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Known exploited vulnerability

CVE-2020-5135

criticalCVSS 3.1 9.8In CISA KEVRansomwareEPSS 27%Published · SonicWall

The short answer

CVE-2020-5135 affects SonicWall SonicOS and is rated critical (CVSS 9.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2022-03-15: attackers are using it, so patch it first.

What it is

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.

Weakness: CWE-120.

Severity

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploited (CISA KEV)

Yes, since Mar 15, 2022

Federal due date Apr 5, 2022

EPSS, next 30 days

27%

Higher than 98% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

Apply updates per vendor instructions.

Affected products

SonicOS. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2020-5135 being exploited?

Yes. CISA added CVE-2020-5135 to its Known Exploited Vulnerabilities catalog on 2022-03-15, with a federal remediation due date of 2022-04-05. CISA lists it as used in ransomware campaigns.

How do I fix CVE-2020-5135?

CISA's required action: Apply updates per vendor instructions.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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