PatchSiren cyber security CVE debrief
CVE-2026-7251 Eppendorf CVE debrief
A critical vulnerability in Eppendorf BioFlo 320 bioreactor systems exposes remote management interfaces to unauthenticated takeover. The embedded VNC server uses a hard-coded password, allowing any remote attacker who can reach the device to gain full administrative control of the bioprocessing unit. The VNC traffic is transmitted without encryption, compounding exposure to credential theft and session hijacking. This vulnerability is particularly severe in life sciences and pharmaceutical manufacturing environments where BioFlo 320 units are deployed for cell culture and fermentation processes.
- Vendor
- Eppendorf
- Product
- BioFlo 320
- CVSS
- CRITICAL 9.3
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-05-26
- Original CVE updated
- 2026-05-26
- Advisory published
- 2026-05-26
- Advisory updated
- 2026-05-26
Who should care
Biotechnology and pharmaceutical manufacturing security teams, OT/ICS security engineers, life sciences facility operators, bioprocess engineers, and CISOs in organizations using Eppendorf bioreactor systems for GMP or research applications
Technical summary
The BioFlo 320's embedded VNC server authenticates using a static, hard-coded password (CWE-259: Use of Hard-coded Password). Remote attackers with network reachability to the device can authenticate without credentials and obtain complete control over the bioreactor's user interface. The VNC protocol operates without encryption, exposing session traffic to passive interception. Successful exploitation grants attackers full access to process control parameters, potentially disrupting bioproduction batches or manipulating critical fermentation conditions.
Defensive priority
critical
Recommended defensive actions
- Immediately inventory all BioFlo 320 units with remote access enabled and restrict network exposure to isolated management segments
- Apply firmware updates from Eppendorf when available per ICSMA-26-146-01 guidance
- Disable remote VNC access on affected units if operational requirements permit
- Monitor for unauthorized VNC connections (TCP/5900) to BioFlo 320 management interfaces
- Implement network segmentation to prevent lateral movement from compromised bioreactor controls
Evidence notes
CISA ICS Medical Advisory ICSMA-26-146-01 documents hard-coded VNC credentials (CWE-259) in BioFlo 320 firmware. CVSS 4.0 vector confirms network attack vector with no privileges required. Vendor attribution to Eppendorf derived from CISA advisory references and product naming in source corpus; marked for review due to 'Unknown Vendor' classification in enrichment data.
Official resources
2026-05-26