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CVE-2022-22185

Junos OS: SRX Series: Denial of service vulnerability in flowd daemon upon receipt of a specific fragmented packet

High7.5EPSS 0.97%
Published
Updated
Reserved
Assigned by
juniper

Description

A vulnerability in Juniper Networks Junos OS on SRX Series, allows a network-based unauthenticated attacker to cause a Denial of Service (DoS) by sending a specific fragmented packet to the device, resulting in a flowd process crash, which is responsible for packet forwarding. Continued receipt and processing of this specific packet will create a sustained DoS condition. This issue only affects SRX Series when 'preserve-incoming-fragment-size' feature is enabled. This issue affects Juniper Networks Junos OS on SRX Series: 18.3 versions prior to 18.3R3-S6; 18.4 versions prior to 18.4R3-S10; 19.1 versions prior to 19.1R3-S7; 19.2 versions prior to 19.2R3-S4; 19.3 versions prior to 19.3R3-S4; 19.4 versions prior to 19.4R3-S6; 20.1 versions prior to 20.1R3-S2; 20.2 versions prior to 20.2R3-S3; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2-S1, 21.1R3; 21.2 versions prior to 21.2R2. This issue does not affect Juniper Networks Junos OS prior to 17.3R1.

Timeline

  1. ID reserved

    By juniper

  2. · 4 months later

    Published

  3. · 2 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-2022-22185, by who scored it
Scored byCVSSScoreVector
juniperCNA (assigner)3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Modified3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.97% · top 38% of all CVEs (7 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

Affected products

  • Juniper Networks · Junos OS

    • affected unspecified – < 18.3R3-S6
    • unaffected unspecified – < 17.3R1
    • affected 17.3R1 – < 17.3*
    • affected 18.4 – < 18.4R3-S10
    • affected 19.1 – < 19.1R3-S7
    • affected 19.2 – < 19.2R3-S4
    • affected 19.3 – < 19.3R3-S4
    • affected 19.4 – < 19.4R3-S6
    • affected 20.1 – < 20.1R3-S2
    • affected 20.2 – < 20.2R3-S3
    • affected 20.3 – < 20.3R3-S1
    • affected 20.4 – < 20.4R3
    • affected 21.1 – < 21.1R2-S1, 21.1R3
    • affected 21.2 – < 21.2R2

What to do

Solution: The following software releases have been updated to resolve this specific issue: 18.3R3-S6, 18.4R3-S10, 19.1R3-S7, 19.2R3-S4, 19.3R3-S4, 19.4R3-S6, 20.1R3-S2, 20.2R3-S3, 20.3R3-S1, 20.4R3, 21.1R2-S1, 21.1R3, 21.2R2, 21.3R1, and all subsequent releases.

Workaround: An administrator can disable the feature preserve-incoming-fragment-size to avoid this issue: user@host# delete security flow preserve-incoming-fragment-size user@host# commit

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 .