Authenticated firewall crash via stack buffer overflow
Published Apr 29, 2026 · Updated Apr 29, 2026
Stack-based buffer overflow in SonicWall SonicOS allows remote authenticated users to crash an affected firewall over the network. SonicWall has not disclosed the affected request handler, input field, or operation that copies attacker-controlled data into the fixed-size stack buffer. Exploitation requires high privileges and network access to the affected interface; the resulting crash interrupts firewall availability without reported data disclosure or modification.
Summary
What happened
Stack-based buffer overflow in SonicWall SonicOS allows remote authenticated users to crash an affected firewall over the network. SonicWall has not disclosed the affected request handler, input field, or operation that copies attacker-controlled data into the fixed-size stack buffer. Exploitation requires high privileges and network access to the affected interface; the resulting crash interrupts firewall availability without reported data disclosure or modification.
The record
- CVE
- CVE-2026-0206
- Published
- Apr 29, 2026
- Updated
- Apr 29, 2026
- Vendor
- SonicWall
- Product
- SonicOS
- Classifications
- CWE-121, T1499.004
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Apr 29, 2026CVE publishedPublication date reported by the CVE source.
- Apr 29, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.5.5.1-6n and older versions
- Affected versionversion=7.0.1-5169 and older versions
- Affected versionversion=7.3.1-7013 and older versions
- Affected versionversion=8.1.0-8017 and older versions
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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