CVE-2023-44191

Junos OS: QFX5000 Series and EX4000 Series: Denial of Service (DoS) on a large scale VLAN due to PFE hogging

HIGH

7.5

CVSS Score

Published: October 12, 2023 at 11:03 PM UTC

Updated: June 17, 2026 at 06:27 AM UTC

25 products affected across 2 vendorsJunosEx4600Ex2300

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Severity

HIGH7.5

Exploit prediction

EPSS 0.6%

SSVC

No known exploit

Description

An Allocation of Resources Without Limits or Throttling vulnerability in Juniper Networks Junos OS allows an unauthenticated, network-based attacker to cause Denial of Service (DoS). On all Junos OS QFX5000 Series and EX4000 Series platforms, when a high number of VLANs are configured, a specific DHCP packet will cause PFE hogging which will lead to dropping of socket connections. This issue affects: Juniper Networks Junos OS on QFX5000 Series and EX4000 Series * 21.1 versions prior to 21.1R3-S5; * 21.2 versions prior to 21.2R3-S5; * 21.3 versions prior to 21.3R3-S5; * 21.4 versions prior to 21.4R3-S4; * 22.1 versions prior to 22.1R3-S3; * 22.2 versions prior to 22.2R3-S1; * 22.3 versions prior to 22.3R2-S2, 22.3R3; * 22.4 versions prior to 22.4R2. This issue does not affect Juniper Networks Junos OS versions prior to 21.1R1

Affected

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

Junos · Juniper Networks

95%

v < 21.1r121.1 ≤ v < 21.1R3-S521.1 ≤ v < 21.1r3-s521.2 ≤ v < 21.2R3-S521.2 ≤ v < 21.2r3-s521.3 ≤ v < 21.3R3-S521.3 ≤ v < 21.3r3-s521.4 ≤ v < 21.4R3-S421.4 ≤ v < 21.4r3-s422.1 ≤ v < 22.1R3-S322.1 ≤ v < ss.1r3-s322.2 ≤ v < 22.2R3-S122.2 ≤ v < 22.2r3-s122.3 ≤ v < 22.3R2-S2, 22.3R322.3 ≤ v < 22.3r2-s222.4 ≤ v < 22.4R222.4 ≤ v < 22.4r221.1 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 21.1 r3-s4 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 21.2 r3-s3 21.2 r3-s4 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 21.3 r3-s3 21.3 r3-s4 21.4 21.4 r1 21.4 r1-s1 21.4 r1-s2 21.4 r2 21.4 r2-s1 21.4 r2-s2 21.4 r3 21.4 r3-s1 21.4 r3-s2 21.4 r3-s3 22.1 22.1 r1 22.1 r1-s1 22.1 r1-s2 22.1 r2 22.1 r2-s1 22.1 r2-s2 22.1 r3 22.1 r3-s1 22.1 r3-s2 22.2 22.2 r1 22.2 r1-s1 22.2 r1-s2 22.2 r3 22.3 22.3 r1 22.3 r1-s1 22.3 r1-s2 22.3 r2 22.3 r2-s1 22.4 22.4 r1 22.4 r1-s1 22.4 r1-s2

Vendor states this is fixed in 21.1R1 (unaffected)

Affected range stops below 21.1R3-S5, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.2R3-S5, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.3R3-S5, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.4R3-S4, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.1R3-S3, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2R3-S1, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.3R2-S2, 22.3R3, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.3r2-s2, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.4R2, so it looks safe — our inference, not a vendor statement

Affected range stops below ss.1r3-s3, so it looks safe — our inference, not a vendor statement

juniper-ex2300 (environment) · juniper-ex2300-c (environment) · juniper-ex2300-multigigabit (environment) · juniper-ex3400 (environment) · juniper-ex4100 (environment) · juniper-ex4100-f (environment) · juniper-ex4100-multigigabit (environment) · juniper-ex4300 (environment) · juniper-ex4300-multigigabit (environment) · juniper-ex4400 (environment) · juniper-ex4400-24x (environment) · juniper-ex4400-multigigabit (environment) · juniper-ex4600 (environment) · juniper-ex4650 (environment) · juniper-ex9200 (environment) · juniper-ex9250 (environment) · juniper-qfk5110 (environment) · juniper-qfk5120 (environment) · juniper-qfk5130 (environment) · juniper-qfk5200 (environment) · juniper-qfk5210 (environment) · juniper-qfk5220 (environment) · juniper-qfk5230 (environment) · juniper-qfk5700 (environment)

Ex2300 · Juniperdevice

80%

All versions

Ex2300-C · Juniperdevice

80%

All versions

Ex2300 Multigigabit · Juniperdevice

80%

All versions

Ex3400 · Juniperdevice

80%

All versions