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CVE record · CVE-2021-31379

Junos OS: MX Series: MPC 7/8/9/10/11 cards with MAP-E: PFE halts when an attacker sends malformed IPv4 or IPv6 traffic inside the MAP-E tunnel.

CVSS 7.5 HighEPSS 0.013 · 71st 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
VendorProductVersions
Juniper Networks Junos OS
  • unaffected unspecified to before 17.2R1 custom
  • affected 17.2R1 to before 17.2* custom
  • affected 17.3 to before 17.3R3-S9 custom
  • affected 17.4 to before 17.4R2-S12, 17.4R3-S3 custom
  • affected 18.1 to before 18.1R3-S11 custom
  • affected 18.2 to before 18.2R2-S6, 18.2R3-S3 custom
  • affected 18.3 to before 18.3R2-S4, 18.3R3-S1 custom
  • affected 18.4 to before 18.4R1-S8, 18.4R2-S5, 18.4R3 custom
  • affected 19.1 to before 19.1R1-S6, 19.1R2-S2, 19.1R3 custom
  • affected 19.2 to before 19.2R1-S5, 19.2R2 custom
  • affected 19.3 to before 19.3R2-S5, 19.3R3 custom
Identifiers
CVE-2021-31379
CNA
juniper
Weakness (CWE)
CWE-696
Tags
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

ScoreRatingCVSSVectorSource
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 0.013, the 71st percentile, on 5 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

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.