CVE-2022-22177Network attack vector

SNMP service crash via crafted packet sequence

Published Jan 19, 2022 · Updated Sep 16, 2024

Denial of service in the snmpd daemon in Juniper Networks Junos OS and Junos OS Evolved allows remote attackers to halt SNMP service. After a specific number of crafted SNMP packets, snmpd releases memory illegally and terminates with SIGSEGV. SNMP must be enabled; all protocol versions are affected, and service remains unavailable until an administrator manually restarts the daemon.

CVSS severity5.3
Medium
EPSS probability0.96%
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 snmpd daemon in Juniper Networks Junos OS and Junos OS Evolved allows remote attackers to halt SNMP service. After a specific number of crafted SNMP packets, snmpd releases memory illegally and terminates with SIGSEGV. SNMP must be enabled; all protocol versions are affected, and service remains unavailable until an administrator manually restarts the daemon.

The record

CVE
CVE-2022-22177
Published
Jan 19, 2022
Updated
Sep 16, 2024
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-755, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=21.3 <21.3R2-EVO
  2. Affected versionversion=unspecified <21.2R3-EVO

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=21.3 <21.3R2-EVO; version=unspecified <21.2R3-EVO
Juniper Networks · Junos OSversion=12.3 <12.3R12-S20; version=15.1 <15.1R7-S11; version=18.3 <18.3R3-S6; version=18.4 <18.4R2-S9, 18.4R3-S10; version=19.1 <19.1R2-S3, 19.1R3-S7; version=19.2 <19.2R1-S8, 19.2R3-S4; version=19.3 <19.3R3-S4; version=19.4 <19.4R2-S5, 19.4R3-S6; version=20.1 <20.1R3-S2; version=20.2 <20.2R3-S3; version=20.3 <20.3R3-S1; version=20.4 <20.4R3; version=21.1 <21.1R2-S2, 21.1R3; version=21.2 <21.2R1-S2, 21.2R2

Published CVSS scores

5.3Juniper Networks, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NIST NVDCVSS: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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-755Improper Handling of Exceptional Conditions
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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