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CVE-2021-20031

46
FAUCET Score

CVE-2021-20031 is a Host Header Redirection vulnerability in SonicOS that could allow a remote attacker to redirect firewall management users to arbitrary web domains. This medium-severity vulnerability (CVSS 6.1) has a low attack complexity and requires user interaction, potentially leading to limited confidentiality and integrity impacts. While not in the KEV catalog, public exploit code exists via ExploitDB and Nuclei templates, indicating a potential for exploitation. Despite this, there is minimal community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 7.0.1-r1262CPE matchmatch criteria
cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:*
<= 7.0.1-r1283CPE matchmatch criteria
cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:*
<= 7.0.1-r579CPE matchmatch criteria
cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:*
<= 6.5.4.7CPE matchmatch criteria
cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:*
<= 6.5.1.12CPE matchmatch criteria
cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
13.04%
Probability of exploitation in next 30 days
EPSS Percentile
95.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
Nuclei: CVE-2021-20031 · Oct 18, 2021
ExploitDB: EDB-50414 · Oct 13, 2021
This CVE's current EPSS score of 0.1304 is in the 98th percentile among its peer group of 26,236 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

packetstormsecurity.com / files/164502/Sonicwall-SonicOS-7.0-Host-Header-Injection.html
ExploitThird Party AdvisoryVDB Entry
psirt.global.sonicwall.com / vuln-detail/SNWLID-2021-0019
Vendor Advisory