Dashboard / CVE-2021-20027

CVE-2021-20027

HIGH
MEDIUM Priority: 0.10 BB Relevance: 75/100
Published: 2021-06-14 Modified: 2026-11-09 First seen: 2026-11-09 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: Unchanged
C: None
I: None
A: High

Description

A buffer overflow vulnerability in SonicOS allows a remote attacker to cause a Denial of Service (DoS) by sending a specially crafted request. This vulnerability affects SonicOS Gen5, Gen6, Gen7 platforms, and SonicOSv virtual firewalls.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
sonicwall sonicos < 7.0.1-r1262

References & Advisories (1)

Bug Bounty Relevance

75 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

7.5 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploitation Probability

1.29%
Raw Score 0.012910
Percentile 70.7%
Date 2026-11-13

EPSS Trend

2026-11-13
0.01291
2026-11-12
0.01291
2026-11-10
0.01291
2026-11-09
0.01291

Intelligence Sources

nvd ref →

External Links