Is CVE-2021-20022 actively exploited?

Yes. CVE-2021-20022 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-20022 be exploited remotely?

The attack vector of CVE-2021-20022 has not been classified yet.

What is the CVSS score of CVE-2021-20022?

CVE-2021-20022 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-20022

HIGHCISA KEVIN THE WILD

CVE-2021-20022

Published: November 3, 2021

EPSS:20.02%probability of exploitation in 30 daysPercentile:95.3th

Official Description

SonicWall Email Security contains an unrestricted upload of file with dangerous type vulnerability that allows a post-authenticated attacker to upload a file to the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20021 and CVE-2021-20023 to achieve privilege escalation.

NVD Source

CISA KEV Advisory

SonicWall Email Security Unrestricted Upload of File Vulnerability

Added to KEV: 2021-11-03Federal patch deadline: 2021-11-17⚠ USED IN RANSOMWARE CAMPAIGNS

Required Action (CISA)

Apply updates per vendor instructions.

Risk Analysis

SonicWall Email Security has a flaw that permits a logged-in attacker to upload dangerous file types to the server. This vulnerability is rated as high severity and has a high EPSS score of 0.20022, indicating a significant chance of exploitation, which has been confirmed by CISA.

This vulnerability is actively exploited in the wild and is part of an exploit chain, as confirmed by its presence in CISA's KEV catalog. It requires post-authentication for exploitation.

Recommended Action

Apply all available security updates for SonicWall Email Security to patch this unrestricted file upload vulnerability. Implement strict file type validation and access controls for uploaded content.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-20022 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-20022 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.