Vulnerability-Lookup

FKIE_CVE-2021-42237

Vulnerability from fkie_nvd - Published: 2021-11-05 10:15 - Updated: 2026-07-09 13:57

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

Sitecore XP 7.5 Initial Release to Sitecore XP 8.2 Update-7 is vulnerable to an insecure deserialization attack where it is possible to achieve remote command execution on the machine. No authentication or special configuration is required to exploit this vulnerability.

References

URL	Tags
cve@mitre.org	http://packetstormsecurity.com/files/164988/Sitecore-Experience-Platform-XP-Remote-Code-Execution.html	Third Party Advisory, VDB Entry
cve@mitre.org	https://blog.assetnote.io/2021/11/02/sitecore-rce/	Exploit, Third Party Advisory
cve@mitre.org	https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1000776	Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	http://packetstormsecurity.com/files/164988/Sitecore-Experience-Platform-XP-Remote-Code-Execution.html	Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108	https://blog.assetnote.io/2021/11/02/sitecore-rce/	Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1000776	Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42237	US Government Resource

Impacted products

Vendor	Product	Version
sitecore	experience_platform	7.5
sitecore	experience_platform	7.5
sitecore	experience_platform	7.5
sitecore	experience_platform	8.0
sitecore	experience_platform	8.0
sitecore	experience_platform	8.0
sitecore	experience_platform	8.0
sitecore	experience_platform	8.0
sitecore	experience_platform	8.0
sitecore	experience_platform	8.0
sitecore	experience_platform	8.0
sitecore	experience_platform	8.0
sitecore	experience_platform	8.1
sitecore	experience_platform	8.1
sitecore	experience_platform	8.1
sitecore	experience_platform	8.1
sitecore	experience_platform	8.2
sitecore	experience_platform	8.2
sitecore	experience_platform	8.2
sitecore	experience_platform	8.2
sitecore	experience_platform	8.2
sitecore	experience_platform	8.2
sitecore	experience_platform	8.2
sitecore	experience_platform	8.2

JSON

To clipboard

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CVE-2021-42237 (GCVE-0-2021-42237)

Vulnerability from cvelistv5 – Published: 2021-11-05 09:51 – Updated: 2026-07-09 00:15

Summary

Severity

9.8 (Critical)


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

SSVC

Exploitation: active Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-02-03 14:09 UTC

CWE

n/a
CWE-502 - Deserialization of Untrusted Data

Assigner

mitre mitre root

References

4 references

URL	Tags
https://support.sitecore.com/kb?id=kb_article_vie…
https://blog.assetnote.io/2021/11/02/sitecore-rce/
http://packetstormsecurity.com/files/164988/Sitec…
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource

Show details on NVD website

JSON

To clipboard

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            },
            {
              "name": "http://packetstormsecurity.com/files/164988/Sitecore-Experience-Platform-XP-Remote-Code-Execution.html",
              "refsource": "MISC",
              "url": "http://packetstormsecurity.com/files/164988/Sitecore-Experience-Platform-XP-Remote-Code-Execution.html"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2021-42237",
    "datePublished": "2021-11-05T09:51:18.000Z",
    "dateReserved": "2021-10-11T00:00:00.000Z",
    "dateUpdated": "2026-07-09T00:15:11.203Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.