CVE-2026-6643
Authenticated RCE via stack overflow in ADM VPN Client.
Is CVE-2026-6643 being exploited?
Not confirmed. CVE-2026-6643 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 0.47% probability of exploitation in the next 30 days.
How severe is CVE-2026-6643?
CVE-2026-6643 is rated High with a CVSS score of 8.6. 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-2026-6643?
Yes. A fix has been recorded for CVE-2026-6643. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-6643 affect?
CVE-2026-6643 affects ADM VPN Client 4.1.0-4.3.3.RR42, ADM VPN Client 5.0.0-5.1.2.REO1. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-6643?
Upgrade to fixed ADM VPN Client when released
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated RCE via stack overflow in ADM VPN Client; attacker can run code as web server user; no PIE/Stack Canary.
Patch when possible
- affected>= 4.1.0 and <= 4.3.3.RR42
- affected>= 5.0.0 and <= 5.1.2.REO1
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.