CVE-2024-33895: Cosy+ devices · Use of Hard-coded Credentials
Source CVE Database V5
Not known to be exploited · CVSS 6.6 Medium · fixed in 21.2 : update affected systems when convenient.
Data as of 26 Oct 2026, 17:16 UTC
- EPSS
- 0.5% chance of exploitation in 30 days – higher than 43% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 21.2
CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 2 Aug 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
AI-suggested
- Immediate firmware upgrade to versions 21.2s10 or 22.1s3 or later to ensure unique per-device encryption keys are used.
- Implement strict network segmentation to isolate Cosy+ devices from general IT networks and limit access to trusted personnel and systems only.
- Employ strong network access controls, including VPNs and multi-factor authentication, to reduce unauthorized access risk.
- Regularly audit device configurations and monitor network traffic for unusual access patterns or attempts to retrieve configuration data.
- Establish incident response procedures specific to industrial control system vulnerabilities, including rapid patch deployment and rollback plans.
- Coordinate with device vendors for timely security updates and advisories.
- Train operational technology (OT) staff on the importance of firmware updates and secure device management practices.
- Consider deploying intrusion detection systems tailored for industrial protocols to detect exploitation attempts early.
Description
Cosy+ devices running a firmware 21.x below 21.2s10 or a firmware 22.x below 22.1s3 use a unique key to encrypt the configuration parameters. This is fixed in version 21.2s10 and 22.1s3, the key is now unique per device.
References
- ewon.biz/products/cosy/ewon-cosy-wifi (opens in a new tab)
- hms-networks.com/cyber-security (opens in a new tab)
- hmsnetworks.blob.core.windows.net/nlw/docs/default-source/products/cybersecurity/security-advisory/hms-security-advisory-2024-07-29-001--ewon-several-cosy--vulnerabilities.pdf (opens in a new tab)
- blog.syss.com/posts/hacking-a-secure-industrial-remote-access-gateway/ (opens in a new tab)
- seclists.org/fulldisclosure/2024/Aug/22 (opens in a new tab)