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A post-authentication Stack-based Buffer Overflow vulnerability in SonicOS certificate handling allows a remote attacker to crash a firewall.

CVE-2026-3439 is a stack-based buffer overflow vulnerability identified in SonicWall's SonicOS firewall operating system, specifically within the certificate handling component. This vulnerability is classified under CWE-121, indicating improper bounds checking that leads to buffer overflow on the stack. The flaw exists in multiple SonicOS versions: 7.0.1-5169 and older, 7.3.1-7013 and older, and 8.1.0-8017 and older. The vulnerability requires the attacker to have authenticated access to the device, which means the attacker must already possess valid credentials or have compromised an account. Once authenticated, the attacker can send specially crafted certificate data that triggers the buffer overflow, causing the firewall process to crash. This results in a denial of service (DoS) condition, disrupting network security enforcement and potentially allowing malicious traffic to pass unfiltered during downtime. Although no public exploits are currently known, the vulnerability's nature suggests that exploitation is straightforward for an authenticated attacker. The absence of a CVSS score means severity must be inferred from the technical details: the vulnerability affects availability primarily, with potential secondary impacts if combined with other vulnerabilities. The lack of user interaction requirement simplifies exploitation post-authentication. SonicWall firewalls are widely deployed in enterprise and government networks, making this vulnerability a significant concern for network security. The vulnerability was published on March 4, 2026, with no patches currently linked, emphasizing the need for vendor updates and mitigations.

Detailed information about CVE-2026-3439: CWE-121 Stack-based Buffer Overflow in SonicWall SonicOS affecting SonicWall SonicOS. Get real-time updates, technical

CVE-2026-3439: CWE-121 Stack-based Buffer Overflow in SonicWall SonicOS - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-3439: CWE-121 Stack-based Buffer Overflow in SonicWall SonicOS

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