorintelligence.com/product/schneider-electric/modicon_premium_tsxp57_554m) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon Premium Tsxp57 5634m](https://www.precursorintelligence.com/product/schneider-electric/modicon_premium_tsxp57_5634m) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon Premium Tsxp57 6634m](https://www.precursorintelligence.com/product/schneider-electric/modicon_premium_tsxp57_6634m) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon Quantum 140cpu65150](https://www.precursorintelligence.com/product/schneider-electric/modicon_quantum_140cpu65150) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon Quantum 140cpu65150c](https://www.precursorintelligence.com/product/schneider-electric/modicon_quantum_140cpu65150c) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon Quantum 140cpu65160](https://www.precursorintelligence.com/product/schneider-electric/modicon_quantum_140cpu65160) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [Modicon Quantum 140cpu65160c](https://www.precursorintelligence.com/product/schneider-electric/modicon_quantum_140cpu65160c) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [PLC Simulator for Ecostruxure Control Expert](https://www.precursorintelligence.com/product/schneider-electric/plc_simulator_for_ecostruxure_control_expert) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified
- [PLC Simulator for Ecostruxure Process Expert](https://www.precursorintelligence.com/product/schneider-electric/plc_simulator_for_ecostruxure_process_expert) by [Schneider-Electric](https://www.precursorintelligence.com/vendors/schneider-electric) (Hardware): version not specified

## How do I fix CVE-2021-22792?

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](https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-222-04) (Patch, Vendor advisory)
- [download.schneider-electric.com](https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-222-07) (Not applicable)

## Questions

### What is CVE-2021-22792?

CVE-2021-22792 is a high-severity flaw in Modicon M340 Bmxp341000 from Schneider-Electric, published on 2 September 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 take it offline.

### How serious is CVE-2021-22792?

It scores 7.5 out of 10 on the CVSS severity scale, which is high. Our risk score for CVE-2021-22792 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-2021-22792 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 0.9%. That can change at any time, which is why we keep watching.

### Which versions does CVE-2021-22792 affect?

For Modicon M340 Bmxp341000 from Schneider-Electric: version not specified. The record lists 49 products in all, each with its versions, under "Who is affected" on this page.

### How do I fix CVE-2021-22792?

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-2021-22792 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.
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