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CVE-2020-5135

A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary…

Critical9.8Known exploitedEPSS 26.9%
Published
Updated
Reserved
Assigned by
sonicwall

Description

A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by sending a malicious request to the firewall. This vulnerability affected SonicOS 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.

Exploited in the wild

CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as SonicWall SonicOS Buffer Overflow Vulnerability.

Added
15 Mar 2022
Fix due (US federal)
5 Apr 2022
Used by ransomware
Known

Apply updates per vendor instructions.

Scores

CVSS scores of CVE-2020-5135, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1Critical9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Analyzed3.1Critical9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
26.9% · top 2.0% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: active · Automatable: yes · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.

Weakness

Affected products

  • SonicWall · SonicOS

    • affected SonicOS 6.5.4.7-79n 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 (2)

Sources

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

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Record last updated .