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CVE-2024-39526

22
FAUCET Score

CVE-2024-39526 is an Improper Handling of Exceptional Conditions vulnerability affecting Juniper Networks Junos OS on MX Series, EX9200, and MX304 devices, and Junos OS Evolved on PTX Series, specifically when DHCP snooping is enabled. An attacker can send malformed DHCP packets to cause ingress packet processing to stop, leading to a sustained Denial of Service (DoS) condition. With a CVSS score of 6.5 (Medium), this vulnerability has an adjacent attack vector and low attack complexity, resulting in high availability impact. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 19.4, < 21.2CPE matchmatch criteria
cpe:2.3:o:juniper:junos_os_evolved:*:*:*:*:*:*:*:*
19.3CPE matchmatch criteria
cpe:2.3:o:juniper:junos_os_evolved:19.3:r1:*:*:*:*:*:*
19.3CPE matchmatch criteria
cpe:2.3:o:juniper:junos_os_evolved:19.3:r2:*:*:*:*:*:*
21.2CPE matchmatch criteria
cpe:2.3:o:juniper:junos_os_evolved:21.2:-:*:*:*:*:*:*
21.2CPE matchmatch criteria
cpe:2.3:o:juniper:junos_os_evolved:21.2:r1:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

7.1HIGH

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

Attack Vector
ADJACENT
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
LOW
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.37%
Probability of exploitation in next 30 days
EPSS Percentile
29.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0037 is in the 43rd percentile among its peer group of 1,802 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

supportportal.juniper.net / JSA88103
Vendor Advisory