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CVE-2018-0031

Junos OS: Receipt of specially crafted UDP packets over MPLS may bypass stateless IP firewall rules

Medium5.3EPSS 1.2%
Published
Updated
Reserved
Assigned by
juniper

Description

Receipt of specially crafted UDP/IP packets over MPLS may be able to bypass a stateless firewall filter. The crafted UDP packets must be encapsulated and meet a very specific packet format to be classified in a way that bypasses IP firewall filter rules. The packets themselves do not cause a service interruption (e.g. RPD crash), but receipt of a high rate of UDP packets may be able to contribute to a denial of service attack. This issue only affects processing of transit UDP/IP packets over MPLS, received on an interface with MPLS enabled. TCP packet processing and non-MPLS encapsulated UDP packet processing are unaffected by this issue. Affected releases are Juniper Networks Junos OS: 12.1X46 versions prior to 12.1X46-D76; 12.3 versions prior to 12.3R12-S10; 12.3X48 versions prior to 12.3X48-D66, 12.3X48-D70; 14.1X53 versions prior to 14.1X53-D47; 15.1 versions prior to 15.1F6-S10, 15.1R4-S9, 15.1R6-S6, 15.1R7; 15.1X49 versions prior to 15.1X49-D131, 15.1X49-D140; 15.1X53 versions prior to 15.1X53-D59 on EX2300/EX3400; 15.1X53 versions prior to 15.1X53-D67 on QFX10K; 15.1X53 versions prior to 15.1X53-D233 on QFX5200/QFX5110; 15.1X53 versions prior to 15.1X53-D471, 15.1X53-D490 on NFX; 16.1 versions prior to 16.1R3-S8, 16.1R4-S9, 16.1R5-S4, 16.1R6-S3, 16.1R7; 16.2 versions prior to 16.2R1-S6, 16.2R2-S5, 16.2R3; 17.1 versions prior to 17.1R1-S7, 17.1R2-S7, 17.1R3; 17.2 versions prior to 17.2R1-S6, 17.2R2-S4, 17.2R3; 17.2X75 versions prior to 17.2X75-D100; 17.3 versions prior to 17.3R1-S4, 17.3R2-S2, 17.3R3; 17.4 versions prior to 17.4R1-S3, 17.4R2; 18.1 versions prior to 18.1R2; 18.2X75 versions prior to 18.2X75-D5.

Scores

CVSS scores of CVE-2018-0031, 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:L/A:N
NVDNVD · Modified3.0Medium5.9CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
1.2% · top 31% of all CVEs (4 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.

Weakness

Affected products

  • Juniper Networks · Junos OS

    • affected 12.1X46 – < 12.1X46-D76
    • affected 12.3X48 – < 12.3X48-D66, 12.3X48-D70
    • affected 15.1X49 – < 15.1X49-D131, 15.1X49-D140

  • Juniper Networks · Junos OS

    • affected 12.3 – < 12.3R12-S10
    • affected 15.1 – < 15.1F6-S10, 15.1R4-S9, 15.1R6-S6, 15.1R7
    • affected 16.1 – < 16.1R3-S8, 16.1R4-S9, 16.1R5-S4, 16.1R6-S3, 16.1R7
    • affected 16.2 – < 16.2R1-S6, 16.2R2-S5, 16.2R3
    • affected 17.1 – < 17.1R1-S7, 17.1R2-S7, 17.1R3
    • affected 17.2 – < 17.2R1-S6, 17.2R2-S4, 17.2R3
    • affected 17.2X75 – < 17.2X75-D100
    • affected 17.3 – < 17.3R1-S4, 17.3R2-S2, 17.3R3
    • affected 17.4 – < 17.4R1-S3, 17.4R2
    • affected 18.1 – < 18.1R2
    • affected 18.2X75 – < 18.2X75-D5

  • Juniper Networks · Junos OS

    • affected 14.1X53 – < 14.1X53-D47

  • Juniper Networks · Junos OS

    • affected 15.1X53 – < 15.1X53-D59

  • Juniper Networks · Junos OS

    • affected 15.1X53 – < 15.1X53-D67

  • Juniper Networks · Junos OS

    • affected 15.1X53 – < 15.1X53-D233

  • Juniper Networks · Junos OS

    • affected 15.1X53 – < 15.1X53-D471, 15.1X53-D490

What to do

Solution: The following software releases have been updated to resolve this specific issue: 12.1X46-D76, 12.3X48-D66, 12.3X48-D70, 14.1X53-D47, 15.1F6-S10, 15.1R4-S9, 15.1R6-S6, 15.1R7, 15.1X49-D131, 15.1X49-D140, 15.1X53-D233, 15.1X53-D471, 15.1X53-D490, 15.1X53-D59, 15.1X53-D67, 16.1R3-S8, 16.1R4-S9, 16.1R5-S4, 16.1R6-S3, 16.1R7, 16.2R1-S6, 16.2R2-S5, 16.2R3, 17.1R1-S7, 17.1R2-S7, 17.1R3, 17.2R1-S6, 17.2R2-S4, 17.2R3, 17.2X75-D100, 17.3R1-S4, 17.3R2-S2, 17.3R3, 17.4R1-S3, 17.4R2, 18.1R2, 18.2R1, 18.2X75-D5, and all subsequent releases.

Workaround: There are no viable workarounds for 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 .