CVE-2021-20021

Signals

NVD · CVE-2026-18907 · Path Traversal in Download File Feature in com.talpa.hibrowser 2.23.1.1 on Android allows arbitrary file write via directory traversal sequences in the filenameNVD · CVE-2026-18897 · 8.8 · A vulnerability was identified in UTT HiPER 1250GW up to v3.2.7-210907-180535. The impacted element is the function strcpy of the file /goform/getOneApConfTempENVD · CVE-2026-18896 · 6.3 · A vulnerability was determined in lavkush-maurya Student-Registration-System 1.0. The affected element is an unknown function of the file /student/changepass.phNVD · CVE-2026-18895 · 8.8 · A vulnerability was found in UTT HiPER 1250GW up to 3.2.7-210907-180535. Impacted is the function strcpy of the file /goform/APSecurity_5g. Performing a manipulCISA KEV · CVE-2026-18556 · 7.4 · N-able N-central Authentication Bypass Using an Alternate Path or Channel Vulnerability · Added 2026-08-04 · Due 2026-08-07CISA KEV · CVE-2026-34486 · 7.5 · Apache Tomcat Missing Encryption of Sensitive Data Vulnerability · Added 2026-08-04 · Due 2026-08-07NVD · CVE-2026-18907 · Path Traversal in Download File Feature in com.talpa.hibrowser 2.23.1.1 on Android allows arbitrary file write via directory traversal sequences in the filenameNVD · CVE-2026-18897 · 8.8 · A vulnerability was identified in UTT HiPER 1250GW up to v3.2.7-210907-180535. The impacted element is the function strcpy of the file /goform/getOneApConfTempENVD · CVE-2026-18896 · 6.3 · A vulnerability was determined in lavkush-maurya Student-Registration-System 1.0. The affected element is an unknown function of the file /student/changepass.phNVD · CVE-2026-18895 · 8.8 · A vulnerability was found in UTT HiPER 1250GW up to 3.2.7-210907-180535. Impacted is the function strcpy of the file /goform/APSecurity_5g. Performing a manipulCISA KEV · CVE-2026-18556 · 7.4 · N-able N-central Authentication Bypass Using an Alternate Path or Channel Vulnerability · Added 2026-08-04 · Due 2026-08-07CISA KEV · CVE-2026-34486 · 7.5 · Apache Tomcat Missing Encryption of Sensitive Data Vulnerability · Added 2026-08-04 · Due 2026-08-07

CVE Database · CVE-2021-20021

CVE-2021-20021

· CRITICALAnalyzed

CVSS v3.1

9.8

EPSS

83.43%

Published

Apr 9, 2021

Modified

Nov 10, 2025

CISA Known Exploited Vulnerability

Added: 2021-11-03 · Due: 2021-11-17

Apply updates per vendor instructions.

Public PoC / Exploit (3)

All weaponized →

NucleiNuclei detection template TrickestTrickest PoC index GitHub PoCSUPRAAA-1337/CVE-2021-20021★2

Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.

Description

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.

CVSS Vector

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

Weaknesses (CWE)

CWE-269CWE-269

Affected Products (20)

sonicwall · email_security (up to 10.0.9.6103)vulnerable

microsoft · windows

sonicwall · email_security_appliance_9000_firmware (up to 10.0.9.6105)vulnerable

sonicwall · email_security_appliance_9000

sonicwall · email_security_appliance_3300_firmware (up to 10.0.9.6105)vulnerable

sonicwall · email_security_appliance_3300

sonicwall · email_security_appliance_4300_firmware (up to 10.0.9.6105)vulnerable

sonicwall · email_security_appliance_4300

sonicwall · email_security_appliance_8300_firmware (up to 10.0.9.6105)vulnerable

References (3)

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0007

Vendor Advisory

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0007

Vendor Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20021

US Government Resource

KEV Catalog EPSS Scores Vendors All CVEs