CVE-2024-39526
Junos OS and Junos OS Evolved: MX Series with MPC10/MPC11/LC9600, MX304, EX9200, PTX Series: Receipt of malformed DHCP packets causes interfaces to stop processing packets
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.
This issue only occurs if DHCP snooping is enabled. See configuration below.
This issue can be detected using following commands. Their output will display the interface status going down:
user@device>show interfaces <if--x/x/x> user@device>show log messages | match <if--x/x/x> user@device>show log messages ==> will display the "[Error] Wedge-Detect : Host Loopback Wedge Detected: PFE: no," logs.
This issue affects: Junos OS on
MX Series
with MPC10/MPC11/LC9600 line cards, EX9200 with EX9200-15C line cards, and MX304:
- All versions before 21.2R3-S7,
- from 21.4 before 21.4R3-S6,
- from 22.2 before 22.2R3-S3,
- all versions of 22.3,
- from 22.4 before 22.4R3,
- from 23.2 before 23.2R2;
Junos OS Evolved on PTX Series:
-
from 19.3R1-EVO before 21.2R3-S8-EVO,
-
from 21.4-EVO before 21.4R3-S7-EVO,
-
from 22.1-EVO before 22.1R3-S6-EVO,
-
from 22.2-EVO before 22.2R3-S5-EVO,
-
from 22.3-EVO before 22.3R3-S3-EVO,
-
from 22.4-EVO before 22.4R3-S1-EVO,
-
from 23.2-EVO before 23.2R2-S2-EVO,
-
from 23.4-EVO before 23.4R2-EVO.
Junos OS Evolved releases prior to 19.3R1-EVO are unaffected by this vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Adjacent network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Junos OS and Junos OS Evolved: MX Series with MPC10/MPC11/LC9600, MX304, EX9200, PTX Series: Receipt of malformed DHCP packets causes interfaces to stop processing packets
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.
This issue only occurs if DHCP snooping is enabled. See configuration below.
This issue can be detected using following commands. Their output will display the interface status going down:
user@device>show interfaces <if--x/x/x> user@device>show log messages | match <if--x/x/x> user@device>show log messages ==> will display the "[Error] Wedge-Detect : Host Loopback Wedge Detected: PFE: no," logs.
This issue affects: Junos OS on
MX Series
with MPC10/MPC11/LC9600 line cards, EX9200 with EX9200-15C line cards, and MX304:
- All versions before 21.2R3-S7,
- from 21.4 before 21.4R3-S6,
- from 22.2 before 22.2R3-S3,
- all versions of 22.3,
- from 22.4 before 22.4R3,
- from 23.2 before 23.2R2;
Junos OS Evolved on PTX Series:
-
from 19.3R1-EVO before 21.2R3-S8-EVO,
-
from 21.4-EVO before 21.4R3-S7-EVO,
-
from 22.1-EVO before 22.1R3-S6-EVO,
-
from 22.2-EVO before 22.2R3-S5-EVO,
-
from 22.3-EVO before 22.3R3-S3-EVO,
-
from 22.4-EVO before 22.4R3-S1-EVO,
-
from 23.2-EVO before 23.2R2-S2-EVO,
-
from 23.4-EVO before 23.4R2-EVO.
Junos OS Evolved releases prior to 19.3R1-EVO are unaffected by this vulnerability
- Record
CVE-2024-39526- CVSS 4.0
- 7.1 High
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 3.1
- 6.5 Medium
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-755
- Updated
- 2026-11-02
EUVDEUVD-2024-38052
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.
This issue only occurs if DHCP snooping is enabled. See configuration below.
This issue can be detected using following commands. Their output will display the interface status going down:
user@device>show interfaces <if--x/x/x> user@device>show log messages | match <if--x/x/x> user@device>show log messages ==> will display the "[Error] Wedge-Detect : Host Loopback Wedge Detected: PFE: no," logs.
