CVE-2022-22155

Packet-processing outage via IPv6 neighbor flapping

Published Jan 19, 2022 · Updated Sep 17, 2024

Uncontrolled resource consumption in Junos OS on ACX5448 routers allows adjacent attackers to interrupt packet processing via IPv6 neighbor flaps. Neighbor state changes leak resources in the Flexible PIC Concentrator instead of releasing them after use. Precisely timed, continuous flapping exhausts FPC resources, sustains the outage, and requires a manual Packet Forwarding Engine restart.

CVSS severity6.5
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Junos OS on ACX5448 routers allows adjacent attackers to interrupt packet processing via IPv6 neighbor flaps. Neighbor state changes leak resources in the Flexible PIC Concentrator instead of releasing them after use. Precisely timed, continuous flapping exhausts FPC resources, sustains the outage, and requires a manual Packet Forwarding Engine restart.

The record

CVE
CVE-2022-22155
Published
Jan 19, 2022
Updated
Sep 17, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-400, CWE-772, T1499.002
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 19, 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

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=18.4 <18.4R3-S10
  2. Affected versionversion=19.1 <19.1R3-S5
  3. Affected versionversion=19.2 <19.2R1-S8, 19.2R3-S2
  4. Affected versionversion=19.3 <19.3R2-S6, 19.3R3-S2
  5. Affected versionversion=19.4 <19.4R1-S3, 19.4R2-S2, 19.4R3
  6. Affected versionversion=20.1 <20.1R2
  7. Affected versionversion=20.2 <20.2R1-S1, 20.2R2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=18.4 <18.4R3-S10; version=19.1 <19.1R3-S5; version=19.2 <19.2R1-S8, 19.2R3-S2; version=19.3 <19.3R2-S6, 19.3R3-S2; version=19.4 <19.4R1-S3, 19.4R2-S2, 19.4R3; version=20.1 <20.1R2; version=20.2 <20.2R1-S1, 20.2R2

Published CVSS scores

6.5Juniper NetworksCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.3NIST NVDAV:A/AC:L/Au:N/C:N/I:N/A:P

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-772Missing Release of Resource after Effective Lifetime
T1499.002Service Exhaustion Flood

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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