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CVE-2023-28974

Junos OS: MX Series: In a BBE scenario upon receipt of specific malformed packets from subscribers the process bbe-smgd will crash

High7.4EPSS 0.30%
Published
Updated
Reserved
Assigned by
juniper

Description

An Improper Check for Unusual or Exceptional Conditions vulnerability in the bbe-smgd of Juniper Networks Junos OS allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS). In a Broadband Edge / Subscriber Management scenario on MX Series when a specifically malformed ICMP packet addressed to the device is received from a subscriber the bbe-smgd will crash, affecting the subscriber sessions that are connecting, updating, or terminating. Continued receipt of such packets will lead to a sustained DoS condition. When this issue happens the below log can be seen if the traceoptions for the processes smg-service are enabled: BBE_TRACE(TRACE_LEVEL_INFO, "%s: Dropped unsupported ICMP PKT ... This issue affects Juniper Networks Junos OS on MX Series: All versions prior to 19.4R3-S11; 20.2 versions prior to 20.2R3-S7; 20.3 versions prior to 20.3R3-S6; 20.4 versions prior to 20.4R3-S6; 21.1 versions prior to 21.1R3-S4; 21.2 versions prior to 21.2R3-S4; 21.3 versions prior to 21.3R3-S3; 21.4 versions prior to 21.4R3-S2; 22.1 versions prior to 22.1R2-S2, 22.1R3; 22.2 versions prior to 22.2R2; 22.3 versions prior to 22.3R1-S2, 22.3R2.

Timeline

  1. ID reserved

    By juniper

  2. · 19 days later

    Published

  3. · 22 months 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-2023-28974, by who scored it
Scored byCVSSScoreVector
juniperCNA (assigner)3.1High7.4CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVDNVD · Modified3.1Medium6.5CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.30% · top 77% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.4.

Weakness

Affected products

  • Juniper Networks · Junos OS

    • affected unspecified – < 19.4R3-S11
    • affected 20.2 – < 20.2R3-S7
    • affected 20.3 – < 20.3R3-S6
    • affected 20.4 – < 20.4R3-S6
    • affected 21.1 – < 21.1R3-S4
    • affected 21.2 – < 21.2R3-S4
    • affected 21.3 – < 21.3R3-S3
    • affected 21.4 – < 21.4R3-S2
    • affected 22.1 – < 22.1R2-S2, 22.1R3
    • affected 22.2 – < 22.2R2
    • affected 22.3 – < 22.3R1-S2, 22.3R2

What to do

Solution: The following software releases have been updated to resolve this specific issue: 19.4R3-S11, 20.2R3-S7, 20.3R3-S6, 20.4R3-S6, 21.1R3-S4, 21.2R3-S4, 21.3R3-S3, 21.4R3-S2, 22.1R2-S2, 22.1R3, 22.2R2, 22.3R1-S2, 22.3R2, 22.4R1, and all subsequent releases.

Workaround: There are no known 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 .