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CVE-2026-20868

HIGHCVSS 8.8/10EPSS 1.34%

Last modified

CVE-2026-20868 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Heap-based buffer overflow in Windows Routing and Remote Access Service (RRAS) allows an unauthorized attacker to execute code over a network.. EPSS estimates a 1.34% chance of exploitation in the next 30 days.

Description

Heap-based buffer overflow in Windows Routing and Remote Access Service (RRAS) allows an unauthorized attacker to execute code over a network.

Metrics

CVSS 3.1
8.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability
1.34%

67.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
MicrosoftWindows 10 1607< 10.0.14393.8783—
MicrosoftWindows 10 1809< 10.0.17763.8276—
MicrosoftWindows 10 21h2< 10.0.19044.6809—
MicrosoftWindows 10 22h2< 10.0.19045.6809—
MicrosoftWindows 11 23h2< 10.0.22631.6491—
MicrosoftWindows 11 24h2< 10.0.26100.7623—
MicrosoftWindows 11 25h2< 10.0.26200.7623—
MicrosoftWindows Server 2008All versionsSp2
MicrosoftWindows Server 2008r2Sp1
MicrosoftWindows Server 2012All versions—
MicrosoftWindows Server 2012r2—
MicrosoftWindows Server 2016< 10.0.14393.8783—
MicrosoftWindows Server 2019< 10.0.17763.8276—
MicrosoftWindows Server 2022< 10.0.20348.4648—
MicrosoftWindows Server 2022 23h2< 10.0.25398.2092—
MicrosoftWindows Server 2025< 10.0.26100.32230—

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2026-20868?
Heap-based buffer overflow in Windows Routing and Remote Access Service (RRAS) allows an unauthorized attacker to execute code over a network.
How severe is CVE-2026-20868?
CVE-2026-20868 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.34% probability of exploitation in the next 30 days.
How do I fix CVE-2026-20868?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-20868?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST