CVE-2025-7770: Predictable Seed in Pseudo-Random Number Generator (PRNG) in Tigo Energy Cloud Connect Advanced

Severity: high (CVSS 8.7 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-08-06 · updated 2026-06-17
Weakness: CWE-337

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.

Affected products

Tigo Energy Cloud Connect Advanced: through 4.0.1

References

https://www.cisa.gov/news-events/ics-advisories/icsa-25-217-02

Get alerted when CVE-2025-7770 or the next vulnerability affects your stack