01 Record
CVE-2026-21912
Junos OS: MX10k Series: 'show system firmware' CLI command may lead to LC480 or LC2101 line card reset
MediumPUBLISHEDCNA: juniper
CNA base score6.8 CVSS v4.0CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/RE:M/U:Amber
02 Description
Junos OS: MX10k Series: 'show system firmware' CLI command may lead to LC480 or LC2101 line card reset
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.11% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 1.1% of scored records. A rank, not a probability.
- NVD base score
- 6.8 (CVSS v4.0), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:X/RE:M/U:Amber
- NVD analysis status
- Analyzed. 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
- 2026-01-15 20:24Z9 MO AGO
- Last updated
- 2026-01-15 20:50Z9 MO AGO
- Reserved
- 2026-01-05
- Assigning CNA
- juniper
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 6.8)
- CNA CVSS vector
- CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/RE:M/U:Amber
- Weaknesses
- CWE-367Time-of-check Time-of-use (TOCTOU) Race ConditionBase
- Data version
- 5.2
- Document digest
- 3f537a30945e1214f65e0cf0fbfdf04d175eee16c2ee732b57ae36985b4eb5df
05 Affected products
VendorProductVersionsPlatforms
Juniper NetworksJunos OS0 to < 21.2R3-S10, 21.4 to < 21.4R3-S9, 22.2 to < 22.2R3-S7, 22.4 to < 22.4R3-S6, 23.2 to < 23.2R2-S2, 23.4 to < 23.4R2-S3, 24.2 to < 24.2R2MX10k Series
06 References
- supportportal.juniper.nethttps://supportportal.juniper.net/JSA106011
- kb.juniper.nethttps://kb.juniper.net/JSA106011
07 Remediation
The following software releases have been updated to resolve this specific issue: Junos OS 21.2R3-S10, 21.4R3-S9, 22.2R3-S7, 22.4R3-S6, 23.2R2-S2, 23.4R2-S3, 24.2R2, 24.4R1, and all subsequent releases.