SonicWall SonicOS Buffer Overflow Vulnerability
A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by sending a malicious request to the firewall. This vulnerability affected SonicOS Gen 6 version…
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 5 / 5
- KEV catalog (CISA)15 Mar 2022
- Exploited in EUVD (ENISA)15 Mar 2022
- Used by ransomwareyes
- EPSS above 10 %26.9%
- No account, over the networkyes
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply updates per vendor instructions.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Description ENISA EUVD
A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by sending a malicious request to the firewall. This vulnerability affected SonicOS Gen 6 version 6.5.4.7, 6.5.1.12, 6.0.5.3, SonicOSv 6.5.4.v and Gen 7 version 7.0.0.0.
Affected products
- SonicOS 6.5.1.11-4n and earlier
- SonicOSv 6.5.4.4-44v-21-794 and earlier
- SonicOS 6.5.4.7-79n and earlier
- SonicOS 6.0.5.3-93o and earlier
- SonicOS 7.0.0.0-1
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
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Published
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Exploitation reported (ENISA)
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Added to the KEV catalog
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CISA remediation due date
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EPSS peak: 26.9%
References
Other exploited vulnerabilities from the same vendor
- CVE-2026-83549SonicWall SMA1000 Appliances OS Command Injection Vulnerability4.6 · Actively exploited
- CVE-2026-83548SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability6.0 · Actively exploited
- CVE-2026-15410SonicWall SMA1000 Appliances Code Injection Vulnerability5.6 · Actively exploited
- CVE-2026-15409SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability6.6 · Actively exploited
- CVE-2025-40602SonicWall SMA1000 Missing Authorization Vulnerability3.9 · Background exploitation
- CVE-2023-44221SonicWall SMA100 Appliances OS Command Injection Vulnerability7.0 · Background exploitation