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CVE-2020-5135 (GCVE-0-2020-5135)

Vulnerability from cvelistv5 – Published: 2020-10-12 10:40 – Updated: 2025-10-21 23:35
VLAI CISA Previdian
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-06 19:55 UTC
CWE
  • CWE-120 - Buffer Copy without Checking Size of Input
Assigner
References
Impacted products
Vendor Product Version CPE status
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
guessed Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 6a65d1b1-1761-44f4-993a-104a6d60c12e

Vulnerability ID: CVE-2020-5135

Status: Confirmed

Status Updated: 2022-03-15 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2022-03-15
Asserted: 2022-03-15
Scope
Notes: KEV entry: SonicWall SonicOS Buffer Overflow Vulnerability | Affected: SonicWall / SonicOS | 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. | Required action: Apply updates per vendor instructions. | Due date: 2022-04-05 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2020-5135
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-120
Feed CISA Known Exploited Vulnerabilities Catalog
Product SonicOS
Due Date 2022-04-05
Date Added 2022-03-15
Vendorproject SonicWall
Vulnerabilityname SonicWall SonicOS Buffer Overflow Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 13:25 UTC | Updated: 2026-02-06 07:53 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 8a344ca3-1989-4bc2-a4f1-e83e46be319b

Vulnerability ID: CVE-2020-5135

Status: Confirmed

Status Updated: 2022-03-15 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2022-03-15
Asserted: 2022-03-15
Scope
Notes: KEVIntel entry: A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by... | Affected: SonicWall / SonicOS | CVSS: 9.8 (CRITICAL) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by...
Vendor SonicWall
Product SonicOS
Added Date 2022-03-15T00:00:00.000Z
Cvss Score 9.8
Epss Score None
Cvss Severity CRITICAL
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 11:13 UTC | Updated: 2026-06-23 11:13 UTC
Show details on NVD website
To clipboard 

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                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2020-10-12T10:40:28.000Z",
            "orgId": "44b2ff79-1416-4492-88bb-ed0da00c7315",
            "shortName": "sonicwall"
          },
          "references": [
            {
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2020-0010"
            }
          ],
          "x_legacyV4Record": {
            "CVE_data_meta": {
              "ASSIGNER": "PSIRT@sonicwall.com",
              "ID": "CVE-2020-5135",
              "STATE": "PUBLIC"
            },
            "affects": {
              "vendor": {
                "vendor_data": [
                  {
                    "product": {
                      "product_data": [
                        {
                          "product_name": "SonicOS",
                          "version": {
                            "version_data": [
                              {
                                "version_value": "SonicOS 6.5.4.7-79n and earlier"
                              },
                              {
                                "version_value": "SonicOS 6.5.1.11-4n and earlier"
                              },
                              {
                                "version_value": "SonicOS 6.0.5.3-93o and earlier"
                              },
                              {
                                "version_value": "SonicOSv 6.5.4.4-44v-21-794 and earlier"
                              },
                              {
                                "version_value": "SonicOS 7.0.0.0-1"
                              }
                            ]
                          }
                        }
                      ]
                    },
                    "vendor_name": "SonicWall"
                  }
                ]
              }
            },
            "data_format": "MITRE",
            "data_type": "CVE",
            "data_version": "4.0",
            "description": {
              "description_data": [
                {
                  "lang": "eng",
                  "value": "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."
                }
              ]
            },
            "problemtype": {
              "problemtype_data": [
                {
                  "description": [
                    {
                      "lang": "eng",
                      "value": "CWE-120: Buffer Copy without Checking Size of Input"
                    }
                  ]
                }
              ]
            },
            "references": {
              "reference_data": [
                {
                  "name": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2020-0010",
                  "refsource": "CONFIRM",
                  "url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2020-0010"
                }
              ]
            }
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "44b2ff79-1416-4492-88bb-ed0da00c7315",
        "assignerShortName": "sonicwall",
        "cveId": "CVE-2020-5135",
        "datePublished": "2020-10-12T10:40:28.000Z",
        "dateReserved": "2019-12-31T00:00:00.000Z",
        "dateUpdated": "2025-10-21T23:35:35.728Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.