CVEs / CVE-2020-5135
CVE-2020-5135: SonicWall SonicOS Buffer Overflow Vulnerability
- Known exploited in the CISA KEV catalog since 15 Mar 2022
- critical 9.8 CVSS 3.1 (NVD)
- EPSS 26.8% chance of exploitation in the next 30 days, higher than 98% of CVEs (30 Oct 2026)
- Last changed at its sources
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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.
Description
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.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| SonicWall SonicOS | SonicOS 6.5.4.7-79n and earlier | — |
| SonicWall SonicOS | SonicOS 6.5.1.11-4n and earlier | — |
| SonicWall SonicOS | SonicOS 6.0.5.3-93o and earlier | — |
| SonicWall SonicOS | SonicOSv 6.5.4.4-44v-21-794 and earlier | — |
| SonicWall SonicOS | SonicOS 7.0.0.0-1 | — |
Exploitation
| In CISA KEV since | 15 Mar 2022 |
|---|---|
| Due date for US federal agencies | 5 Apr 2022 |
| Used in ransomware campaigns | Known |
| Required action | Apply updates per vendor instructions. |
Severity
| CVSS 3.1 | 9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HScored by NVD |
|---|---|
| Weakness | CWE-120 |
References
- CVE-2020-5135 on NVD
- CVE-2020-5135 in the CISA KEV catalog
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2020-0010 Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-5135 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.