This issue affects: Junos OS on
MX Series
with MPC10/MPC11/LC9600 line cards, EX9200 with EX9200-15C line cards, and MX304:
- All versions before 21.2R3-S7,
- from 21.4 before 21.4R3-S6,
- from 22.2 before 22.2R3-S3,
- all versions of 22.3,
- from 22.4 before 22.4R3,
- from 23.2 before 23.2R2;
Junos OS Evolved on PTX Series:
-
from 19.3R1-EVO before 21.2R3-S8-EVO,
-
from 21.4-EVO before 21.4R3-S7-EVO,
-
from 22.1-EVO before 22.1R3-S6-EVO,
-
from 22.2-EVO before 22.2R3-S5-EVO,
-
from 22.3-EVO before 22.3R3-S3-EVO,
-
from 22.4-EVO before 22.4R3-S1-EVO,
-
from 23.2-EVO before 23.2R2-S2-EVO,
-
from 23.4-EVO before 23.4R2-EVO.
Junos OS Evolved releases prior to 19.3R1-EVO are unaffected by this vulnerability
- Record
EUVD-2024-38052- CVSS 4.0
- 7.1 High
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 - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-qxf5-vpwf-vj9q
An Improper Handling of Exceptional Conditions vulnerability in packet processing of Juniper...
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.
This issue only occurs if DHCP snooping is enabled. See configuration below.
This issue can be detected using following commands. Their output will display the interface status going down:
user@device>show interfaces <if--x/x/x> user@device>show log messages | match <if--x/x/x> user@device>show log messages ==> will display the "[Error] Wedge-Detect : Host Loopback Wedge Detected: PFE: no," logs.
This issue affects: Junos OS on
MX Series
with MPC10/MPC11/LC9600 line cards, EX9200 with EX9200-15C line cards, and MX304:
- All versions before 21.2R3-S7,
- from 21.4 before 21.4R3-S6,
- from 22.2 before 22.2R3-S3,
- all versions of 22.3,
- from 22.4 before 22.4R3,
- from 23.2 before 23.2R2;
Junos OS Evolved on PTX Series:
-
from 19.3R1-EVO before 21.2R3-S8-EVO,
-
from 21.4-EVO before 21.4R3-S7-EVO,
-
from 22.1-EVO before 22.1R3-S6-EVO,
-
from 22.2-EVO before 22.2R3-S5-EVO,
-
from 22.3-EVO before 22.3R3-S3-EVO,
-
from 22.4-EVO before 22.4R3-S1-EVO,
-
from 23.2-EVO before 23.2R2-S2-EVO,
-
from 23.4-EVO before 23.4R2-EVO.
Junos OS Evolved releases prior to 19.3R1-EVO are unaffected by this vulnerability
- Record
GHSA-qxf5-vpwf-vj9q- CVSS 4.0
- 7.1 High
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:U/V:X/RE:X/U:X - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-755
- Updated
- 2026-11-02
NVD
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.
This issue only occurs if DHCP snooping is enabled. See configuration below.
This issue can be detected using following commands. Their output will display the interface status going down:
user@device>show interfaces <if--x/x/x> user@device>show log messages | match <if--x/x/x> user@device>show log messages ==> will display the "[Error] Wedge-Detect : Host Loopback Wedge Detected: PFE: no," logs.
This issue affects: Junos OS on
MX Series
with MPC10/MPC11/LC9600 line cards, EX9200 with EX9200-15C line cards, and MX304:
- All versions before 21.2R3-S7,
- from 21.4 before 21.4R3-S6,
- from 22.2 before 22.2R3-S3,
- all versions of 22.3,
- from 22.4 before 22.4R3,
- from 23.2 before 23.2R2;
Junos OS Evolved on PTX Series:
-
from 19.3R1-EVO before 21.2R3-S8-EVO,
-
from 21.4-EVO before 21.4R3-S7-EVO,
-
from 22.1-EVO before 22.1R3-S6-EVO,
-
from 22.2-EVO before 22.2R3-S5-EVO,
-
from 22.3-EVO before 22.3R3-S3-EVO,
-
from 22.4-EVO before 22.4R3-S1-EVO,
-
from 23.2-EVO before 23.2R2-S2-EVO,
-
from 23.4-EVO before 23.4R2-EVO.
Junos OS Evolved releases prior to 19.3R1-EVO are unaffected by this vulnerability
- Record
CVE-2024-39526- CVSS 4.0
- 7.1 High
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:U/V:X/RE:X/U:X - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-755
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2024-39526 is a high vulnerability (CVSS 7.1) in Juniper Junos, published October 11, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.37%, the 30th percentile. No source names a fixed version.