CVE-2026-7839

Katalog CVE

CVSS 9.1 · Critical EPSS 0,66%

Kerentanan Use of Hard-coded Credentials pada uvnc ultravnc. Skor CVSS 3.1 9.1 (Critical) menurut CNA.

Deskripsi (NVD)

UltraVNC repeater through 1.8.2.2 initializes the HTTP administration server with a hardcoded default password. In repeater/webgui/settings.c:197, when settings2.txt is absent on first run the repeater writes the literal string "adminadmi2" as the admin password via strcpy_s(saved_password, 64, "adminadmi2"). The HTTP Basic-auth handler wi_decode_auth() checks this password without rate-limiting or lockout. Any remote attacker who can reach the repeater HTTP port (default TCP 80) can authenticate as administrator using the well-known default credential on a fresh or unmodified installation, gaining full control of the repeater configuration including allow/deny rules and session visibility.

Rincian

Terbit di NVD

1 Juli 2026

Terakhir diubah

9 Juli 2026

Status NVD

Modified

CVSS 3.1

9.1 (Critical), sumber CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-798: Use of Hard-coded Credentials

EPSS (30 hari)

0,66% peluang dieksploitasi; lebih tinggi dari 50,0% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/ultravnc/UltraVNC product
• https://uvnc.com/ product · release notes
• https://www.securin.io/zero-days/cve-2026-7839-hardcoded-default-admin-password-adminadmi2-ultravnc-repeater