CVE-2025-7770

Predictable Seed in Pseudo-Random Number Generator (PRNG) in Tigo Energy Cloud Connect Advanced

Published Aug 6, 2025 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Description
Tigo Energy's CCA device is vulnerable to insecure session ID generation in their remote API. The session IDs are generated using a predictable method based on the current timestamp, allowing attackers to recreate valid session IDs. When combined with the ability to circumvent session ID requirements for certain commands, this enables unauthorized access to sensitive device functions on connected solar optimization systems.

Remediation

Vendor Workaround

Tigo Energy is aware of these vulnerabilities and is actively working on a fix to address them. Visit Tigo Energy's Help Center for more specific security recommendations.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-23880 Tigo Energy's CCA device is vulnerable to insecure session ID generation in their remote API. The session IDs are generated using a predictable method based on the current timestamp, allowing attackers to recreate valid session IDs. When combined with the ability to circumvent session ID requirements for certain commands, this enables unauthorized access to sensitive device functions on connected solar optimization systems.
History
Type Values Removed Values Added
First Time appeared Tigo Energy
Tigo Energy cloud Connect Advanced
Vendors & Products Tigo Energy
Tigo Energy cloud Connect Advanced
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Tigo Energy's CCA device is vulnerable to insecure session ID generation in their remote API. The session IDs are generated using a predictable method based on the current timestamp, allowing attackers to recreate valid session IDs. When combined with the ability to circumvent session ID requirements for certain commands, this enables unauthorized access to sensitive device functions on connected solar optimization systems.
Title Predictable Seed in Pseudo-Random Number Generator (PRNG) in Tigo Energy Cloud Connect Advanced
Weaknesses CWE-337
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
icscert
Published
Updated
Aug 7, 2025, 2:49 PM
Reserved
Jul 17, 2025, 3:44 PM
Status
Deferred
Published
Aug 6, 2025, 9:15 PM
Modified
Jun 17, 2026, 10:05 AM