CVE-2021-20235

Katalog CVE

CVSS 8.1 · High EPSS 43,9%

Kerentanan Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') pada zeromq libzmq. Skor CVSS 3.1 8.1 (High) menurut NVD.

Deskripsi (NVD)

There's a flaw in the zeromq server in versions before 4.3.3 in src/decoder_allocators.hpp. The decoder static allocator could have its sized changed, but the buffer would remain the same as it is a static buffer. A remote, unauthenticated attacker who sends a crafted request to the zeromq server could trigger a buffer overflow WRITE of arbitrary data if CURVE/ZAP authentication is not enabled. The greatest impact of this flaw is to application availability, data integrity, and confidentiality.

Rincian

Terbit di NVD

1 April 2021

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

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

Jenis kelemahan (CWE)

CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-787: Out-of-bounds Write

EPSS (30 hari)

43,9% peluang dieksploitasi; lebih tinggi dari 98,7% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://bugzilla.redhat.com/show_bug.cgi?id=1921983 issue tracking · patch · advisory pihak ketiga
• https://github.com/zeromq/libzmq/security/advisories/GHSA-fc3w-qxf5-7hp6 patch · advisory pihak ketiga