AUGUST 4, 2026
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Case File

CVE-2021-20257

MEDIUM · CVSS 6.5 EPSS 0.37% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2022-03-16 · Last synced 2026-08-04

CyberRota Analysis

AI analysis pending.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2021-20257
Severity
MEDIUM
CVSS
6.5
EPSS
0.37%

Original NVD Description

An infinite loop flaw was found in the e1000 NIC emulator of the QEMU. This issue occurs while processing transmits (tx) descriptors in process_tx_desc if various descriptor fields are initialized with invalid values. This flaw allows a guest to consume CPU cycles on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.