CVE-2021-27491Network attack vector

Password-hash disclosure via registration response

Published Jul 30, 2021 · Updated Aug 3, 2024

Insufficiently protected credentials in Ypsomed mylife Cloud before 1.7.2 allow remote attackers to obtain password hashes during registration. The cloud registration response returns the submitted account's password hash to the requester instead of retaining the credential verifier server-side. No authentication or user interaction is required; exposure is limited to credential hashes, with no reported ability to alter therapy data or pump operation.

CVSS severity5.8
Medium
EPSS probability1.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficiently protected credentials in Ypsomed mylife Cloud before 1.7.2 allow remote attackers to obtain password hashes during registration. The cloud registration response returns the submitted account's password hash to the requester instead of retaining the credential verifier server-side. No authentication or user interaction is required; exposure is limited to credential hashes, with no reported ability to alter therapy data or pump operation.

The record

CVE
CVE-2021-27491
Published
Jul 30, 2021
Updated
Aug 3, 2024
Vendor
Ypsomed
Product
mylife Cloud
Classifications
CWE-522
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 30, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Ypsomed mylife Cloud,All versions prior to 1.7.2,Ypsomed mylife App,All versions prior to 1.7.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ypsomed · mylife Cloudversion=Ypsomed mylife Cloud,All versions prior to 1.7.2,Ypsomed mylife App,All versions prior to 1.7.5

Published CVSS scores

5.8CISACVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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