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CVE-2021-20021 CISA KEV · Actively exploitedLinked to ransomwareSuited to automated attack · CISA

Improper privilege management in SonicWall Email Security

CVSS score

9.8

EPSS probability

%88.8

Risk score

17.4

Published

5 y ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Mitigation available

Apply updates per vendor instructions.

Impact on My Inventory

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Vulnerability description

DayBreach CVE AI Research

CVE-2021-20021 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

A vulnerability in the SonicWall Email Security version 10.0.9.x allows an attacker to create an administrative account by sending a crafted HTTP request to the remote host.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2021-20021 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1sonicwallemail security View
2sonicwallemail security View
3microsoftwindows View
4sonicwallemail security appliance 9000 firmware View
5sonicwallemail security appliance 9000 View
6sonicwallemail security appliance 3300 firmware View
7sonicwallemail security appliance 3300 View
8sonicwallemail security appliance 4300 firmware View
9sonicwallemail security appliance 4300 View
10sonicwallemail security appliance 8300 firmware View
11sonicwallemail security appliance 8300 View
12sonicwallemail security appliance 5000 firmware View
13sonicwallemail security appliance 5000 View
14sonicwallemail security appliance 7000 firmware View
15sonicwallemail security appliance 7000 View
16sonicwallemail security appliance 5050 firmware View
17sonicwallemail security appliance 5050 View
18sonicwallemail security appliance 7050 firmware View
19sonicwallemail security appliance 7050 View
20sonicwallemail security virtual appliance View
21sonicwallhosted email security View
Total affected vendors: 2|Products: 21

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
9.8CVSS V3_1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCVE ADP
9.8CVSS V31CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HNVD
7.5CVSS V2—AV:N/AC:L/Au:N/C:P/I:P/A:PNVD

Patch and Remediation Guide

Solution & Remediation Advisory

Workaround

Resmî yama doğrulanamadı; geçici azaltım veya workaround mevcut.

canonical

Apply updates per vendor instructions.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

This CVE is marked as actively exploited in the CISA KEV catalogue, but no verified, downloadable public PoC or Metasploit module has been found yet. Evidence of active exploitation does not mean that public exploit code exists.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-20021 is associated with the following CWEs:

CWE-269: Common Weakness Enumeration Entry CWE-269

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-20021 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden
PermissionsGerekmiyor
UserGerekmiyor

Official Sources and Advisories

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0007vendor-advisoryhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20021nvdCISA Known Exploited Vulnerabilities Catalogkev

CVSS Vector Radar Chart

9.8 / 10
Attack VectorNetworkComplexityLowPrivilegesNoneUser Interact.NoneConfidentialityLowIntegrityNoneAvailabilityHigh

Vulnerability Scoring Details

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone required
User InteractionNone required
Confidentiality (Gizlilik)Low
Integrity (Bütünlük)None
Availability (Erişilebilirlik)High

Geçici çözüm

Resmî yama doğrulanamadı; geçici azaltım veya workaround mevcut.

Follow the vendor

S
sonicwall logo
sonicwall
M
microsoft logo
microsoft

Weakness Type (CWE & CAPEC)

CWE-269

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