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CVE Record

CVE-2021-0245: Junos OS: Junos Fusion: Hard-coded credentials on satellite devices allows a locally authenticated attacker to elevate their privileges.

A Use of Hard-coded Credentials vulnerability in Juniper Networks Junos OS on Junos Fusion satellite devices allows an attacker who is local to the device to elevate their privileges and take control of the device. This issue affects: Juniper Networks Junos OS Junos Fusion Satellite Devices. 16.1 versions prior to 16.1R7-S7; 17.1 versions prior to 17.1R2-S12, 17.1R3-S2; 17.2 versions prior to 17.2R3-S4; 17.3 versions prior to 17.3R3-S8; 17.4 versions prior to 17.4R2-S10; 17.4 version 17.4R3 and later versions; 18.1 versions prior to 18.1R3-S10; 18.2 versions prior to 18.2R2-S7, 18.2R3-S3; 18.3 versions prior to 18.3R1-S7, 18.3R2-S4, 18.3R3-S2; 18.4 versions prior to 18.4R1-S6, 18.4R2-S4, 18.4R3-S1; 19.1 versions prior to 19.1R1-S5, 19.1R2-S1, 19.1R3; 19.2 versions prior to 19.2R1-S4, 19.2R2; 19.3 versions prior to 19.3R2-S5, 19.3R3; 19.4 versions prior to 19.4R1-S1, 19.4R2; 20.1 versions prior to 20.1R1-S1, 20.1R2. This issue does not affected Junos OS releases prior to 16.1R1 or all 19.2R3 and 19.4R3 release versions.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This flaw affects Juniper Junos Fusion satellite devices. Because hard-coded credentials exist on affected Junos OS releases, someone who already has local authenticated access could become more privileged and take over the device. The business risk is high where these devices support production network infrastructure.

Executive priority

Treat as a high-priority infrastructure remediation where Junos Fusion is deployed. It is not described as remotely exploitable or actively exploited in the supplied sources, but device takeover risk justifies timely upgrade planning.

Technical view

CVE-2021-0245 is CWE-798 in Junos OS on Junos Fusion satellite devices. The CVSS 3.1 score is 7.8 with local attack vector, low complexity, low privileges, no user interaction, and high confidentiality, integrity, and availability impact.

Likely exposure

Exposure is limited to Juniper Networks Junos Fusion satellite devices running affected Junos OS 16.1 through 20.1 release trains. The bundle states releases before 16.1R1, all 19.2R3, and all 19.4R3 releases are not affected.

Exploitation context

The provided sources do not show CISA KEV listing or active exploitation. The attacker must already be locally authenticated to the device, but successful exploitation can elevate privileges and allow device takeover.

Researcher notes

The evidence supports local privilege escalation through hard-coded credentials on Junos Fusion satellite devices only. Do not generalize to all Junos OS deployments. Validate branch-specific fixed releases against Juniper JSA11138 before closure.

Mitigation direction

  • Identify all Junos Fusion satellite devices in production and lab environments.
  • Upgrade affected Junos OS releases to fixed versions referenced by Juniper JSA11138.
  • Prioritize devices supporting critical routing, switching, or management paths.
  • Restrict and review local authenticated access until remediation is complete.
  • Check Juniper guidance for any branch-specific upgrade constraints.

Validation and detection

  • Confirm whether each device is a Junos Fusion satellite device.
  • Record exact Junos OS release and compare it with affected ranges.
  • Verify remediated devices run a fixed or unaffected release.
  • Review local account access for unnecessary or stale users.
  • Document exceptions and compensating controls for delayed upgrades.
Prepared
Confidence
high
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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

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cwe · medium confidence lookup

CWE-798: Credential and account abuse lookup

Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. 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.

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cve · low confidence lookup

CVE-2021-0245 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

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

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2021-0245Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Juniper NetworksJunos OS16.1, 17.1, 17.2, 17.3, 17.4, 18.1, 18.2, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4, 20.1Listed
Weakness

CWE details

CWE-798

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.