CVE-2020-1613Network attack vector

BGP session termination via crafted FlowSpec advertisement

Published Apr 8, 2020 · Updated Sep 16, 2024

Denial of service in Juniper Networks Junos OS allows remote attackers to terminate an established BGP session via a FlowSpec advertisement. The BGP FlowSpec implementation responds to a specific received IPv4 or IPv6 advertisement with a BGP NOTIFICATION that closes the originating peer session; Juniper has not disclosed the underlying parsing or validation error. Exploitation requires an established BGP peer and a FlowSpec deployment, and propagation can terminate downstream sessions on vulnerable devices.

CVSS severity8.6
High
EPSS probability1.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Juniper Networks Junos OS allows remote attackers to terminate an established BGP session via a FlowSpec advertisement. The BGP FlowSpec implementation responds to a specific received IPv4 or IPv6 advertisement with a BGP NOTIFICATION that closes the originating peer session; Juniper has not disclosed the underlying parsing or validation error. Exploitation requires an established BGP peer and a FlowSpec deployment, and propagation can terminate downstream sessions on vulnerable devices.

The record

CVE
CVE-2020-1613
Published
Apr 8, 2020
Updated
Sep 16, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-710, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=12.3
  2. Affected versionversion=12.3X48
  3. Affected versionversion=14.1X53
  4. Affected versionversion=15.1 <15.1R7-S5
  5. Affected versionversion=15.1F <15.1F6-S13
  6. Affected versionversion=15.1X49 <15.1X49-D180
  7. Affected versionversion=15.1X53 <15.1X53-D238
  8. Affected versionversion=15.1X53 <15.1X53-D497
  9. Affected versionversion=15.1X53 <15.1X53-D592
  10. Affected versionversion=16.1 <16.1R7-S7
  11. Affected versionversion=17.1 <17.1R2-S12, 17.1R3
  12. Affected versionversion=17.2 <17.2R2-S7, 17.2R3
  13. Affected versionversion=17.2X75 <17.2X75-D102, 17.2X75-D110, 17.2X75-D44
  14. Affected versionversion=17.3 <17.3R2-S5, 17.3R3-S5
  15. Affected versionversion=17.4 <17.4R1-S8, 17.4R2
  16. Affected versionversion=18.1 <18.1R2-S4, 18.1R3
  17. Affected versionversion=18.2X75 <18.2X75-D20

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=12.3; version=12.3X48; version=14.1X53; version=15.1 <15.1R7-S5; version=15.1F <15.1F6-S13; version=15.1X49 <15.1X49-D180; version=15.1X53 <15.1X53-D238; version=15.1X53 <15.1X53-D497; version=15.1X53 <15.1X53-D592; version=16.1 <16.1R7-S7; version=17.1 <17.1R2-S12, 17.1R3; version=17.2 <17.2R2-S7, 17.2R3; version=17.2X75 <17.2X75-D102, 17.2X75-D110, 17.2X75-D44; version=17.3 <17.3R2-S5, 17.3R3-S5; version=17.4 <17.4R1-S8, 17.4R2; version=18.1 <18.1R2-S4, 18.1R3; version=18.2X75 <18.2X75-D20

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
8.6Juniper NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-710Improper Adherence to Coding Standards
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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