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ExploitedNot in CISA KEV yet

CVE-2023-0656

Exploitation confirmed. First attested on 2024-09-12 by GCVE · kevintel, GCVE · shadowserver.

  • Published2023-03-02
  • WeaknessCWE-121 · CWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2023-03-0222:15CVE publishedNVD
  2. 2024-09-1220:24Listed as exploited by GCVEGCVE
  3. 2024-09-1220:24Exploitation first reportedGCVE

Observed activity

isMalicious corpus · updated 2026-11-03 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-0656?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-0656?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
SonicWall SonicOSversion to verify
BranchAffectedFixed in
7.0≤ 7.0.1-5111no fix published
7.0≤ 7.0.1-5083no fix published
6.5≤ 6.5.4.4-44v-21-1551no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As sonicwall, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • SonicWall SonicOS
    Affected
    • = SonicOS NSv 6.5.4.4-44v-21-1551 and earlierno fix stated
    • = SonicOS NSsp 7.0.1-5083 and earlierno fix stated
    • = SonicOS 7.0.1-5095 and earlierno fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2023-03-02

Fix

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedBishopFox/CVE-2022-22274_CVE-2023-0656
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2023-03-02
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-w97f-6vh7-h454

Frequently asked questions

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.

Is CVE-2023-0656 actively exploited?

Active exploitation of CVE-2023-0656 has not been confirmed. Its EPSS score was 41.3% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-0656?

CVE-2023-0656 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record