What is CVE-2021-0254?

CVE-2021-0254 is a critical-severity vulnerability in Juniper Junos, classified under Incorrect Calculation of Buffer Size. CVSS score: 9.8/10. Published 2021-04-22.

How severe is CVE-2021-0254?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Juniper Junos

CVE-2021-0254

A buffer size validation vulnerability in the overlayd service of Juniper Networks Junos OS may allow an unauthenticated remote attacker to send specially crafted packets to the device, triggering a partial Denial of Service (DoS) conditio…

EPSS: 0.026 (83.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Juniper Junos — versions 15.1, 17.3, 17.4
Juniper Networks Junos Os — versions 15.1, 17.3, 17.4

Weakness classification (CWE)

CWE-131 — Incorrect Calculation of Buffer Size
CWE-787 — Out-of-bounds Write

References

sirt@juniper.net (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2021-0254?: CVE-2021-0254 is a critical-severity vulnerability in Juniper Junos, classified under Incorrect Calculation of Buffer Size. CVSS score: 9.8/10. Published 2021-04-22.
How severe is CVE-2021-0254?: Critical severity. CVSS v3 base score is 9.8 out of 10.