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CVE-2023-0656 (GCVE-0-2023-0656)

Vulnerability from cvelistv5 – Published: 2023-03-02 00:00 – Updated: 2025-03-07 17:28
VLAI Shadowserver Previdian
Summary
A Stack-based buffer overflow vulnerability in the SonicOS allows a remote unauthenticated attacker to cause Denial of Service (DoS), which could cause an impacted firewall to crash.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-07 17:27 UTC
CWE
  • CWE-121 - Stack-based Buffer Overflow
Assigner
References
Impacted products
Vendor Product Version CPE status
SonicWall SonicOS Affected: SonicOS NSv 6.5.4.4-44v-21-1551 and earlier
Affected: SonicOS NSsp 7.0.1-5083 and earlier
Affected: SonicOS 7.0.1-5095 and earlier
guessed Create a notification for this product.
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 95f6cd85-cb6f-45fc-99fb-837547a64cd6

Vulnerability ID: CVE-2023-0656

Status: Confirmed

Status Updated: 2026-07-14 00:00 UTC

Exploited: Yes

Characteristics
Severity: 75.0
Timestamps
First Seen: 2024-09-12
Asserted: 2024-09-12
Last Seen: 2026-07-14
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: SonicWall / SonicOS | Class: firewall | Severity: High (CVSS 7.5) | IoT: no | In CISA KEV: no | Honeypot connections on 2026-07-14: 12
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 12
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class firewall
7D Avg 4
Vendor SonicWall
30D Avg 5
90D Avg 50
Product SonicOS
Cisa Kev no
Connections 12
Observation Date 2026-07-14
Vulnerability Class CVSS
Vulnerability Score 7.5
Vulnerability Severity High
References
Created: 2026-06-30 09:39 UTC | Updated: 2026-07-16 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: f061c2a5-25c5-42ca-bc8f-fd2d2dd2ff89

Vulnerability ID: CVE-2023-0656

Status: Confirmed

Status Updated: 2025-04-28 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2025-04-28
Asserted: 2025-04-28
Scope
Notes: KEVIntel entry: A Stack-based buffer overflow vulnerability in the SonicOS allows a remote unauthenticated attacker to cause Denial of Service (DoS), which could... | Affected: SonicWall / SonicOS | CVSS: 7.5 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title A Stack-based buffer overflow vulnerability in the SonicOS allows a remote unauthenticated attacker to cause Denial of Service (DoS), which could...
Vendor SonicWall
Product SonicOS
Added Date 2025-04-28T00:00:00.000Z
Cvss Score 7.5
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-06-23 14:04 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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    "redhat_vex": {
      "current_release_date": "2025-05-28T23:47:38+00:00",
      "cve": "CVE-2023-0656",
      "id": "CVE-2023-0656",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "CVE-2023-0656",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-0656.json",
      "version": "3"
    },
    "vulnrichment": {
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      "cveMetadata": "{\"cveId\": \"CVE-2023-0656\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-03-07T17:28:09.794Z\", \"dateReserved\": \"2023-02-02T00:00:00.000Z\", \"assignerOrgId\": \"44b2ff79-1416-4492-88bb-ed0da00c7315\", \"datePublished\": \"2023-03-02T00:00:00.000Z\", \"assignerShortName\": \"sonicwall\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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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.