Widely deployed Windows RRAS component; remote code execution via network could affect many servers.
CVE-2026-20868
Heap overflow in RRAS enables remote code execution over network.
Is CVE-2026-20868 being exploited?
Not confirmed. CVE-2026-20868 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 1.4% probability of exploitation in the next 30 days.
How severe is CVE-2026-20868?
CVE-2026-20868 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-2026-20868?
Yes. A fix has been recorded for CVE-2026-20868. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-20868 affect?
CVE-2026-20868 affects Windows Server RRAS component. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-20868?
Patch when available; disable RRAS if not required.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker can run arbitrary code on affected Windows servers by sending crafted RRAS packets.
Immediate action required
- affected>= 10.0.14393.0 and < 10.0.14393.8783
- affected>= 10.0.17763.0 and < 10.0.17763.8276
- affected>= 10.0.19044.0 and < 10.0.19044.6809
- affected>= 10.0.19045.0 and < 10.0.19045.6809
- affected>= 10.0.22631.0 and < 10.0.22631.6491
- affected>= 10.0.22631.0 and < 10.0.22631.6491
- affected>= 10.0.26100.0 and < 10.0.26100.7623
- affected>= 10.0.26200.0 and < 10.0.26200.7623
- affected>= 6.1.7601.0 and < 6.1.7601.28117
- affected>= 6.1.7601.0 and < 6.1.7601.28117
- affected>= 6.0.6003.0 and < 6.0.6003.23717
- affected>= 6.0.6003.0 and < 6.0.6003.23717
- affected>= 6.2.9200.0 and < 6.2.9200.25868
- affected>= 6.3.9600.0 and < 6.3.9600.22968
- affected>= 6.3.9600.0 and < 6.3.9600.22968
- affected>= 6.2.9200.0 and < 6.2.9200.25868
- affected>= 10.0.14393.0 and < 10.0.14393.8783
- affected>= 10.0.14393.0 and < 10.0.14393.8783
- affected>= 10.0.17763.0 and < 10.0.17763.8276
- affected>= 10.0.17763.0 and < 10.0.17763.8276
- affected>= 10.0.20348.0 and < 10.0.20348.4648
- affected>= 10.0.25398.0 and < 10.0.25398.2092
- affected>= 10.0.26100.0 and < 10.0.26100.32230
- affected>= 10.0.26100.0 and < 10.0.26100.32230
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.