CVE-2026-20868
Medium
Elevated severity or exploit probability.
CVSS base
8.8
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
1.4%
71.4th percentile
CISA KEV
Not listed
Weakness / dates
CWE-122
Published 2026-01-13 · modified 2026-07-30
CVSS breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
| Attack Vector | N | Network |
| Attack Complexity | L | Low |
| Privileges Required | N | None |
| User Interaction | R | Required |
| Scope | U | Unchanged |
| Confidentiality | H | High |
| Integrity | H | High |
| Availability | H | High |
Timeline
- 2026-01-13 — Published (NVD)
- 2026-07-30 — Last modified (NVD)
Description
Heap-based buffer overflow in Windows Routing and Remote Access Service (RRAS) allows an unauthorized attacker to execute code over a network.
Affected
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20868
- https://www.vicarius.io/vsociety/posts/cve-2026-20868-detection-script-heap-based-buffer-overflow-vulnerability-affecting-windows-rras
- https://www.vicarius.io/vsociety/posts/cve-2026-20868-mitigation-script-heap-based-buffer-overflow-vulnerability-affecting-windows-rras