CVE-2021-27475
No exploitation reported by the sources we read.
- Published2022-03-23
- WeaknessCWE-502
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
Rockwell Automation Connected Components Workbench v12.00.00 and prior does not limit the objects that can be deserialized. This vulnerability allows attackers to craft a malicious serialized object that, if opened by a local user in Connected Components Workbench, may result in remote code execution. This vulnerability requires user interaction to be successfully exploited.
Timeline
dates in UTC- 2022-03-2320:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-27475?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-27475?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 12.0 | ≤ 12.00.00 | no fix published | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
Rockwell Automation Connected Components Workbench
Connected Components Workbench: v12.00.00 and prior
Fix
- Vendor fix CISA ICSA-21-133-01 · 1 productRockwell Automation recommends users of the affected software update to an available software revision (Connected Components Workbench v13.00.00 or later) that addresses the associated risk. Users who are unable to update are directed towards risk mitigation strategies provided below, and are encou…
- Vendor fix CISA ICSA-21-133-01 · 1 productRun Connected Components Workbench as a User, not as an Administrator, to minimize the impact of malicious code on the infected system.
- Vendor fix CISA ICSA-21-133-01 · 1 productDo not open untrusted .ccwarc, files with Connected Components Workbench. Employ training and awareness programs to educate users on the warning signs of a phishing or social engineering attack.
- Mitigation from the vendor CISA ICSA-21-133-01 · 1 productUse of Microsoft AppLocker or other similar allow list applications can help mitigate risk. Information on using AppLocker with Rockwell Automation products is available at KnowledgeBase Article QA17329 (login required).
- Mitigation from the vendor CISA ICSA-21-133-01 · 1 productEnsure the least-privilege user principle is followed, and user/service account access to shared resources (such as a database) is only granted with a minimum number of rights as needed.
- Mitigation from the vendor CISA ICSA-21-133-01 · 1 productFor more information, please see the industrial security advisory from Rockwell Automation.
Advisories and patches
- rockwellautomation.custhelp.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
- Published
- 2022-03-23
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2021-27475?
Is CVE-2021-27475 actively exploited?
What is the CVSS score for CVE-2021-27475?
Running Rockwell Automation Connected? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.