Dashboard / CVE-2021-20048

CVE-2021-20048

HIGH
MEDIUM Priority: 0.18 BB Relevance: 68/100
Published: 2022-01-10 Modified: 2026-11-09 First seen: 2026-11-09 Status: active

Attack Surface

Network Low Complexity No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

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

Description

A Stack-based buffer overflow in the SonicOS SessionID HTTP response header allows a remote authenticated attacker to cause Denial of Service (DoS) and potentially results in code execution in the firewall. This vulnerability affected SonicOS Gen 5, Gen 6 and Gen 7 firmware versions.

Weakness Classification (2)

Affected Software (1)

VendorProductVersion
sonicwall sonicos < 7.0.1-r1456

References & Advisories (1)

Bug Bounty Relevance

68 / 100
✓ Network accessible
✓ Low complexity
✓ No user interaction

CVSS Score

8.8 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploitation Probability

2.00%
Raw Score 0.020030
Percentile 81.1%
Date 2026-11-13

EPSS Trend

2026-11-13
0.02003
2026-11-12
0.02003
2026-11-10
0.02003
2026-11-09
0.02003

Intelligence Sources

nvd ref →

External Links