CVE-2023-36833

FPC traffic loss via MoFRR use-after-free

Published Jul 14, 2023 · Updated Oct 22, 2024

Use-after-free in the PFE of Juniper Networks Junos OS Evolved allows adjacent unauthenticated attackers to crash an FPC. Repeated flaps on a MoFRR-enabled multicast-only interface cause aftman-bt to access freed memory, fail a sanity check, and crash. The affected PTX platform must use an LC1201 or LC1202 and enable MoFRR; the crash stops FPC forwarding until that card is rebooted.

CVSS severity6.5
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the PFE of Juniper Networks Junos OS Evolved allows adjacent unauthenticated attackers to crash an FPC. Repeated flaps on a MoFRR-enabled multicast-only interface cause aftman-bt to access freed memory, fail a sanity check, and crash. The affected PTX platform must use an LC1201 or LC1202 and enable MoFRR; the crash stops FPC forwarding until that card is rebooted.

The record

CVE
CVE-2023-36833
Published
Jul 14, 2023
Updated
Oct 22, 2024
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-416, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 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=21.2 <21.2* changes=[{"at":"21.2R1-EVO","status":"affected"}]
  2. Affected versionversion=21.3 <21.3* changes=[{"at":"21.3R1-EVO","status":"affected"}]
  3. Affected versionversion=21.4 <21.4R3-S3-EVO
  4. Affected versionversion=22.1 <22.1* changes=[{"at":"22.1R1-EVO","status":"affected"}]
  5. Affected versionversion=22.2 <22.2R3-S2-EVO
  6. Affected versionversion=22.3 <22.3R3-EVO
  7. Affected versionversion=22.4 <22.4R1-S2-EVO, 22.4R2-EVO

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=21.2 <21.2* changes=[{"at":"21.2R1-EVO","status":"affected"}]; version=21.3 <21.3* changes=[{"at":"21.3R1-EVO","status":"affected"}]; version=21.4 <21.4R3-S3-EVO; version=22.1 <22.1* changes=[{"at":"22.1R1-EVO","status":"affected"}]; version=22.2 <22.2R3-S2-EVO; version=22.3 <22.3R3-EVO; version=22.4 <22.4R1-S2-EVO, 22.4R2-EVO

Published CVSS scores

6.5Juniper Networks, Inc.CVSS:3.1/AV:A/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
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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