VulnRadar

Data against noise.

Page generated: 08 Nov 2026, 12:35 UTC

CVE-2023-27992

The pre-authentication command injection vulnerability in the Zyxel NAS326 firmware versions prior to V5.21(AAZF.14)C0, NAS540 firmware versions prior to V5.21(AATB.11)C0, and NAS542 firmware versions prior to V5.21(ABAG.11)C0 could allow an unauthenticated attacker to execute so…

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CVSS 9.8 (CRITICAL) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE

0.0/10

REALITY · THREAT PRIORITY

8.9/10

General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?

Recorded exploitation baseline: +7.00
Technical severity: CVSS 9.8: +1.47
Fresh EPSS: 82.26%: +0.41

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 6 documents and public datasets.

Hype components

Headline sample (25%)

0/100

Press, 30 days (60%)

0/100

Grounded branding (15%)

0/100

HYPE TOTAL0/100

Sources and documents

IBM

Press · 03 Apr 2025, 20:22 · IBM identifies zero-day vulnerability in Zyxel NAS devices - IBM

Check Point Research

Press · 26 Jun 2023, 07:00 · 26th June – Threat Intelligence Report - Check Point Research

SecurityWeek

Press · 26 Jun 2023, 07:00 · CISA Says Critical Zyxel NAS Vulnerability Exploited in Attacks - SecurityWeek

CCB Belgium

Press · 22 Jun 2023, 07:00 · Zyxel Has Released Patches Addressing a Pre-Authentication Command Injection Vulnerability in Some NAS Versions - CCB Belgium

TechSpot

Press · 21 Jun 2023, 07:00 · Critical security flaw discovered in Zyxel NAS devices, patches are already available - TechSpot

See all 6 source documents

BleepingComputer

Press · 20 Jun 2023, 07:00 · Zyxel warns of critical command injection flaw in NAS devices - BleepingComputer

Score evolution

● Hype ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 8.9 (2026-11-02 15:13). The curve appears once the score changes.

Public exploit evidence

Public exploit entries / repo candidates

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence: Exploitation recorded
Priority basis: Recorded exploitation; CVSS 9.8; EPSS 82.3%
Attention, last 30 days: 0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential: network access, no prior privileges, no user interaction.
Observed activity: Exploitation recorded in CISA KEV.
Known scale: Not quantified.
Evidence confidence basis: Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:58:52.927189+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline

Published

19 Jun 2023, 11:42

First press mention

20 Jun 2023, 07:00

Added to the CISA KEV catalog

23 Jun 2023, 00:00

Latest press mention

03 Apr 2025, 20:22

Score calculated

05 Nov 2026, 13:58