What is CVE-2021-20027?

CVE-2021-20027 is a high-severity vulnerability in Sonicwall Nsa_2650, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2021-06-14.

How severe is CVE-2021-20027?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Sonicwall Nsa_2650

CVE-2021-20027

A buffer overflow vulnerability in SonicOS allows a remote attacker to cause a Denial of Service (DoS) by sending a specially crafted request. This vulnerability affects SonicOS Gen5, Gen6, Gen7 platforms, and SonicOSv virtual firewalls.

Vulnerability class: Buffer Overflow

EPSS: 0.013 (67.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Weakness classification (CWE)

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

References

PSIRT@sonicwall.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2021-20027?: CVE-2021-20027 is a high-severity vulnerability in Sonicwall Nsa_2650, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2021-06-14.
How severe is CVE-2021-20027?: High severity. CVSS v3 base score is 7.5 out of 10.