CVE-2021-32623

Katalog CVE

CVSS 6.5 · Medium EPSS 1,3%

Kerentanan Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion') pada apereo opencast. Skor CVSS 3.1 6.5 (Medium) menurut NVD.

Deskripsi (NVD)

Opencast is a free and open source solution for automated video capture and distribution. Versions of Opencast prior to 9.6 are vulnerable to the billion laughs attack, which allows an attacker to easily execute a (seemingly permanent) denial of service attack, essentially taking down Opencast using a single HTTP request. To exploit this, users need to have ingest privileges, limiting the group of potential attackers The problem has been fixed in Opencast 9.6. There is no known workaround for this issue.

Rincian

Terbit di NVD

16 Juni 2021

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

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

Jenis kelemahan (CWE)

CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

EPSS (30 hari)

1,3% peluang dieksploitasi; lebih tinggi dari 68,7% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/opencast/opencast/commit/8ae27da5a6f658011a5741b3210e715b0dc6213e patch · advisory pihak ketiga
• https://github.com/opencast/opencast/security/advisories/GHSA-9gwx-9cwp-5c2m exploit · advisory pihak ketiga