Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2024-39526

Severity CVSS v4.0:
HIGH
Type:
Unavailable / Other
Publication date:
11/10/2024
Last modified:
23/01/2026

Description

An Improper Handling of Exceptional Conditions vulnerability in packet processing of Juniper Networks Junos OS on MX Series with MPC10/MPC11/LC9600 line cards, EX9200 with EX9200-15C lines cards, MX304 devices, and Juniper Networks Junos OS Evolved on PTX Series, allows an attacker sending malformed DHCP packets to cause ingress packet processing to stop, leading to a Denial of Service (DoS).  Continued receipt and processing of these packets will create a sustained Denial of Service (DoS) condition.<br /> <br /> This issue only occurs if DHCP snooping is enabled. See configuration below.<br /> <br /> This issue can be detected using following commands. Their output will display the interface status going down:<br /> <br /> <br /> user@device&gt;show interfaces <br /> user@device&gt;show log messages | match <br /> user@device&gt;show log messages ==&gt; will display the "[Error] Wedge-Detect : Host Loopback Wedge Detected: PFE: no," logs.<br /> <br /> This issue affects:<br /> Junos OS on <br /> <br /> MX Series <br /> <br /> with MPC10/MPC11/LC9600 line cards, EX9200 with EX9200-15C line cards, and MX304: <br /> <br /> <br /> * All versions before 21.2R3-S7, <br /> * from 21.4 before 21.4R3-S6, <br /> * from 22.2 before 22.2R3-S3, <br /> * all versions of 22.3,<br /> * from 22.4 before 22.4R3, <br /> * from 23.2 before 23.2R2; <br /> <br /> <br /> <br /> Junos OS Evolved on PTX Series: <br /> * from 19.3R1-EVO before 21.2R3-S8-EVO,<br /> <br /> * from 21.4-EVO before 21.4R3-S7-EVO, <br /> * from 22.1-EVO before 22.1R3-S6-EVO, <br /> * from 22.2-EVO before 22.2R3-S5-EVO, <br /> * from 22.3-EVO before 22.3R3-S3-EVO, <br /> * from 22.4-EVO before 22.4R3-S1-EVO, <br /> * from 23.2-EVO before 23.2R2-S2-EVO, <br /> * from 23.4-EVO before 23.4R2-EVO.<br /> <br /> <br /> <br /> Junos OS Evolved releases prior to 19.3R1-EVO are unaffected by this vulnerability

Impact

Vector 4.0
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/R:U CVSS v4.0 Severity and Metrics:

Base Score: 7.10 HIGH
Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/R:U

Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Attack Requirements (AT): None
Privileges Required (PR): None
User Interaction (UI): None
Confidentiality (VC): None
Integrity (VI): None
Availability (VA): High
Confidentiality (SC): None
Integrity (SI): None
Availability (SA): Low
Recovery (R): User

Base Score 4.0
7.10
Severity 4.0
HIGH
Vector 3.x
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 6.50 MEDIUM
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
6.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* 21.2 (excluding)
cpe:2.3:o:juniper:junos:21.2:-:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r1-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r1-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r2-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r2-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r3-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r3-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r3-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r3-s4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r3-s5:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:21.2:r3-s6:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools