CVE-2020-5135 kev+ ransomware in the critical feed json
A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code…
published 2020-10-12 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-26382
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Exploited
- added 2022-03-15, used in ransomware
- epss
- 26.9%
- EPSS 26.9% chance of exploitation in 30 days, percentile 98%
- public exploits
- 0
- none known
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.
Patch / fix
cisa required action Apply updates per vendor instructions.
Timeline
- Published
- Added to CISA KEV
- CISA patch deadline
- CISA SSVC: exploitation active
Known exploited
- Added
- 4 y ago
- Patch by
- 2022-04-05 (4 y ago)
- Ransomware
- Known to be used in ransomware campaigns
- Required action
- Apply updates per vendor instructions.
- Vendor, product
- SonicWall, SonicOS
- CISA name
- SonicWall SonicOS Buffer Overflow Vulnerability
Ransomware
Groups reported to have exploited it in intrusions.
- Babuk ransomware gang
reported by coveware.com
Ransomware Vulnerability Matrix by BushidoUK (github.com/BushidoUK/Ransomware-Vulnerability-Matrix), reformatted per CVE. CC BY 4.0
CISA SSVC
- Exploitation
- Active, exploited in the wild
- Automatable
- yes
- Technical impact
- total
- Assessed
- 21 mo ago
Exploit prediction
26.87% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Affected products
- SonicWall SonicOS
Classification
- Weakness
-
- CWE-120 Buffer Copy without Checking Size of Input
References
-
psirt.global.sonicwall.com
/vuln-detail/SNWLID-2020-0010
vendor-advisory
-
cisa.gov
/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-5135
government-resource, us-government-resource
Sources
- CVE List CVE-2020-5135
- NVD CVE-2020-5135
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.