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CVE-2018-0061

Junos OS: Denial of service in telnetd

Description

A denial of service vulnerability in the telnetd service on Junos OS allows remote unauthenticated users to cause high CPU usage which may affect system performance. Affected releases are Juniper Networks Junos OS: 12.1X46 versions prior to 12.1X46-D81 on SRX Series; 12.3 versions prior to 12.3R12-S11; 12.3X48 versions prior to 12.3X48-D80 on SRX Series; 15.1 versions prior to 15.1R7; 15.1X49 versions prior to 15.1X49-D150, 15.1X49-D160 on SRX Series; 15.1X53 versions prior to 15.1X53-D59 on EX2300/EX3400 Series; 15.1X53 versions prior to 15.1X53-D68 on QFX10K Series; 15.1X53 versions prior to 15.1X53-D235 on QFX5200/QFX5110 Series; 15.1X53 versions prior to 15.1X53-D495 on NFX Series; 16.1 versions prior to 16.1R4-S12, 16.1R6-S6, 16.1R7; 16.2 versions prior to 16.2R2-S7, 16.2R3; 17.1 versions prior to 17.1R2-S9, 17.1R3; 17.2 versions prior to 17.2R2-S6, 17.2R3; 17.2X75 versions prior to 17.2X75-D100; 17.3 versions prior to 17.3R2-S4, 17.3R3; 17.4 versions prior to 17.4R1-S5, 17.4R2; 18.2X75 versions prior to 18.2X75-D5.

Timeline

  1. ID reserved

    By juniper

  2. · 11 months later

    Published

  3. · 6 years later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2018-0061, by who scored it
Scored byCVSSScoreVector
juniperCNA (assigner)3.0Medium5.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVDNVD · Modified3.0Medium5.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS (exploitation in 30 days)
2.3% · top 17% of all CVEs (10 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.

Affected products

  • Juniper Networks · Junos OS

    • affected 12.1X46 – < 12.1X46-D81
    • affected 12.3X48 – < 12.3X48-D80
    • affected 15.1X49 – < 15.1X49-D150, 15.1X49-D160

  • Juniper Networks · Junos OS

    • affected 12.3 – < 12.3R12-S11
    • affected 15.1 – < 15.1R7
    • affected 16.1 – < 16.1R4-S12, 16.1R6-S6, 16.1R7
    • affected 16.2 – < 16.2R2-S7, 16.2R3
    • affected 17.1 – < 17.1R2-S9, 17.1R3
    • affected 17.2 – < 17.2R2-S6, 17.2R3
    • affected 17.2X75 – < 17.2X75-D100
    • affected 17.3 – < 17.3R2-S4, 17.3R3
    • affected 17.4 – < 17.4R1-S5, 17.4R2
    • affected 18.2X75 – < 18.2X75-D5

  • Juniper Networks · Junos OS

    • affected 15.1X53 – < 15.1X53-D59

  • Juniper Networks · Junos OS

    • affected 15.1X53 – < 15.1X53-D68

  • Juniper Networks · Junos OS

    • affected 15.1X53 – < 15.1X53-D235

  • Juniper Networks · Junos OS

    • affected 15.1X53 – < 15.1X53-D495

What to do

Solution: The following software releases have been updated to resolve this specific issue: 12.1X46-D81, 12.3R12-S11, 12.3R13, 12.3X48-D80, 15.1R7, 15.1X49-D150, 15.1X49-D160, 15.1X53-D235, 15.1X53-D495, 15.1X53-D59, 15.1X53-D68, 16.1R4-S12, 16.1R6-S6, 16.1R7, 16.2R2-S7, 16.2R3, 17.1R2-S9, 17.1R3, 17.2R2-S6, 17.2R3, 17.2X75-D100, 17.2X75-D110, 17.3R2-S4, 17.3R3, 17.4R1-S5, 17.4R2, 18.1R1, 18.1R2, 18.2R1, 18.2X75-D5, and all subsequent releases.

Workaround: Disabling the telnet service will completely mitigate this issue.

Exploitation: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

References

2

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .