Buffer overflow in SonicWall SonicOS
Priority CRITICAL 100Exploited in the wildCWE-120Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-120 and the CVSS impact.
Summary
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.
Why it matters now
Exploitation Active In CISA KEV since 2022-03-15CISA due date 2022-04-05Known ransomware use
EPSS 0.26869 98th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Active
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| SonicWall | SonicOS | SonicOS 6.5.4.7-79n and earlier; SonicOS 6.5.1.11-4n and earlier; SonicOS 6.0.5.3-93o and earlier; SonicOSv 6.5.4.4-44v-21-794 and earlier; SonicOS 7.0.0.0-1 | — | No fix listed | CNA |
- SonicOS VendorSonicWall Affected SonicOS 6.5.4.7-79n and earlier; SonicOS 6.5.1.11-4n and earlier; SonicOS 6.0.5.3-93o and earlier; SonicOSv 6.5.4.4-44v-21-794 and earlier; SonicOS 7.0.0.0-1 Fixed in — No fix listed CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:* | up to 6.0.5.3; 6.5.0.0 – 6.5.1.11; 6.5.4.0 – 6.5.4.7 | Vulnerable | SonicWall |
| cpe:2.3:o:sonicwall:sonicos:7.0.0.0:*:*:*:*:*:*:* | 7.0.0.0 | Vulnerable | SonicWall |
| cpe:2.3:o:sonicwall:sonicosv:*:*:*:*:*:*:*:* | up to 6.5.4.4 | Vulnerable | SonicWall |
- cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:* Versions up to 6.0.5.3; 6.5.0.0 – 6.5.1.11; 6.5.4.0 – 6.5.4.7 Vulnerable ·SonicWall
- cpe:2.3:o:sonicwall:sonicos:7.0.0.0:*:*:*:*:*:*:* Versions 7.0.0.0 Vulnerable ·SonicWall
- cpe:2.3:o:sonicwall:sonicosv:*:*:*:*:*:*:*:* Versions up to 6.5.4.4 Vulnerable ·SonicWall
Remediation
No fixed version listed by the sources yet.
Timeline
- 2022-03-15 Added to CISA KEV
- 2026-10-02 Threatist record created from CVE-2020-5135
- 2026-10-03 Alias added: GHSA-vw5m-894x-7rp4
References
More SonicWall Sonicos vulnerabilities
- TI-2024-35902 Improper authentication in SonicWall SonicOS KEVCVSS 3.1CRITICAL 9.8
- TI-2024-27152 Improper access control in SonicWall SonicOS KEVCVSS 3.1CRITICAL 9.8
- TI-2022-06604 Stack-based buffer overflow in SonicWall SonicOS CVSS 3.1CRITICAL 9.8
- TI-2019-09143 Wind River VxWorks has a Buffer Overflow in the TCP component (issue 1 of 4). CVSS 3.1CRITICAL 9.8
- TI-2019-09145 Wind River VxWorks 6.6 through 6.9 has a Buffer Overflow in the DHCP client component. CVSS 3.1HIGH 8.8
- TI-2021-02413 NULL pointer deref in signature_algorithms processing CVSS 3.1MEDIUM 5.9
Sources
- CVE-2020-5135 · CVE Program
- CVE-2020-5135 · NVD
- CISA Known Exploited Vulnerabilities
- FIRST EPSS
- GHSA-vw5m-894x-7rp4 · GitHub Advisory Database · CC BY 4.0
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