CVE-2021-26887

Katalog CVE

CVSS 7.8 · High EPSS 1,1%

Kerentanan Improper Link Resolution Before File Access ('Link Following') pada microsoft windows 10, microsoft windows 7 +6 lainnya. Skor CVSS 3.1 7.8 (High) menurut microsoft.com.

Deskripsi (NVD)

An elevation of privilege vulnerability exists in Microsoft Windows when Folder redirection has been enabled via Group Policy. When folder redirection file server is co-located with Terminal server, an attacker who successfully exploited the vulnerability would be able to begin redirecting another user's personal data to a created folder. To exploit the vulnerability, an attacker can create a new folder under the Folder Redirection root path and create a junction on a newly created User folder. When the new user logs in, Folder Redirection would start redirecting to the folder and copying personal data. This elevation of privilege vulnerability can only be addressed by reconfiguring Folder Redirection with Offline files and restricting permissions, and NOT via a security update for affected Windows Servers. See the FAQ section of this CVE for configuration guidance.

Rincian

Terbit di NVD

11 Maret 2021

Terakhir diubah

19 Agustus 2026

Status NVD

Modified

CVSS 3.1

7.8 (High), sumber microsoft.com
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-59: Improper Link Resolution Before File Access ('Link Following')

EPSS (30 hari)

1,1% peluang dieksploitasi; lebih tinggi dari 63,5% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26887 patch · advisory vendor
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26887