CVE-2021-34557

Katalog CVE

CVSS 4.6 · Medium EPSS 0,48%

Kerentanan Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') pada xscreensaver project xscreensaver, fedoraproject fedora. Skor CVSS 3.1 4.6 (Medium) menurut NVD.

Deskripsi (NVD)

XScreenSaver 5.45 can be bypassed if the machine has more than ten disconnectable video outputs. A buffer overflow in update_screen_layout() allows an attacker to bypass the standard screen lock authentication mechanism by crashing XScreenSaver. The attacker must physically disconnect many video outputs.

Rincian

Terbit di NVD

10 Juni 2021

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

4.6 (Medium), sumber NVD
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

EPSS (30 hari)

0,48% peluang dieksploitasi; lebih tinggi dari 39,6% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch patch · advisory pihak ketiga
• http://www.openwall.com/lists/oss-security/2021/06/11/1 mailing list · advisory pihak ketiga
• http://www.openwall.com/lists/oss-security/2021/07/06/2 exploit · mailing list · advisory pihak ketiga
• https://github.com/QubesOS/qubes-issues/issues/6595 issue tracking · advisory pihak ketiga
• https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt exploit · advisory pihak ketiga
• https://www.openwall.com/lists/oss-security/2021/06/05/1 exploit · mailing list · advisory pihak ketiga
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TC4QB7TRS4GS7...