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CVE-2026-3439

SonicOS Certificate Handling Buffer Overflow Enables Firewall Crash

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

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed
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Nsa 2700 Nsa 2800 Nsa 3700 and 30 more
CVE-2023-39276

SonicOS post-authentication stack-based buffer overflow vulnerability in the getBookmarkList.json URL endpoint leads to a firewall crash.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
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Nsa2700 Nsa3700 Nsa4700 and 58 more
CVE-2023-39280

SonicOS p ost-authentication Stack-Based Buffer Overflow vulnerability in the ssoStats-s.xml, ssoStats-s.wri URL endpoints leads to a firewall crash.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
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Nsa2700 Nsa3700 Nsa4700 and 58 more
CVE-2026-0402

Post-Authentication Out-of-Bounds Read Leading to Firewall Crash

A post-authentication Out-of-bounds Read vulnerability in SonicOS allows a remote attacker to crash a firewall.

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed
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Nsa 2700 Nsa 2800 Nsa 3700 and 30 more
CVE-2024-40764

Heap-based buffer overflow vulnerability in the SonicOS IPSec VPN allows an unauthenticated remote attacker to cause Denial of Service (DoS).

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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Nsa 2700 Nsa 3700 Nsa 4700 and 29 more
CVE-2026-0399

Authenticated Stack‑Based Buffer Overflow in SonicOS Management API

Multiple post-authentication stack-based buffer overflow vulnerabilities in the SonicOS management interface due to improper bounds checking in a API endpoint.

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed
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Nsa 2700 Nsa 2800 Nsa 3700 and 30 more
CVE-2023-41712

SonicOS post-authentication Stack-Based Buffer Overflow Vulnerability in the SSL VPN plainprefs.exp URL endpoint leads to a firewall crash.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
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Nsa2700 Nsa3700 Nsa4700 and 58 more
CVE-2023-41711

SonicOS post-authentication Stack-Based Buffer Overflow Vulnerability in the sonicwall.exp, prefs.exp URL endpoints lead to a firewall crash.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
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Nsa2700 Nsa3700 Nsa4700 and 58 more
CVE-2021-20046

A Stack-based buffer overflow in the SonicOS HTTP Content-Length response header allows a remote authenticated attacker to cause Denial of Service (DoS) and potentially results in code execution in the firewall. This vulnerability affected SonicOS Gen 5, Gen 6 and Gen 7 firmware versions.

CVSS 3.1 · 8.8 High EPSS 2.0% KEV · Not listed
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Nsa 2650 Nsa 2700 Nsa 3650 and 56 more
CVE-2021-20027

A buffer overflow vulnerability in SonicOS allows a remote attacker to cause a Denial of Service (DoS) by sending a specially crafted request. This vulnerability affects SonicOS Gen5, Gen6, Gen7 platforms, and SonicOSv virtual firewalls.

CVSS 3.1 · 7.5 High EPSS 1.3% KEV · Not listed
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Nsa 2650 Nsa 2700 Nsa 3650 and 56 more
CVE-2021-20048

A Stack-based buffer overflow in the SonicOS SessionID HTTP response header allows a remote authenticated attacker to cause Denial of Service (DoS) and potentially results in code execution in the firewall. This vulnerability affected SonicOS Gen 5, Gen 6 and Gen 7 firmware versions.

CVSS 3.1 · 8.8 High EPSS 2.0% KEV · Not listed
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Nsa 2650 Nsa 2700 Nsa 3650 and 56 more
CVE-2023-0656

A Stack-based buffer overflow vulnerability in the SonicOS allows a remote unauthenticated attacker to cause Denial of Service (DoS), which could cause an impacted firewall to crash.

CVSS 3.1 · 7.5 High EPSS 41.3% KEV · Not listed
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Nsa 2700 Nsa 3700 Nsa 4700 and 29 more
CVE-2026-0206

Post‑Authentication Buffer Overflow in SonicOS Causes Firewall Crash

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

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed
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Nsa 2650 Nsa 2700 Nsa 2800 and 61 more
CVE-2022-22274

A Stack-based buffer overflow vulnerability in the SonicOS via HTTP request allows a remote unauthenticated attacker to cause Denial of Service (DoS) or potentially results in code execution in the firewall.

CVSS 3.1 · 9.8 Critical EPSS 75.5% KEV · Not listed
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Nsa 2700 Nsa 3700 Nsa 4700 and 30 more
CVE-2024-29012

Stack-based buffer overflow vulnerability in the SonicOS HTTP server allows an authenticated remote attacker to cause Denial of Service (DoS) via sscanf function.

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed
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Nsa 2700 Nsa 3700 Nsa 4700 and 19 more
CVE-2024-29013

Heap-based buffer overflow vulnerability in the SonicOS SSL-VPN allows an authenticated remote attacker to cause Denial of Service (DoS) via memcpy function.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
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Nsa 2700 Nsa 3700 Nsa 4700 and 19 more
CVE-2026-58933

Out-of-Bounds Read in Android C2SoftApvDec Leads to Remote Information Disclosure

In process of C2SoftApvDec.cpp, there is a possible out-of-bounds read due to a logic error in the code. This could lead to remote information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
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CVE-2026-124060

TOTOLINK CA300-PoE cstecgi.cgi UploadCustomModule buffer overflow

A vulnerability was detected in TOTOLINK CA300-PoE 6.2c.884. Affected by this issue is the function UploadCustomModule of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument File results in buffer overflow. The attack may be launched remotely. The exploit is now public and may be used.

CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed
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CVE-2026-123961

TOTOLINK CA300-PoE cstecgi.cgi setWiFiBasicConfig buffer overflow

A security vulnerability has been detected in TOTOLINK CA300-PoE 6.2c.884. This impacts the function setWiFiBasicConfig of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument KeyStr leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used.

CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed
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CVE-2026-123957

TOTOLINK CA300-PoE cstecgi.cgi setIpQosRules buffer overflow

A vulnerability was determined in TOTOLINK CA300-PoE 6.2c.884. Impacted is the function setIpQosRules of the file /cgi-bin/cstecgi.cgi. This manipulation of the argument ipStart causes buffer overflow. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized.

CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed
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