01 Record

CVE-2021-0264

Junos OS and Junos OS Evolved: MX Series with MPC10/MPC11, PTX10003, PTX10008: Line card may crash and restart when traffic is hitting a firewall filter having a term with syslog action configured

MediumPUBLISHEDCNA: juniper

CNA base score5.9 CVSS v3.xCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

View raw JSON

02 Description

Junos OS and Junos OS Evolved: MX Series with MPC10/MPC11, PTX10003, PTX10008: Line card may crash and restart when traffic is hitting a firewall filter having a term with syslog action configured

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: 0.98% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 61.8% 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

2021-04-22 19:37Z5 YR AGO

Last updated

2024-09-16 20:37Z2 YR AGO

Reserved

2020-10-27

Assigning CNA

juniper

Record state

PUBLISHED

Severity

Medium (CVSS 5.9)

CNA CVSS vector

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

Weaknesses

CWE-703Improper Check or Handling of Exceptional ConditionsPillar
CWE-755Improper Handling of Exceptional ConditionsClass

Data version

5.1

Document digest

8f996c526c37d2a6c28db7acd981b1e54b30d53632a8841c5e8c5f40d730324a

05 Affected products

VendorProductVersionsPlatforms

Juniper NetworksJunos OS19.3 to < 19.3R3-S2, 19.4 to < 19.4R3-S2, 20.1 to < 20.1R3, 20.2 to < 20.2R2-S2, 20.2R3, 20.3 to < 20.3R3, 20.4 to < 20.4R2MX Series

Juniper NetworksJunos OS Evolved< 20.4R2-EVOPTX10003, PTX10008

06 References

kb.juniper.nethttps://kb.juniper.net/JSA11155x_refsource_MISC
kb.juniper.nethttps://kb.juniper.net/TSB17931x_refsource_MISC

07 Remediation

The following software releases have been updated to resolve this specific issue: Junos OS 19.4R3-S2, 20.1R3, 20.2R2-S2, 20.2R3, 20.3R3, 20.4R2, 21.1R1, and all subsequent releases. Junos OS Evolved 20.4R2-EVO, 21.1R1-EVO, and all subsequent releases.