Buffer overflow in SonicWall SonicOS
Priority LOW 35CWE-120Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. 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 a Denial of Service (DoS) by sending a specially crafted request. This vulnerability affects SonicOS Gen5, Gen6, Gen7 platforms, and SonicOSv virtual firewalls.
Why it matters now
EPSS 0.01291 70th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| SonicWall | SonicOS | SonicOS 5.9.1.13 and earlier; SonicOSv 6.5.4.4 and earlier; SonicOS 6.0.5.3 and earlier; SonicOS 6.5.1.12 and earlier; SonicOS 6.5.4.7 and earlier; SonicOS 7.0.1-R1219 and earlier; SonicOS 7.0.1-R514 and earlier; SonicOS 7.0.1-R1262 and earlier | — | No fix listed | CNA |
- SonicOS VendorSonicWall Affected SonicOS 5.9.1.13 and earlier; SonicOSv 6.5.4.4 and earlier; SonicOS 6.0.5.3 and earlier; SonicOS 6.5.1.12 and earlier; SonicOS 6.5.4.7 and earlier; SonicOS 7.0.1-R1219 and earlier; SonicOS 7.0.1-R514 and earlier; SonicOS 7.0.1-R1262 and earlier Fixed in — No fix listed CNA
CPE configurations NVD · 65
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:* | up to 7.0.1-r1262 | Vulnerable | SonicWall |
| cpe:2.3:h:sonicwall:nsa_2650:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsa_2700:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsa_3650:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsa_3700:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsa_4650:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsa_4700:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsa_5650:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsa_6650:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsa_6700:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
- cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:* Versions up to 7.0.1-r1262 Vulnerable ·SonicWall
- cpe:2.3:h:sonicwall:nsa_2650:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsa_2700:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsa_3650:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsa_3700:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsa_4650:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsa_4700:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsa_5650:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsa_6650:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsa_6700:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
Show 55 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:h:sonicwall:nsa_9250:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsa_9450:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsa_9650:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz270:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz270w:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz300:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz300p:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz300w:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz350:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz350w:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz370:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz370w:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz400:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz400w:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz470:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz470w:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz500:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz500w:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz570:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz570p:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz570w:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz600:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz600p:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:tz670:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:* | up to 7.0.1-r.1219 | Vulnerable | SonicWall |
| cpe:2.3:h:sonicwall:nsv_10:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsv_100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsv_1600:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsv_200:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsv_25:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsv_270:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsv_300:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsv_400:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsv_470:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsv_50:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsv_800:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nsv_870:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:* | up to 7.0.1-r514 | Vulnerable | SonicWall |
| cpe:2.3:h:sonicwall:nssp_12400:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nssp_12800:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nssp_13700:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:nssp_15700:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:* | up to 5.9.1.13 | Vulnerable | SonicWall |
| cpe:2.3:h:sonicwall:soho_250:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:soho_250w:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:* | up to 6.5.1.12 | Vulnerable | SonicWall |
| cpe:2.3:h:sonicwall:supermassive_9800:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:* | up to 6.5.4.7 | Vulnerable | SonicWall |
| cpe:2.3:h:sonicwall:supermassive_9200:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:supermassive_9400:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:supermassive_9600:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:* | all versions; up to 6.0.5.3-94o | Vulnerable | SonicWall |
| cpe:2.3:h:sonicwall:supermassive_e10200:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:supermassive_e10400:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
| cpe:2.3:h:sonicwall:supermassive_e10800:-:*:*:*:*:*:*:* | not specified by NVD | Running on | SonicWall |
- cpe:2.3:h:sonicwall:nsa_9250:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsa_9450:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsa_9650:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz270:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz270w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz300:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz300p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz300w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz350:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz350w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz370:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz370w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz400w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz470:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz470w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz500w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz570:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz570p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz570w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz600:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz600p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:tz670:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:* Versions up to 7.0.1-r.1219 Vulnerable ·SonicWall
- cpe:2.3:h:sonicwall:nsv_10:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsv_100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsv_1600:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsv_200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsv_25:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsv_270:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsv_300:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsv_400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsv_470:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsv_50:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsv_800:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nsv_870:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:* Versions up to 7.0.1-r514 Vulnerable ·SonicWall
- cpe:2.3:h:sonicwall:nssp_12400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nssp_12800:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nssp_13700:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:nssp_15700:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:* Versions up to 5.9.1.13 Vulnerable ·SonicWall
- cpe:2.3:h:sonicwall:soho_250:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:soho_250w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:* Versions up to 6.5.1.12 Vulnerable ·SonicWall
- cpe:2.3:h:sonicwall:supermassive_9800:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:* Versions up to 6.5.4.7 Vulnerable ·SonicWall
- cpe:2.3:h:sonicwall:supermassive_9200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:supermassive_9400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:supermassive_9600:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:* Versions all versions; up to 6.0.5.3-94o Vulnerable ·SonicWall
- cpe:2.3:h:sonicwall:supermassive_e10200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:supermassive_e10400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
- cpe:2.3:h:sonicwall:supermassive_e10800:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·SonicWall
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-20027
- 2026-10-03 Alias added: GHSA-j2f2-fj3p-8c94
References
More SonicWall Sonicos vulnerabilities
- TI-2020-04229 Buffer overflow in SonicWall SonicOS KEVCVSS 3.1CRITICAL 9.8
- 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
Sources
- CVE-2021-20027 · CVE Program
- CVE-2021-20027 · NVD
- FIRST EPSS
- GHSA-j2f2-fj3p-8c94 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences