CVE-2023-28984

Junos OS: QFX Series: The PFE may crash when a lot of MAC addresses are being learned and aged

MEDIUM

5.3

CVSS Score

Published: April 17, 2023 at 12:00 AM UTC

Updated: June 17, 2026 at 05:49 AM UTC

27 products affected across 2 vendorsJunosQfx5200Qfx5110

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Severity

MEDIUM5.3

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

A Use After Free vulnerability in the Layer 2 Address Learning Manager (l2alm) of Juniper Networks Junos OS on QFX Series allows an adjacent attacker to cause the Packet Forwarding Engine to crash and restart, leading to a Denial of Service (DoS). The PFE may crash when a lot of MAC learning and aging happens, but due to a Race Condition (Concurrent Execution using Shared Resource with Improper Synchronization) that is outside the attackers direct control. This issue affects: Juniper Networks Junos OS versions prior to 19.4R3-S10 on QFX Series; 20.2 versions prior to 20.2R3-S7 on QFX Series; 20.3 versions prior to 20.3R3-S6 on QFX Series; 20.4 versions prior to 20.4R3-S5 on QFX Series; 21.1 versions prior to 21.1R3-S4 on QFX Series; 21.2 versions prior to 21.2R3-S3 on QFX Series; 21.3 versions prior to 21.3R3-S3 on QFX Series; 21.4 versions prior to 21.4R3 on QFX Series; 22.1 versions prior to 22.1R3 on QFX Series; 22.2 versions prior to 22.2R2 on QFX Series.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Junos · Juniper Networks

95%

v < 19.4R3-S1020.2 ≤ v < 20.2R3-S720.3 ≤ v < 20.3R3-S620.4 ≤ v < 20.4R3-S521.1 ≤ v < 21.1R3-S421.2 ≤ v < 21.2R3-S321.3 ≤ v < 21.3R3-S321.4 ≤ v < 21.4R322.1 ≤ v < 22.1R322.2 ≤ v < 22.2R220.2 20.2 r1 20.2 r1-s1 20.2 r1-s2 20.2 r1-s3 20.2 r2 20.2 r2-s1 20.2 r2-s2 20.2 r2-s3 20.2 r3 20.2 r3-s1 20.2 r3-s2 20.2 r3-s3 20.2 r3-s4 20.2 r3-s5 20.2 r3-s6 20.3 20.3 r1 20.3 r1-s1 20.3 r1-s2 20.3 r2 20.3 r2-s1 20.3 r3 20.3 r3-s1 20.3 r3-s2 20.3 r3-s3 20.3 r3-s4 20.3 r3-s5 20.4 20.4 r1 20.4 r1-s1 20.4 r2 20.4 r2-s1 20.4 r2-s2 20.4 r3 20.4 r3-s1 20.4 r3-s2 20.4 r3-s3 20.4 r3-s4 21.1 21.1 r1 21.1 r1-s1 21.1 r2 21.1 r2-s1 21.1 r2-s2 21.1 r3 21.1 r3-s1 21.1 r3-s2 21.1 r3-s3 21.2 21.2 r1 21.2 r1-s1 21.2 r1-s2 21.2 r2 21.2 r2-s1 21.2 r2-s2 21.2 r3 21.2 r3-s1 21.2 r3-s2 21.3 21.3 r1 21.3 r1-s1 21.3 r1-s2 21.3 r2 21.3 r2-s1 21.3 r2-s2 21.3 r3 21.3 r3-s1 21.3 r3-s2 21.4 21.4 r1 21.4 r1-s1 21.4 r1-s2 21.4 r2 21.4 r2-s1 21.4 r2-s2 22.1 22.1 r1 22.1 r1-s1 22.1 r1-s2 22.1 r2 22.1 r2-s1 22.2 22.2 r1 22.2 r1-s1 22.2 r1-s2 22.3 r1 22.4 r1

Affected range stops below 19.4R3-S10, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.2R3-S7, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.3R3-S6, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.4R3-S5, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.1R3-S4, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.2R3-S3, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.3R3-S3, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.4R3, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.1R3, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2R2, so it looks safe — our inference, not a vendor statement

juniper-qfx10000 (environment) · juniper-qfx10002 (environment) · juniper-qfx10002-32q (environment) · juniper-qfx10002-60c (environment) · juniper-qfx10002-72q (environment) · juniper-qfx10008 (environment) · juniper-qfx10016 (environment) · juniper-qfx10k (environment) · juniper-qfx3000-g (environment) · juniper-qfx3000-m (environment) · juniper-qfx3008-i (environment) · juniper-qfx3100 (environment) · juniper-qfx3500 (environment) · juniper-qfx3600 (environment) · juniper-qfx3600-i (environment) · juniper-qfx5100 (environment) · juniper-qfx5100-96s (environment) · juniper-qfx5110 (environment) · juniper-qfx5120 (environment) · juniper-qfx5130 (environment) · juniper-qfx5200 (environment) · juniper-qfx5200-32c (environment) · juniper-qfx5200-48y (environment) · juniper-qfx5210 (environment) · juniper-qfx5210-64c (environment) · juniper-qfx5220 (environment)

Qfx10000 · Juniperdevice

80%

All versions

Qfx10002 · Juniperdevice

80%

All versions

Qfx10002-32Q · Juniperdevice

80%

All versions

Qfx10002-60C · Juniperdevice

80%

All versions