AUGUST 4, 2026
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Case File

CVE-2021-28484

HIGH · CVSS 7.5 EPSS 1.52% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-04-14 · 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-2021-28484
Severity
HIGH
CVSS
7.5
EPSS
1.52%

Original NVD Description

An issue was discovered in the /api/connector endpoint handler in Yubico yubihsm-connector before 3.0.1 (in YubiHSM SDK before 2021.04). The handler did not validate the length of the request, which can lead to a state where yubihsm-connector becomes stuck in a loop waiting for the YubiHSM to send it data, preventing any further operations until the yubihsm-connector is restarted. An attacker can send 0, 1, or 2 bytes to trigger this.