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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…

Medium6.5EPSS 1.1%
Published
Updated
Reserved
Assigned by
sonicwall

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.

Scores

CVSS scores of CVE-2020-5136, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.1Medium6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
1.1% · top 34% of all CVEs (6 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.

Weakness

Affected products

  • SonicWall · SonicOS

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

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .