CVE-2021-20031

Sonicos vulnerability

CVSS

6.1

EPSS

13.0%

EPSS pct

96th

Exploited

No known

A Host Header Redirection vulnerability in SonicOS potentially allows a remote attacker to redirect firewall management users to arbitrary web domains.

Affected vendor

Sonicwall

Affected product

Sonicos

CVSS vector

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

Weakness type (CWE)

CWE-601 — Open Redirect

Published

2021-10-12

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, user interaction. Successful exploitation leads to low impact to confidentiality, low impact to integrity.

Its EPSS score of 13.0% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2021-20031

Confirm whether Sonicwall Sonicos is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2021-20031.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-20031

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-20031 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

Run a free external exposure scan

Are you exposed to CVE-2021-20031?

Run an instant, non-intrusive external scan to check your attack surface for CVE-2021-20031.

Start free scan

No credit card. Agentless.

Related vulnerabilities

MEDIUM

CVE-2006-4161

Xennobb vulnerability

Heartbeat vulnerability