CVE-2022-22198Network attack vector

Service-card crash via malformed SIP Contact header

Published Apr 14, 2022 · Updated Sep 17, 2024

Denial of service in the Junos OS SIP ALG on affected MX and SRX releases allows remote attackers to crash service cards. A SIP message with a specific Contact header format causes the ALG to access an uninitialized pointer, crashing an MS-MPC, MS-MIC, or SPC. SIP ALG must be enabled, and continued receipt of the crafted packets sustains the service interruption.

CVSS severity7.5
High
EPSS probability0.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Junos OS SIP ALG on affected MX and SRX releases allows remote attackers to crash service cards. A SIP message with a specific Contact header format causes the ALG to access an uninitialized pointer, crashing an MS-MPC, MS-MIC, or SPC. SIP ALG must be enabled, and continued receipt of the crafted packets sustains the service interruption.

The record

CVE
CVE-2022-22198
Published
Apr 14, 2022
Updated
Sep 17, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-824, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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
  2. Affected versionversion=21.1 <21.1R2-S1, 21.1R3
  3. Affected versionversion=21.2 <21.2R2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

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

Published CVSS scores

7.5Juniper Networks, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.1NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:C

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-824Access of Uninitialized Pointer
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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