THREATPORT/VULNERABILITY/CVE-2023-0656
HIGH SEVERITY

CVE-2023-0656

Sonicos vulnerability

CVSS
7.5
EPSS
41.3%
EPSS pct
99th
Exploited
No known
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.
Affected vendor
Sonicwall
Affected product
Sonicos
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness type (CWE)
  • CWE-121 — Stack-based Buffer Overflow
  • CWE-787 — Out-of-bounds Write
Published
2023-03-02

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 41.3% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it among the most exploited CVEs currently tracked.

Check your external exposure to CVE-2023-0656

  • Confirm whether Sonicwall Sonicos is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2023-0656.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2023-0656

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2023-0656 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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