CVE record · CVE-2021-31351

Junos OS: MX Series: Receipt of specific packet on MS-MPC/MS-MIC causes line card reset

CVSS 7.5 HighEPSS 0.010 · 63rd percentile

Published by the CVE Program (CNA: juniper) at 19 Oct 2021, 18:16 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Juniper Networks	Junos OS	unaffected unspecified to before 15.1 custom unaffected 17.3 to before 17.3R3-S11 custom unaffected 17.4R3 to before 17.4* custom
Juniper Networks	Junos OS	affected 17.3R3-S11 affected 18.1R3-S12 affected 18.3R3-S4 affected 18.4R3-S7 affected 19.1R3-S4, 19.1R3-S5 affected 19.2R1-S6 affected 19.3R3-S2 affected 19.4R3-S2 affected 20.1R2-S1 affected 20.2R3 affected 20.3R2 affected 17.4R2-S13 to before 17.4* custom and 7 more

Identifiers: CVE-2021-31351
CNA: juniper
Weakness (CWE): CWE-754
Tags: Juniper Networks Junos OS
CWE-754
Published: 19 Oct 2021
Updated: 17 Sept 2024

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.5	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CNA (juniper)

CISA KEV Not listed.
EPSS 0.010, the 63rd percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 19 Oct 2021. New records show when each source confirmed them.

Sources

References from the CNA

kb.juniper.net/JSA11216 confirm

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.