Security readout for executives and security teams
Plain-English summary
This Juniper issue can let a low-privileged local user crash a routing platform component by invoking a chassis status command during narrow timing conditions. The business impact is availability, not data theft. It is limited to Junos OS Evolved on PTX10003 and PTX10008 before 20.1R2-EVO; classic Junos OS is stated as unaffected.
Executive priority
Treat this as a targeted availability risk for specific Juniper core routing platforms. Prioritize remediation where PTX10003 or PTX10008 devices support critical connectivity or have broad CLI access, but this is not a broad remote compromise issue based on the provided evidence.
Technical view
CVE-2021-0298 is a race condition in the Junos OS Evolved `show chassis pic` path. Under precise concurrent system events, the command can crash the FPC port interface concentrator daemon, causing denial of service. CVSS is 4.7 with local access, high complexity, low privileges, no user interaction, and high availability impact.
Likely exposure
Exposure appears limited to operators running Juniper PTX10003 or PTX10008 with Junos OS Evolved versions earlier than 20.1R2-EVO. The source bundle does not identify other platforms, CPEs, cloud services, or classic Junos OS exposure.
Exploitation context
The source bundle does not show KEV listing or active exploitation. Exploitation requires local CLI access, low privileges, and timing with system events outside the attacker's control. Repeated execution under precise conditions could sustain denial of service, but the public sources provided do not indicate remote exploitation.
Researcher notes
The vulnerability hinges on CWE-362 race timing in a local CLI command path. Evidence supports platform and version scoping, availability impact, and high attack complexity. The bundle does not provide exploit artifacts, workaround details, or evidence of exploitation in the wild.
Mitigation direction
- Upgrade affected PTX10003 and PTX10008 systems to Junos OS Evolved 20.1R2-EVO or later.
- Check Juniper advisory JSA11212 for current vendor remediation guidance.
- Restrict CLI access to trusted administrators while remediation is pending.
- Monitor for picd crashes, FPC instability, or repeated chassis PIC command usage.
Validation and detection
- Inventory PTX10003 and PTX10008 devices and record installed Junos OS Evolved versions.
- Flag any Junos OS Evolved release earlier than 20.1R2-EVO as affected.
- Confirm classic Junos OS devices are not treated as affected by this CVE.
- Review logs and core files for picd crashes on FPCs.
- Avoid production reproduction attempts; validate through version and log review.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-362: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-0298 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H13.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.7MediumVector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.juniper.net/JSA11212CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.