CVE-2020-5135 on CISA KEV

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

01What CISA says about this vulnerability

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.

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• psirt.global.sonicwall.com — https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2020-0010

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
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

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

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