CVE record · CVE-2021-0257

Junos OS: MX Series, EX9200 Series: Trio-based MPCs memory leak in VPLS with integrated routing and bridging (IRB) interface

CVSS 6.5 MediumEPSS 0.0040 · 34th percentile

Published by the CVE Program (CNA: juniper) at 22 Apr 2021, 19:37 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	affected 17.3 to before 17.3R3-S10 custom affected 17.4 to before 17.4R3-S3 custom affected 18.2 to before 18.2R3-S7 custom affected 18.3 to before 18.3R3-S4 custom affected 18.4 to before 18.4R3-S6 custom affected 19.2 to before 19.2R3-S2 custom affected 19.3 to before 19.3R3-S1 custom affected 19.4 to before 19.4R2-S2, 19.4R3 custom affected 20.2 to before 20.2R1-S3, 20.2R2 custom affected 20.3 to before 20.3R1-S1,, 20.3R2 custom
Juniper Networks	Junos OS	unaffected 18.1 unaffected 19.1 unaffected 17.3 to before 17.3R3-S8 custom unaffected 17.4 to before 17.4R3-S2 custom unaffected 18.2 to before 18.2R3-S4 custom unaffected 18.3 to before 18.3R3-S2 custom unaffected 18.4 to before 18.4R3-S1 custom unaffected 19.2 to before 19.2R2 custom unaffected 19.3 to before 19.3R3 custom unaffected 19.4 to before 19.4R2 custom

Identifiers: CVE-2021-0257
CNA: juniper
Weakness (CWE): CWE-400
Tags: Juniper Networks Junos OS
Denial of service
Published: 22 Apr 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
6.5	Medium	3.1	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CNA (juniper)

CISA KEV Not listed.
EPSS 0.0040, the 34th 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 22 Apr 2021. New records show when each source confirmed them.

Sources

References from the CNA

kb.juniper.net/JSA11148

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.