# CVE-2023-0656 — SonicWall SonicOS

> As of 2025-03-07, CVE-2023-0656 is a vulnerability in SonicWall SonicOS, EPSS 41.3% (98.6th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2023-0656, most recently “Coordinated Reconnaissance Campaign Maps SonicWall SSL VPN Attack Surface via Commercial Proxy Infrastructure (84,142 Sessions / 4,305 IPs / 20 ASNs)”.

**Last updated:** 2025-03-07

## What is CVE-2023-0656?

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.

The record classifies CVE-2023-0656 under weakness class [CWE-121](https://intel.threadlinqs.com/cwe/CWE-121). 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 1325 days ago.

## Severity and exploitation probability

- **EPSS (FIRST):** 41.3% probability of exploitation in the next 30 days, higher than 98.6% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 5.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2023-03-02, last modified 2025-03-07

## Is CVE-2023-0656 being exploited?

Weaponised exploit code for CVE-2023-0656 is publicly available. 2 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 38 in the Threadlinqs vulnerability feed.

- [BishopFox/CVE-2022-22274_CVE-2023-0656](https://github.com/BishopFox/CVE-2022-22274_CVE-2023-0656) (github)
- [trickest/cve](https://github.com/trickest/cve/blob/main/2023/CVE-2023-0656.md) (trickest)

## Affected products and versions

- [SonicWall](https://intel.threadlinqs.com/vendors/sonicwall): SonicOS

## How to fix CVE-2023-0656

No vendor patch reference has been recorded for CVE-2023-0656 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2023-0656

1 tracked threat in the Threadlinqs corpus references CVE-2023-0656, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Coordinated Reconnaissance Campaign Maps SonicWall SSL VPN Attack Surface via Commercial Proxy Infrastructure (84,142 Sessions / 4,305 IPs / 20 ASNs)](https://intel.threadlinqs.com/threat/TL-2026-1468) — HIGH · 2026-02-25

## Sources

Enriched from CVE.org, FIRST EPSS, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-10-10.

**Other references**

- [psirt.global.sonicwall.com](https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2023-0004)

Canonical: https://intel.threadlinqs.com/cve/CVE-2023-0656
Full detection coverage and IOCs for threats exploiting CVE-2023-0656 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp