CVE-2023-0656SonicOS Stack Buffer Overflow
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.
Published Mar 2, 2023 · Updated Mar 7, 2025
Key Facts
Patch immediately- CVE-2023-0656 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting SonicOS (Sonicwall).
- It is exploited in the wild, listed in CIRCL KEV, Industry KEV feed since Sep 12, 2024. No public exploit code is known.
- EPSS estimates a 41% probability of exploitation in the next 30 days.
- Fixed versions are available, including SonicOS <=7.0.1-5111, SonicOS 7.0.1-5111.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
41%
Higher than 98.6% of all scored CVEs
Exploit maturity
None known
ATLAS score
34/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Sep 12, 2024
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
None known
Public exploit code
0
Proof-of-concept links
In-the-wild evidence
10
Reports of active use
Advisories And Exploit References
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CIRCL KEV | Sep 12, 2024 | n/a | Not reported |
| Industry KEV feed | Sep 12, 2024 | n/a | Not reported |
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| SonicOSSonicwall | >= SonicOS NSv 6.5.4.4-44v-21-1551 and earlier | 7.0.1-5111 |
Patched Releases
SonicOS
<=7.0.1-5111
Timeline
Publicly disclosed
Mar 2, 2023
Added to CIRCL KEV
Sep 12, 2024
Added to Industry KEV feed
Sep 12, 2024
Last updated
Mar 7, 2025
Weakness Type
- CWE-121 Stack-based Buffer Overflow
- CWE-787 Out-of-bounds Write
References
- advisorypsirt.global.sonicwall.com · SNWLID-2023-0004
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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: SonicOS (Sonicwall) versions >= SonicOS NSv 6.5.4.4-44v-21-1551 and earlier. The full list is in the CVE brief.
It is exploited in the wild, listed in CIRCL KEV, Industry KEV feed since Sep 12, 2024.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including SonicOS <=7.0.1-5111, SonicOS 7.0.1-5111.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2023-0656 On Your Attack Surface?
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