CVE-2017-10621

Junos OS: Denial of service vulnerability in telnetd

MEDIUM

5.3

CVSS Score

Published: October 13, 2017 at 05:00 PM UTC

Updated: June 17, 2026 at 01:00 AM UTC

1 product affected across 1 vendorJunos

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Severity

MEDIUM5.3

Exploit prediction

EPSS 2%

Description

A denial of service vulnerability in telnetd service on Juniper Networks Junos OS allows remote unauthenticated attackers to cause a denial of service. Affected Junos OS releases are: 12.1X46 prior to 12.1X46-D71; 12.3X48 prior to 12.3X48-D50; 14.1 prior to 14.1R8-S5, 14.1R9; 14.1X53 prior to 14.1X53-D50; 14.2 prior to 14.2R7-S9, 14.2R8; 15.1 prior to 15.1F2-S16, 15.1F5-S7, 15.1F6-S6, 15.1R5-S2, 15.1R6; 15.1X49 prior to 15.1X49-D90; 15.1X53 prior to 15.1X53-D47; 16.1 prior to 16.1R4-S1, 16.1R5; 16.2 prior to 16.2R1-S3, 16.2R2;

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Junos · Juniper Networks

95%

v < 12.1X46-D71v < 12.3X48-D50v < 14.1R8-S5v < 14.1X53-D50v < 14.2R7-S9v < 15.1F2-S16v < 15.1X49-D90v < 15.1X53-D47v < 16.1R4-S1v < 16.2R1-S312.1x4512.3x4814.114.1x5314.2 15.115.1x4915.1x5316.1 16.2

Affected range stops below 12.1X46-D71, so it looks safe — our inference, not a vendor statement

Affected range stops below 12.3X48-D50, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.1R8-S5, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.1X53-D50, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.2R7-S9, so it looks safe — our inference, not a vendor statement

Affected range stops below 15.1F2-S16, so it looks safe — our inference, not a vendor statement

Affected range stops below 15.1X49-D90, so it looks safe — our inference, not a vendor statement

Affected range stops below 15.1X53-D47, so it looks safe — our inference, not a vendor statement

Affected range stops below 16.1R4-S1, so it looks safe — our inference, not a vendor statement

Affected range stops below 16.2R1-S3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://kb.juniper.net/JSA10817

References (1)

x_refsource_CONFIRMMitigationVendor Advisory

Source: [email protected]

https://kb.juniper.net/JSA10817

CVSS

5.3MEDIUMjuniper

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: LOW

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-400

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