CVE-2021-4479
CVE-2021-4479 is a medium-severity vulnerability with a CVSS 3.x base score of 4.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1286.
Key facts
- Severity: Medium (CVSS 3.x base score 4.0)
- CVSS v4: 6.3
- EPSS exploit prediction: 0% (15th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2021-34845
- Weakness: CWE-1286
- Published:
- Last modified:
Description
Dräger Atlan A350 versions 1.00 up to and including 1.01 contains an improper input handling vulnerability that allows attackers to cause a denial of service by sending specifically crafted non-Medibus-compliant data through the Medibus interface. Attackers can transmit malformed data to overload the internal processor, gradually disrupting device operation over several hours and causing loss of data transmission, delayed display of real-time curves, and deviation between displayed airway pressure values and screen curves.
Frequently asked questions
- What is CVE-2021-4479?
- Dräger Atlan A350 versions 1.00 up to and including 1.01 contains an improper input handling vulnerability that allows attackers to cause a denial of service by sending specifically crafted non-Medibus-compliant data through the Medibus interface. Attackers can transmit malformed data to overload the internal processor, gradually disrupting device operation over several hours and causing loss of data transmission, delayed display of real-time curves, and deviation between displayed airway pressure values and screen curves.
- How severe is CVE-2021-4479?
- CVE-2021-4479 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
- Is CVE-2021-4479 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2021-4479?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2021-4479 have an EU (EUVD) identifier?
- Yes. CVE-2021-4479 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-34845.
- When was CVE-2021-4479 published?
- CVE-2021-4479 was published on 2026-06-02 and last updated on 2026-06-17.
References
- https://static.draeger.com/security/download/2021-05-04-PSA-21-124-1-Security-Advisory-Atlan.pdf
- https://www.vulncheck.com/advisories/drager-atlan-a350-dos-via-medibus-interface
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