CVE-2022-22175Network attack vector

Flowd crash via concurrent SIP message processing

Published Jan 19, 2022 · Updated Sep 16, 2024

Improper locking in the SIP ALG of Juniper Networks Junos OS allows remote attackers to crash flowd with concurrent SIP messages. Juniper has not disclosed which lock or shared resource the SIP ALG mishandles while flowd processes simultaneous messages. SIP ALG must be enabled, implicitly or by configuration; continued receipt of the packets sustains the service interruption.

CVSS severity7.5
High
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the SIP ALG of Juniper Networks Junos OS allows remote attackers to crash flowd with concurrent SIP messages. Juniper has not disclosed which lock or shared resource the SIP ALG mishandles while flowd processes simultaneous messages. SIP ALG must be enabled, implicitly or by configuration; continued receipt of the packets sustains the service interruption.

The record

CVE
CVE-2022-22175
Published
Jan 19, 2022
Updated
Sep 16, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-667, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 19, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=20.4 <20.4R3-S1
  2. Affected versionversion=21.1 <21.1R2-S2, 21.1R3
  3. Affected versionversion=21.2 <21.2R1-S2, 21.2R2
  4. Affected versionversion=21.3 <21.3R1-S1, 21.3R2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=20.4 <20.4R3-S1; version=21.1 <21.1R2-S2, 21.1R3; version=21.2 <21.2R1-S2, 21.2R2; version=21.3 <21.3R1-S1, 21.3R2

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
7.5Juniper NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
T1499.004Application or System Exploitation Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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