CVE-2023-0656
Published: 02 March 2023
Summary
CVE-2023-0656 is a high-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Sonicwall Sonicos. Its CVSS base score is 7.5 (High).
Operationally, ranked in the top 3.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
A stack-based buffer overflow vulnerability, tracked as CVE-2023-0656 and assigned CWE-121 and CWE-787, exists in SonicOS. The flaw affects SonicWall firewalls and carries a CVSS 3.1 score of 7.5, reflecting network-accessible attack vectors that require no authentication or user interaction.
A remote unauthenticated attacker can send specially crafted network traffic to trigger the overflow, resulting in a denial-of-service condition that crashes the impacted firewall. The attack requires only low attack complexity and can be launched over the network without any privileges.
The official SonicWall PSIRT advisory SNWLID-2023-0004, published at https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2023-0004, provides remediation guidance for affected products. The EPSS score for this CVE rose from a low baseline to a peak of 0.4897, with the current value remaining at 0.3149, indicating that exploitation interest increased after public disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-12690
Vulnerability details
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.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.