CVE-2020-5136 — A buffer overflow vulnerability in SonicOS allows an authenticated attacker to cause Denial of Service (DoS) in the SSL-VPN and virtual assist portal, which leads to a firewall crash

Back Back to CVE browser

MEDIUM

A buffer overflow vulnerability in SonicOS allows an authenticated attacker to cause Denial of Service (DoS) in the SSL-VPN and virtual assist portal, which leads to a firewall crash

Published Oct 12, 2020

6.5

MEDIUM

CVSS 3.1

EPSS 1.12%

Description

A buffer overflow vulnerability in SonicOS allows an authenticated attacker to cause Denial of Service (DoS) in the SSL-VPN and virtual assist portal, which leads to a firewall crash. This vulnerability affected SonicOS Gen 5 version 5.9.1.7, 5.9.1.13, Gen 6 version 6.5.4.7, 6.5.1.12, 6.0.5.3, SonicOSv 6.5.4.v and Gen 7 version 7.0.0.0.

Affected products

Vendor SonicWall Product SonicOS Default
n/a
- Version
  SonicOS 5.9.1.13-5n and earlier
  Status
  affected
  Constraints
  -
- Version
  SonicOS 5.9.1.7-2n and earlier
  Status
  affected
  Constraints
  -
- Version
  SonicOS 6.0.5.3-93o and earlier
  Status
  affected
  Constraints
  -
- Version
  SonicOS 6.5.1.11-4n and earlier
  Status
  affected
  Constraints
  -
- Version
  SonicOS 6.5.4.7-79n and earlier
  Status
  affected
  Constraints
  -
- Version
  SonicOS 7.0.0.0-1
  Status
  affected
  Constraints
  -
- Version
  SonicOSv 6.5.4.4-44v-21-794 and earlier
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

SonicWall

SonicOS

n/a

Version	Status	Constraints
SonicOS 5.9.1.13-5n and earlier	affected	-
SonicOS 5.9.1.7-2n and earlier	affected	-
SonicOS 6.0.5.3-93o and earlier	affected	-
SonicOS 6.5.1.11-4n and earlier	affected	-
SonicOS 6.5.4.7-79n and earlier	affected	-
SonicOS 7.0.0.0-1	affected	-
SonicOSv 6.5.4.4-44v-21-794 and earlier	affected	-

Remediation

No remediation recorded yet.

Metrics

1.12% 0.01118

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.

EPSS probability 0.01118

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Table of values (12 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 2, 2026	1.12% (0.01118)	64.93th	v5 (v2026.06.15)
Sep 20, 2026	1.12% (0.01118)	64.66th	v5 (v2026.06.15)
Jul 20, 2024	0.07% (0.00075)	32.77th	v3 (v2023.03.01)
Jun 14, 2024	0.07% (0.00075)	32.37th	v3 (v2023.03.01)
Mar 7, 2023	0.07% (0.00075)	30.36th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Apr 1, 2022	0.89% (0.00885)	24.24th	v2 (v2022.01.01)
Feb 4, 2022	4.50% (0.04499)	74.08th	v2 (v2022.01.01)
Feb 3, 2022	2.28% (0.02283)	52.26th	v1
Jan 6, 2022	2.28% (0.02283)	51.78th	v1
Jan 5, 2022	0.52% (0.00518)	31.20th	v5 (v2026.06.15)
Apr 14, 2021	0.52% (0.00518)	0.00th	v1