CVE-2020-1607Network attack vector

Session hijacking via injected J-Web script

Published Jan 15, 2020 · Updated Sep 16, 2024

Cross-site scripting in J-Web in affected Juniper Networks Junos OS releases allows remote attackers to hijack a target user's session. Juniper has not disclosed the affected input, code locus, or precise neutralization failure beyond insufficient XSS protection. Exploitation requires a targeted J-Web user to interact with attacker-controlled content and grants actions with that user's device privileges.

CVSS severity6.1
Medium
EPSS probability0.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in J-Web in affected Juniper Networks Junos OS releases allows remote attackers to hijack a target user's session. Juniper has not disclosed the affected input, code locus, or precise neutralization failure beyond insufficient XSS protection. Exploitation requires a targeted J-Web user to interact with attacker-controlled content and grants actions with that user's device privileges.

The record

CVE
CVE-2020-1607
Published
Jan 15, 2020
Updated
Sep 16, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 15, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=12.3 <12.3R12-S15
  2. Affected versionversion=12.3X48 <12.3X48-D86, 12.3X48-D90
  3. Affected versionversion=14.1X53 <14.1X53-D51
  4. Affected versionversion=15.1 <15.1R7-S5
  5. Affected versionversion=15.1F6 <15.1F6-S13
  6. Affected versionversion=15.1X49 <15.1X49-D181, 15.1X49-D190
  7. Affected versionversion=15.1X53 <15.1X53-D238
  8. Affected versionversion=15.1X53 <15.1X53-D592
  9. Affected versionversion=16.1 <16.1R4-S13, 16.1R7-S5
  10. Affected versionversion=16.2 <16.2R2-S10
  11. Affected versionversion=17.1 <17.1R2-S11, 17.1R3-S1
  12. Affected versionversion=17.2 <17.2R1-S9, 17.2R3-S2
  13. Affected versionversion=17.2R2
  14. Affected versionversion=17.3 <17.3R2-S5, 17.3R3-S5
  15. Affected versionversion=17.4 <17.4R2-S6, 17.4R3
  16. Affected versionversion=18.1 <18.1R3-S7
  17. Affected versionversion=18.2 <18.2R2-S5, 18.2R3
  18. Affected versionversion=18.3 <18.3R1-S6, 18.3R2-S1, 18.3R3
  19. Affected versionversion=18.4 <18.4R1-S5, 18.4R2
  20. Affected versionversion=19.1 <19.1R1-S2, 19.1R2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=12.3 <12.3R12-S15; version=12.3X48 <12.3X48-D86, 12.3X48-D90; version=14.1X53 <14.1X53-D51; version=15.1 <15.1R7-S5; version=15.1F6 <15.1F6-S13; version=15.1X49 <15.1X49-D181, 15.1X49-D190; version=15.1X53 <15.1X53-D238; version=15.1X53 <15.1X53-D592; version=16.1 <16.1R4-S13, 16.1R7-S5; version=16.2 <16.2R2-S10; version=17.1 <17.1R2-S11, 17.1R3-S1; version=17.2 <17.2R1-S9, 17.2R3-S2; version=17.2R2; version=17.3 <17.3R2-S5, 17.3R3-S5; version=17.4 <17.4R2-S6, 17.4R3; version=18.1 <18.1R3-S7; version=18.2 <18.2R2-S5, 18.2R3; version=18.3 <18.3R1-S6, 18.3R2-S1, 18.3R3; version=18.4 <18.4R1-S5, 18.4R2; version=19.1 <19.1R1-S2, 19.1R2

Published CVSS scores

7.5Juniper NetworksCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NVDAV:N/AC:M/Au:N/C:N/I:P/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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