InfoSecBulletin Cybersecurity for mankind
SonicWall’s SMA100 series SSL-VPN appliances have serious security vulnerabilities, revealing ongoing issues in network infrastructure. The identified vulnerabilities show fundamental programming errors that allow pre-authentication attacks against firmware version 10.2.1.1.5.
CVE-2025-40596: Pre-Authentication Stack Buffer Overflow
Ransomware Crisis in 2026: 5,064 Organizations Affected in 135 Countries
Palo Alto Networks Addresses 13 Vulnerabilities
Critical Dell BIOS & Zimbra Flaws Expose Enterprise Systems
CoLoCity Launches New 1.0 MW Data Center Facility at Gulshan
Daily Cyber security update for 10. 07. 2026
How Hacker Compromise AWS Cloud Environment Using AI in 72 Hours
Mycelium Framework: First AI-as-a-Service Botnet
CrowdStrike Shows 5 New Prompt Injection Techniques for AI Agents
Critical GCP Dialogflow Vulnerability Allows Malicious Code Injection
CIRT identified 153 publicly exposed FortiGate devices in Bangladesh
WatchTower Labs found a classic stack-based buffer overflow vulnerability caused by malformed HTTP requests to the /api/ endpoint. The flaw within the /usr/src/EasyAccess/bin/httpd binary is responsible for processing incoming SSL-VPN connections.
The code uses an unsafe sscanf function that reads user-controlled URI data without checking limits. When the system encounters requests beginning with /api/, it copies user input into a 0x800-byte stack buffer located at [rsp+898h+var_878] without validating input length.
Exploitation requires minimal effort, achievable through a simple Python one-liner: import requests; requests.get(“https://x.x.x.x/api/v1/”+’A’*3000,verify=False).
Stack protection mechanisms reduce immediate exploitation risk, but the vulnerability’s pre-authentication aspect in SSL-VPNs poses serious security issues.
CVE-2025-40597: Heap Overflow:
The second vulnerability affects the mod_httprp.so module, likely standing for “HTTP Reverse Proxy,” which handles various SonicWall-specific HTTP parsing functions. A heap-based buffer overflow happens during Host header processing, showing that even “secure” coding can fail if done improperly.
The vulnerable code allocates a 128-byte heap chunk via calloc(0x80, 1) before passing it to __sprintf_chk. Despite using the supposedly safer sprintf variant, developers passed -1 (0xFFFFFFFFFFFFFFFF) as the size parameter, effectively disabling bounds checking entirely.
This configuration allows attackers to overflow the allocated heap chunk by sending oversized Host headers: import requests; requests.get(“https://x.x.x.x/api/”, headers={‘Host’:’A’*750}, verify=False).
The overflow corrupts adjacent heap metadata, potentially enabling more sophisticated exploitation techniques.
CVE-2025-40598: Cross-site Scripting Flaw:
The third vulnerability represents a straightforward reflected cross-site scripting flaw in the radiusChallengeLogin CGI endpoint. The state parameter reflects user input directly into HTTP responses without sanitization or encoding.
Exploitation requires minimal sophistication: https://x.x.x.x/cgi-bin/radiusChallengeLogin portalName=portal1&status=needchallenge&state=”><img/src=x+onerror=alert1>. Full report here.
