CVE-2021-22659 (GCVE-0-2021-22659)

Vulnerability from cvelistv5 – Published: 2021-03-25 15:59 – Updated: 2026-06-03 13:10
VLAI
Summary
Rockwell Automation MicroLogix 1400 Version 21.6 and below may allow a remote unauthenticated attacker to send a specially crafted Modbus packet allowing the attacker to retrieve or modify random values in the register. If successfully exploited, this may lead to a buffer overflow resulting in a denial-of-service condition. The FAULT LED will flash RED and communications may be lost. Recovery from denial-of-service condition requires the fault to be cleared by the user.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-03 13:09 UTC
CWE
  • CWE-120 - CLASSIC BUFFER OVERFLOW CWE-120
Assigner
References
Impacted products
Vendor Product Version CPE status
n/a Rockwell Automation MicroLogix 1400 Affected: MicroLogix 1400, All series Version 21.6 and below
Show details on NVD website
To clipboard 

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              "url": "https://us-cert.cisa.gov/ics/advisories/icsa-21-033-01"
            },
            {
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1129877/loc/en_US#__highlight"
            }
          ],
          "x_legacyV4Record": {
            "CVE_data_meta": {
              "ASSIGNER": "ics-cert@hq.dhs.gov",
              "ID": "CVE-2021-22659",
              "STATE": "PUBLIC"
            },
            "affects": {
              "vendor": {
                "vendor_data": [
                  {
                    "product": {
                      "product_data": [
                        {
                          "product_name": "Rockwell Automation MicroLogix 1400",
                          "version": {
                            "version_data": [
                              {
                                "version_value": "MicroLogix 1400, All series Version 21.6 and below"
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            "data_type": "CVE",
            "data_version": "4.0",
            "description": {
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                {
                  "lang": "eng",
                  "value": "Rockwell Automation MicroLogix 1400 Version 21.6 and below may allow a remote unauthenticated attacker to send a specially crafted Modbus packet allowing the attacker to retrieve or modify random values in the register. If successfully exploited, this may lead to a buffer overflow resulting in a denial-of-service condition. The FAULT LED will flash RED and communications may be lost. Recovery from denial-of-service condition requires the fault to be cleared by the user."
                }
              ]
            },
            "problemtype": {
              "problemtype_data": [
                {
                  "description": [
                    {
                      "lang": "eng",
                      "value": "CLASSIC BUFFER OVERFLOW CWE-120"
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            "references": {
              "reference_data": [
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                  "name": "https://us-cert.cisa.gov/ics/advisories/icsa-21-033-01",
                  "refsource": "MISC",
                  "url": "https://us-cert.cisa.gov/ics/advisories/icsa-21-033-01"
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      "cveMetadata": {
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        "assignerShortName": "icscert",
        "cveId": "CVE-2021-22659",
        "datePublished": "2021-03-25T15:59:07.000Z",
        "dateReserved": "2021-01-05T00:00:00.000Z",
        "dateUpdated": "2026-06-03T13:10:07.459Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.