Security readout for executives and security teams
Plain-English summary
Ypsomed mylife App and mylife Cloud used weak application-layer encryption in affected versions. Because initialization vectors were not random, an attacker positioned between the app and cloud could tamper with messages. The source bundle does not provide CVSS scoring or evidence of active exploitation.
Executive priority
Treat this as a targeted remediation item for environments using Ypsomed mylife products. Urgency is highest where affected versions remain deployed and communications may traverse untrusted networks. No active exploitation is documented in the supplied sources.
Technical view
CVE-2021-27499 maps to CWE-329: use of non-random IVs in encryption. Affected versions are mylife Cloud before 1.7.2 and mylife App before 1.7.5. The reported impact is message tampering by a man-in-the-middle attacker against app-to-cloud communications.
Likely exposure
Exposure is limited to organizations or users running affected Ypsomed mylife Cloud versions before 1.7.2 or mylife App versions before 1.7.5. The bundle does not identify affected platforms, deployment scale, or network prerequisites beyond man-in-the-middle positioning.
Exploitation context
The cited description supports message tampering by man-in-the-middle attackers. KEV status is false, and the bundle provides no cited evidence of exploitation in the wild, public exploit availability, or weaponized campaigns.
Researcher notes
The available evidence is narrow: affected versions, CWE-329, and man-in-the-middle message tampering. No CVSS vector, detailed protocol analysis, exploit maturity, or vendor mitigation text beyond version thresholds is present in the supplied bundle.
Mitigation direction
- Upgrade mylife Cloud to version 1.7.2 or later.
- Upgrade mylife App to version 1.7.5 or later.
- Check CISA and Ypsomed guidance for deployment-specific remediation instructions.
- Review monitoring for suspicious app-to-cloud communication integrity issues.
Validation and detection
- Inventory deployed Ypsomed mylife Cloud and mylife App versions.
- Confirm Cloud versions are 1.7.2 or later.
- Confirm App versions are 1.7.5 or later.
- Document whether affected versions remain in production or user devices.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-329: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-27499 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://us-cert.cisa.gov/ics/advisories/icsma-21-196-01CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Generation of Predictable IV with CBC Mode
Generation of Predictable IV with CBC Mode represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.