01 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.

HighPUBLISHEDCNA: juniper

CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

View raw JSON

02 Description

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.

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 1.33% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 70.9% of scored records. A rank, not a probability.
NVD base score: 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD analysis status: Modified. NVD last modified this record on 2026-06-17.
Red Hat severity: No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2021-10-19 18:17Z5 YR AGO

Last updated

2024-09-16 22:56Z2 YR AGO

Reserved

2021-04-15

Assigning CNA

juniper

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses

CWE-696Incorrect Behavior OrderClass

Data version

5.1

Document digest

cd1c480cf33c8774f4302175efe79a968730335ff132bdaba1185109fd319583

05 Affected products

VendorProductVersionsPlatforms

Juniper NetworksJunos OS17.2R1 to < 17.2*, 17.3 to < 17.3R3-S9, 17.4 to < 17.4R2-S12, 17.4R3-S3, 18.1 to < 18.1R3-S11, 18.2 to < 18.2R2-S6, 18.2R3-S3, 18.3 to < 18.3R2-S4, 18.3R3-S1, 18.4 to < 18.4R1-S8, 18.4R2-S5, 18.4R3, 19.1 to < 19.1R1-S6, 19.1R2-S2, 19.1R3, 19.2 to < 19.2R1-S5, 19.2R2, 19.3 to < 19.3R2-S5, 19.3R3MX Series

06 References

kb.juniper.nethttps://kb.juniper.net/JSA11247x_refsource_CONFIRM
www.juniper.nethttps://www.juniper.net/documentation/en_US/junos/topics/topic-map/map-e-configuring.htmlx_refsource_MISC

07 Remediation

The following software releases have been updated to resolve this specific issue: 17.3R3-S9, 17.4R2-S12, 17.4R3-S3, 18.1R3-S11, 18.2R2-S6, 18.2R3-S3, 18.3R2-S4, 18.3R3-S1, 18.4R1-S8, 18.4R2-S5, 18.4R3, 19.1R1-S6, 19.1R2-S2, 19.1R3, 19.2R1-S5, 19.2R2, 19.3R2-S5, 19.3R3, 19.4R1, and all subsequent releases.