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CVE-2026-77709

Quick assessment

Affected

SonicWall SonicOS

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 SonicOS 的 TACACS+ 认证客户端中发现了一个认证前的基于堆的缓冲区溢出漏洞。在特定条件下，该漏洞可能使远程未认证攻击者引发应用层面的拒绝服务（DoS）。

AI Predicted 5.5 Difficulty: Moderate Updated Nov 07, 2026

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood

Affected Version Matrix 2

Vendor	Product	Version Range	Status
SonicWall	SonicOS	`7.3.3-7015 and older versions`	affected
		`8.2.2-8015 and older versions`	affected

Updated Nov 07, 2026

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Vulnerability Information

Have questions about the vulnerability? See if Shenlong's analysis helps!

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Vulnerability Title

N/A

Source: CVE Program / CVE List V5

Vulnerability Description

A pre-authentication heap-based buffer overflow vulnerability has been identified in the SonicOS TACACS+ authentication client, which in specific conditions could potentially enable a remote unauthenticated attacker to cause an application level denial of service.

Source: CVE Program / CVE List V5

CVSS Information

N/A

Source: CVE Program / CVE List V5

Vulnerability Type

堆缓冲区溢出

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
SonicWall	SonicOS	7.3.3-7015 and older versions	-

II. Public POCs for CVE-2026-77709

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-77709

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Other References for CVE-2026-77709 (1)

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2026-0014 vendor-advisory

https://www.cve.org/CVERecord?id=CVE-2026-77709

Same Patch Batch · SonicWall · 2026-11-06 · 7 CVEs total

CVE-2026-107155		SonicOS 管理接口宽松跨域策略漏洞
CVE-2026-107154		SonicOS 会话验证漏洞允许远程未授权攻击
CVE-2026-82308		SonicOS SSL-VPN 预认证堆缓冲区溢出漏洞
CVE-2026-19868		SonicOS SSLVPN 认证绕过漏洞
CVE-2026-19703		SonicOS 虚拟设备弱密码哈希漏洞
CVE-2026-77708		SonicOS TACACS+ 客户端认证前栈溢出导致拒绝服务

IV. Related Vulnerabilities

Same product: SonicOS

Same vendor: SonicWall

Same weakness: CWE-122