CVE-2026-25077
RCE on KVM hosts via default-allowed template uploads in CloudStack.
Is CVE-2026-25077 being exploited?
Not confirmed. CVE-2026-25077 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 0.73% probability of exploitation in the next 30 days.
How severe is CVE-2026-25077?
CVE-2026-25077 is rated High with a CVSS score of 8.8. 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-2026-25077?
Yes. A fix has been recorded for CVE-2026-25077. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-25077 affect?
CVE-2026-25077 affects Apache CloudStack, KVM hypervisor deployments. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-25077?
Upgrade to CloudStack 4.20.3.0 or 4.22.0.1+ immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Arbitrary code execution on KVM hosts via crafted templates; risks data loss, confidentiality/integrity breach, and infrastructure downtime.
Patch when possible
- affected>= 4.11.0 and <= 4.20.2.0
- affected>= 4.21.0.0 and <= 4.22.0.0
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.