What is CVE-2020-5135?

CVE-2020-5135 is a vulnerability in Sonicwall Sonicos, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). Published 2020-10-12.

Is CVE-2020-5135 known to be exploited?

Yes. CVE-2020-5135 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-15), indicating it is being actively exploited. 7 public proof-of-concept repositories are indexed.

Buffer overflow in Sonicwall Sonicos

CVE-2020-5135

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…

Vulnerability class: Buffer Overflow

EPSS: 0.265 (96.4th percentile) — read the EPSS interpretation.

Affected products

Sonicwall Sonicos — versions SonicOS 6.5.4.7-79n and earlier, SonicOS 6.5.1.11-4n and earlier, SonicOS 6.0.5.3-93o and earlier

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-03-15. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-04-05.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

psirt.global.sonicwall.com/vuln-detail/SNWLID-2020-0010 (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2020-5135?: CVE-2020-5135 is a vulnerability in Sonicwall Sonicos, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). Published 2020-10-12.
Is CVE-2020-5135 known to be exploited?: Yes. CVE-2020-5135 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-15), indicating it is being actively exploited. 7 public proof-of-concept repositories are indexed.