CVE record · CVE-2021-31374

Junos OS and Junos OS Evolved: RPD crash while processing a specially crafted BGP UPDATE or KEEPALIVE message.

CVSS 7.5 HighEPSS 0.010 · 63rd percentile

Published by the CVE Program (CNA: juniper) at 19 Oct 2021, 18:17 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-S11 custom affected 17.4 to before 17.4R2-S13, 17.4R3-S4 custom affected 18.1 to before 18.1R3-S12 custom affected 18.2 to before 18.2R2-S8, 18.2R3-S7 custom affected 18.3 to before 18.3R3-S4 custom affected 18.4 to before 18.4R1-S8, 18.4R2-S7, 18.4R3-S7 custom affected 19.1 to before 19.1R1-S6, 19.1R2-S2, 19.1R3-S4 custom affected 19.2 to before 19.2R1-S6, 19.2R3-S1 custom affected 19.3 to before 19.3R2-S5, 19.3R3-S1 custom affected 19.4 to before 19.4R1-S4, 19.4R2-S3, 19.4R3-S1 custom affected 20.1 to before 20.1R2 custom affected 20.2 to before 20.2R2 custom and 1 more
Juniper Networks	Junos OS Evolved	affected 20.3 to before 20.3R2-EVO custom

Identifiers: CVE-2021-31374
CNA: juniper
Weakness (CWE): CWE-787
Tags: Juniper Networks Junos OS
Juniper Networks Junos OS Evolved
Memory corruption
Published: 19 Oct 2021
Updated: 16 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 6 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/JSA11239 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.