VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVReported exploited: VulnCheck KEV since Published EPSS 41.3% probability of exploitation in 30 days
SonicWall

CVE-2023-0656: A Stack-based buffer overflow vulnerability in the SonicOS allows a remote unauthenticated attacker to cause Denial o…

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of .

VulnCheck KEV lists it since . It cites 626 public reports, the first from .

How likely is exploitation in the next 30 days?
41.3%

EPSS score, percentile 98.7 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?
Not scored

The CVE record carries no CVSS score.

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected

  • SonicOS NSv 6.5.4.4-44v-21-1551 and earlier
  • SonicOS NSsp 7.0.1-5083 and earlier
  • SonicOS 7.0.1-5095 and earlier

Versions by product

Source: CISA KEV 2026.10.29, as of ; VulnCheck KEV, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.

Description

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.

Source: CVE List, as of . About the data.

What to do

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Versions by product, as listed in the CVE record (1 product)
SonicWall SonicOS
StatusVersions
AffectedSonicOS NSv 6.5.4.4-44v-21-1551 and earlier
AffectedSonicOS NSsp 7.0.1-5083 and earlier
AffectedSonicOS 7.0.1-5095 and earlier

Source: CVE List, as of . About the data.

Weakness

CWE-121
  • CWE-121: Stack-based Buffer Overflow

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

DateEvent
CVE record published
CVE record last updated

References

1

Known exploited SonicWall vulnerabilities

  • CVE-2026-83548: SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability (added )
  • CVE-2026-83549: SonicWall SMA1000 Appliances OS Command Injection Vulnerability (added )
  • CVE-2026-15409: SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability (added )
  • CVE-2026-15410: SonicWall SMA1000 Appliances Code Injection Vulnerability (added )
  • CVE-2025-40602: SonicWall SMA1000 Missing Authorization Vulnerability (added )