CVE-2021-27478
No exploitation reported by the sources we read.
- Published2022-05-12
- WeaknessCWE-681
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
A specifically crafted packet sent by an attacker to EIPStackGroup OpENer EtherNet/IP commits and versions prior to Feb 10, 2021 may cause a denial-of-service condition.
Timeline
dates in UTC- 2022-05-1220:15CVE 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-2021-27478?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-27478?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 |
|---|---|---|---|
| 2.3 | ≤ 2.3 | 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
Festo SBRD-Q/SBOC-Q/SBOI-Q
Firmware vers:all/* installed on SBOC-Q-R1B · Firmware vers:all/* installed on SBOC-Q-R1B-S1 · Firmware vers:all/* installed on SBOC-Q-R1C · +17 more
EIPStackGroup OpENer Ethernet/IP
OpENer: versions prior to Feb 10 2021
Fix
- Vendor fix CISA ICSA-21-105-02 · 1 productThe maintainer of OpENer recommends those affected to apply the latest commits available
- Mitigation from the vendor CISA ICSA-25-273-02- Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet. - Deactivate EtherNet/IP in device settings if not used
- No fix planned, says the vendor CISA ICSA-25-273-02There is no fix planned.
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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2022-05-12
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2021-27478?
Is CVE-2021-27478 actively exploited?
What is the CVSS score for CVE-2021-27478?
Running EIPStackGroup OpENer Ethernet/IP? 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 ».
No credit card required · No monthly cap on website lookups · 250 API requests/month
Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
- Running this software? Vulnerability monitoring alerts you to new vulnerabilities in your products.
Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.