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CVE Record

CVE-2020-1629: Junos OS: A race condition vulnerability may cause RPD daemon to crash when processing a BGP NOTIFICATION message.

A race condition vulnerability on Juniper Network Junos OS devices may cause the routing protocol daemon (RPD) process to crash and restart while processing a BGP NOTIFICATION message. This issue affects Juniper Networks Junos OS: 16.1 versions prior to 16.1R7-S6; 16.2 versions prior to 16.2R2-S11; 17.1 versions prior to 17.1R2-S11, 17.1R3-S1; 17.2 versions prior to 17.2R1-S9, 17.2R3-S3; 17.2 version 17.2R2 and later versions; 17.2X75 versions prior to 17.2X75-D105, 17.2X75-D110; 17.3 versions prior to 17.3R2-S5, 17.3R3-S6; 17.4 versions prior to 17.4R2-S7, 17.4R3; 18.1 versions prior to 18.1R3-S8; 18.2 versions prior to 18.2R3-S3; 18.2X75 versions prior to 18.2X75-D410, 18.2X75-D420, 18.2X75-D50, 18.2X75-D60; 18.3 versions prior to 18.3R1-S5, 18.3R2-S2, 18.3R3; 18.4 versions prior to 18.4R2-S2, 18.4R3; 19.1 versions prior to 19.1R1-S2, 19.1R2; 19.2 versions prior to 19.2R1-S4, 19.2R2. This issue does not affect Juniper Networks Junos OS prior to version 16.1R1.

MediumCVSS 5.9Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2020-1629 can make affected Juniper Junos OS routers restart their routing protocol daemon when handling a BGP NOTIFICATION message. The main business risk is routing instability or outage, not data theft. It is rated moderate because exploitation is network-based but has high complexity.

Executive priority

Treat as a planned network reliability fix. Prioritize internet-edge or critical routing infrastructure running affected Junos versions, especially where BGP instability could affect customer connectivity or business operations.

Technical view

A race condition in Junos OS RPD can trigger a crash and restart while processing a BGP NOTIFICATION message. The CVSS 3.1 score is 5.9 with network attack vector, no privileges, no user interaction, high attack complexity, and high availability impact only.

Likely exposure

Exposure is limited to Juniper Networks Junos OS releases in the affected 16.1 through 19.2 trains. Junos OS before 16.1R1 is listed as unaffected. Systems where RPD processes BGP are the practical focus.

Exploitation context

The provided sources do not state active exploitation, and the CVE is not marked KEV. The CVSS vector indicates remote network reachability but high attack complexity. Sources do not provide enough detail to confirm prerequisites such as peer state.

Researcher notes

The evidence supports availability impact through RPD crash and restart, not confidentiality or integrity compromise. Public details in the supplied bundle are limited; avoid assuming exploitability conditions beyond BGP NOTIFICATION processing and the CVSS vector.

Mitigation direction

  • Inventory Junos OS versions across routing devices.
  • Map each device to the affected release ranges in JSA11009.
  • Upgrade to the fixed or later release for that Junos train.
  • Check Juniper JSA11009 for current vendor guidance before change windows.

Validation and detection

  • Confirm device Junos OS version and train.
  • Identify whether BGP and RPD are operational on in-scope devices.
  • Review RPD crash or restart logs around BGP events.
  • Verify upgraded devices run a non-affected release listed by Juniper.
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

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cwe · low confidence lookup

CWE-366: Exact CWE lookup

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cve · low confidence lookup

CVE-2020-1629 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.9 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/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
5.9CVSS 3.1MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H2.23.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.9Medium
CVSS 3.1 vector shape for CVE-2020-1629Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/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, 16.2, 17.1, 17.2, 17.2X75, 17.3, 17.4, 18.1, 18.2, 18.2X75, 18.3, 18.4, 19.1, 19.2Listed
Weakness

CWE details

CWE-366

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