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CVE-2018-0002

MX series, SRX series: Junos OS: Denial of service vulnerability in Flowd on devices with ALG enabled.

High8.2EPSS 1.5%
Published
Updated
Reserved
Assigned by
juniper

Description

On SRX Series and MX Series devices with a Service PIC with any ALG enabled, a crafted TCP/IP response packet processed through the device results in memory corruption leading to a flowd daemon crash. Sustained crafted response packets lead to repeated crashes of the flowd daemon which results in an extended Denial of Service condition. Affected releases are Juniper Networks Junos OS: 12.1X46 versions prior to 12.1X46-D60 on SRX series; 12.3X48 versions prior to 12.3X48-D35 on SRX series; 14.1 versions prior to 14.1R9 on MX series; 14.2 versions prior to 14.2R8 on MX series; 15.1X49 versions prior to 15.1X49-D60 on SRX series; 15.1 versions prior to 15.1R5-S8, 15.1F6-S9, 15.1R6-S4, 15.1R7 on MX series; 16.1 versions prior to 16.1R6 on MX series; 16.2 versions prior to 16.2R3 on MX series; 17.1 versions prior to 17.1R2-S4, 17.1R3 on MX series. No other Juniper Networks products or platforms are affected by this issue.

Scores

CVSS scores of CVE-2018-0002, by who scored it
Scored byCVSSScoreVector
juniperCNA (assigner)3.0High8.2CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
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)
1.5% · top 25% of all CVEs (2 Nov 2026)

Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.2.

Weakness

Affected products

  • Juniper Networks · Junos OS

    • affected 12.1X46 – < 12.1X46-D60
    • affected 12.3X48 – < 12.3X48-D35
    • affected 15.1X49 – < 15.1X49-D60

  • Juniper Networks · Junos OS

    • affected 14.1 – < 14.1R9
    • affected 14.2 – < 14.2R8
    • affected 15.1 – < 15.1R5-S8, 15.1F6-S9, 15.1R6-S4, 15.1R7
    • affected 16.1 – < 16.1R6
    • affected 16.2 – < 16.2R3
    • affected 17.1 – < 17.1R2-S4, 17.1R3

What to do

Solution: The following software releases have been updated to resolve this specific issue: 12.1X46-D60, 12.3X48-D35, 14.1R9, 14.2R8, 15.1X49-D60, 15.1R5-S8, 15.1R6-S4, 15.1F6-S9, 15.1R7, 16.1R6, 16.2R3, 17.1R2-S4, 17.1R3, 17.2R1 and all subsequent releases.

Workaround: Disable IPv4 ALG's on affected devices.

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

References (2)

Sources

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Record last updated .