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CVE-2018-0057

Junos OS: authd allows assignment of IP address requested by DHCP subscriber logging in with Option 50 (Requested IP Address)

Medium6.1EPSS 1.1%
Published
Updated
Reserved
Assigned by
juniper

Description

On MX Series and M120/M320 platforms configured in a Broadband Edge (BBE) environment, subscribers logging in with DHCP Option 50 to request a specific IP address will be assigned the requested IP address, even if there is a static MAC to IP address binding in the access profile. In the problem scenario, with a hardware-address and IP address configured under address-assignment pool, if a subscriber logging in with DHCP Option 50, the subscriber will not be assigned an available address from the matched pool, but will still get the requested IP address. A malicious DHCP subscriber may be able to utilize this vulnerability to create duplicate IP address assignments, leading to a denial of service for valid subscribers or unauthorized information disclosure via IP address assignment spoofing. Affected releases are Juniper Networks Junos OS: 15.1 versions prior to 15.1R7-S2, 15.1R8; 16.1 versions prior to 16.1R4-S12, 16.1R7-S2, 16.1R8; 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 17.2R1-S7, 17.2R2-S6, 17.2R3; 17.3 versions prior to 17.3R2-S4, 17.3R3; 17.4 versions prior to 17.4R2; 18.1 versions prior to 18.1R2-S3, 18.1R3.

Scores

CVSS scores of CVE-2018-0057, by who scored it
Scored byCVSSScoreVector
juniperCNA (assigner)3.0Medium6.1CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:L
NVDNVD · Modified3.0Critical9.6CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H
EPSS (exploitation in 30 days)
1.1% · top 33% 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 6.1.

Weakness

  • Information disclosure
  • Denial of service

Affected products

  • Juniper Networks · Junos OS

    • affected 15.1 – < 15.1R7-S2, 15.1R8
    • affected 16.1 – < 16.1R4-S12, 16.1R7-S2, 16.1R8
    • affected 16.2 – < 16.2R2-S7, 16.2R3
    • affected 17.1 – < 17.1R2-S9, 17.1R3
    • affected 17.2 – < 17.2R1-S7, 17.2R2-S6, 17.2R3
    • affected 17.3 – < 17.3R2-S4, 17.3R3
    • affected 17.4 – < 17.4R2
    • affected 18.1 – < 18.1R2-S3, 18.1R3

What to do

Solution: The following software releases have been updated to resolve this specific issue: 15.1R7-S2, 15.1R8, 16.1R4-S12, 16.1R7-S2, 16.1R8, 16.2R2-S7, 16.2R3, 17.1R2-S9, 17.1R3, 17.2R1-S7, 17.2R2-S6, 17.2R3, 17.3R2-S4, 17.3R3, 17.4R2, 18.1R2-S3, 18.1R3, 18.2R1, 18.3R1, 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 (1)

Sources

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

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Record last updated .