CVE-2020-5135
Actively exploited. CVE-2020-5135 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-15) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
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.
CSIRTS triage
- What
- 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.
- Who is affected
- All deployments of SonicWall SonicOS that are exposed to the internet.
- Urgency
- Remediation is urgent due to active exploitation and critical severity.
- Action
- Update to the latest version of SonicOS.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 98% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2020-5135: SonicWall SonicOS Buffer Overflow Vulnerabilitycisa-kev · 2022-03-15
External references
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