Page generated: 11 Nov 2026, 11:33 UTC
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CVE-2021-20023

SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to read an arbitrary file on the remote host.

CVSS 4.9 (MEDIUM) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
8.0/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 4.9: +0.74
  • Fresh EPSS: 51.69%: +0.26

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

Sources: 5 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

Google Cloud
Press · 18 Jul 2023, 07:00 · Stealth Mode: Chinese Cyber Espionage Actors Continue to Evolve Tactics to Avoid Detection - Google Cloud
Check Point Research
Press · 26 Apr 2021, 07:00 · 26th April – Threat Intelligence Report - Check Point Research
TechTarget
Press · 21 Apr 2021, 07:00 · Hackers exploit 3 SonicWall zero-day vulnerabilities - TechTarget
Google Cloud
Press · 20 Apr 2021, 07:00 · Zero-Day Exploits in SonicWall Email Security Lead to Enterprise Compromise | Mandiant - Google Cloud
Google Cloud
Press · 20 Apr 2021, 07:00 · Check Your Pulse: Suspected APT Actors Leverage Authentication Bypass Techniques and Pulse Secure Zero-Day - Google Cloud

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 8.0 (2026-11-02 15:12). The curve appears once the score changes.

Public exploit evidence

0

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 4.9; EPSS 51.7%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, high 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 13:58:22.744333+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
First press mention
20 Apr 2021, 07:00
Published
20 Apr 2021, 11:55
Added to the CISA KEV catalog
03 Nov 2021, 00:00
Latest press mention
18 Jul 2023, 07:00
Score calculated
05 Nov 2026, 13:58