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NVD / CVE Program· CNA sonicwall

CVE-2021-20022: SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to upload an arbitrary file to

Noroxi assessment

Priority: This week (action score 63/100)

  • CISA has confirmed exploitation in the wild (Nov 3, 2021); it is known to be used in ransomware campaigns. Remediation deadline for US federal agencies: Nov 17, 2021.
  • Probability of exploitation in the next 30 days: 16.6% (FIRST EPSS); higher than 97% of all records.
  • Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • According to the record, no fixed version is available yet.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Don’t wait for the next maintenance window. Until a fix is released, restrict access to the affected component and follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

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

HighCVSS 7.2 · v3.1KEVWeaponized No fix recorded
Published
Apr 9, 2021
Updated
Oct 1, 2026
EPSS
16.6% · 97th percentile

Report tools

JSON

Action score

63

This week

Don’t wait for the next maintenance window.

CVSS
28 / 40 · 7.2 / 10
CISA KEV
30 / 30 · Listed
EPSS
5 / 30 · 16.6%

CISA SSVC decision

Exploitation
active
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.2
CNA · sonicwall
7.2
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Nov 3, 2021. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Nov 17, 2021.

Known to be used in ransomware campaigns.

Get told when this record changes

  • In CISA KEV: exploitation in the wild confirmed
  • Weaponized exploit exists
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-20022

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
sonicwallemail security
sonicwallemail security appliance 9000 firmware
sonicwallemail security appliance 9000
sonicwallemail security appliance 3300 firmware
sonicwallemail security appliance 3300
sonicwallemail security appliance 4300 firmware
sonicwallemail security appliance 4300
sonicwallemail security appliance 8300 firmware
sonicwallemail security appliance 8300
sonicwallemail security appliance 5000 firmware
sonicwallemail security appliance 5000
sonicwallemail security appliance 7000 firmware

and 8 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • sonicwall email securitybefore 10.0.9.6103
  • sonicwall email security appliance 3300 firmwarebefore 10.0.9.6105
  • sonicwall email security appliance 4300 firmwarebefore 10.0.9.6105
  • sonicwall email security appliance 5000 firmwarebefore 10.0.9.6105
  • sonicwall email security appliance 5050 firmwarebefore 10.0.9.6105
  • sonicwall email security appliance 7000 firmwarebefore 10.0.9.6105
  • sonicwall email security appliance 7050 firmwarebefore 10.0.9.6105
  • sonicwall email security appliance 8300 firmwarebefore 10.0.9.6105
  • sonicwall email security appliance 9000 firmwarebefore 10.0.9.6105
  • sonicwall email security virtual appliancebefore 10.0.9.6105
  • sonicwall hosted email securitybefore 10.0.9.6103

Versions reported by the vendor

Affected version ranges reported by the assigning authority (sonicwall). Independent of NVD's CPE analysis and usually ahead of it.

  • SonicWall Email Security

    • 10.0.9 and earlieraffected

Same product

sonicwall: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-20021A vulnerability in the SonicWall Email Security version 10.0.9.x allows an attacker to create an administrative account by sending a craftedKEV
    96Now
  • CVE-2021-20023SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to read an arbitrary file on thKEV
    65This week
  • CVE-2026-66150Improper Control of Generation of Code ('Code Injection') Vulnerability in the SonicWall Email Security appliance allows an authenticated at
    31Monitor

Published before and after this one in the same product

  • Later →CVE-2023-0655Feb 13, 2023 · SonicWall Email Security contains a vulnerability that could permit a remote unauthenticated attacker access to an error page that includes
    21Monitor
  • Later →CVE-2024-22398Mar 14, 2024 · An improper Limitation of a Pathname to a Restricted Directory (Path Traversal) vulnerability in SonicWall Email Security Appliance could al
    19Monitor
  • Later →CVE-2026-3468Mar 31, 2026 · A stored Cross-Site Scripting (XSS) vulnerability has been identified in the SonicWall Email Security appliance due to improper neutralizati
    19Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. CISA KEV+207 d
  3. TodayNov 1, 2026+2032 d

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • Administrator privileges are required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-434 · Unrestricted Upload of File with Dangerous Type

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records