CVE-2026-25656
RCE via DLL hijacking in SINEC NMS UMC (<2.15.2.1)
Is CVE-2026-25656 being exploited?
Not confirmed. CVE-2026-25656 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.25% probability of exploitation in the next 30 days.
How severe is CVE-2026-25656?
CVE-2026-25656 is rated High with a CVSS score of 8.5. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-25656?
Yes. A fix has been recorded for CVE-2026-25656. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-25656 affect?
CVE-2026-25656 affects SINEC NMS UMC < 2.15.2.1. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-25656?
Patch to 2.15.2.1+; restrict UMC config write access.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
SYSTEM-level code execution via DLL hijacking triggered by config changes by a low-privilege user.
Immediate action required
- affected< V4.0 SP3
- affected< V2.15.2.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.