CVE Program Container

Answer in brief

CVE-2021-20023 records a High severity (CVSS 4.9) vulnerability in CVE Program Container. The current sources mark it as known exploited. The current feed maps SonicWall/Email Security (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 20, 2021Updated Aug 12, 2026Source checked Sep 19, 2026First seen by HOL May 24, 2026Material review Aug 12, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 4.9
Exploitation: Known exploited
Affected software: 21 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

CVSS is 4.9. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps SonicWall/Email Security (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:a:sonicwall:email_security::::::::	Not reported	Not reported
cpe:2.3:a:sonicwall:email_security_virtual_appliance::::::::	Not reported	Not reported
cpe:2.3:a:sonicwall:hosted_email_security::::::::	Not reported	Not reported
cpe:2.3:h:sonicwall:email_security_appliance_3300:-:::::::*	Not reported	Not reported
cpe:2.3:h:sonicwall:email_security_appliance_4300:-:::::::*	Not reported	Not reported
cpe:2.3:h:sonicwall:email_security_appliance_5000:-:::::::*	Not reported	Not reported
cpe:2.3:h:sonicwall:email_security_appliance_5050:-:::::::*	Not reported	Not reported
cpe:2.3:h:sonicwall:email_security_appliance_7000:-:::::::*	Not reported	Not reported
cpe:2.3:h:sonicwall:email_security_appliance_7050:-:::::::*	Not reported	Not reported
cpe:2.3:h:sonicwall:email_security_appliance_8300:-:::::::*	Not reported	Not reported
cpe:2.3:h:sonicwall:email_security_appliance_9000:-:::::::*	Not reported	Not reported
cpe:2.3:o:microsoft:windows:-:::::::*	Not reported	Not reported
cpe:2.3:o:sonicwall:email_security_appliance_3300_firmware::::::::	Not reported	Not reported
cpe:2.3:o:sonicwall:email_security_appliance_4300_firmware::::::::	Not reported	Not reported
cpe:2.3:o:sonicwall:email_security_appliance_5000_firmware::::::::	Not reported	Not reported
cpe:2.3:o:sonicwall:email_security_appliance_5050_firmware::::::::	Not reported	Not reported
cpe:2.3:o:sonicwall:email_security_appliance_7000_firmware::::::::	Not reported	Not reported
cpe:2.3:o:sonicwall:email_security_appliance_7050_firmware::::::::	Not reported	Not reported
cpe:2.3:o:sonicwall:email_security_appliance_8300_firmware::::::::	Not reported	Not reported
cpe:2.3:o:sonicwall:email_security_appliance_9000_firmware::::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
SonicWall/Email Securitygeneric	10.0.9 and earlier	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for SonicWall/Email Security.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Apr 20, 2021
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 12, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
May 24, 2026
Added to CISA KEV
Nov 3, 2021
Evidence: source:kev:kev:kev:record

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.