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CVE-2024-39539

17
FAUCET Score

CVE-2024-39539 is a memory leak vulnerability affecting Juniper Networks Junos OS on MX Series devices. An unauthenticated, adjacent attacker can trigger a Denial-of-Service (DoS) by continuously logging in subscribers, leading to an FPC crash and restart. Rated Medium severity (CVSS 5.3), this vulnerability has an adjacent attack vector and high attack complexity, with a high impact on availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 21.2CPE matchmatch criteria
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
21.2CPE matchmatch criteria
cpe:2.3:o:juniper:junos:21.2:-:*:*:*:*:*:*
21.2CPE matchmatch criteria
cpe:2.3:o:juniper:junos:21.2:r1:*:*:*:*:*:*
21.2CPE matchmatch criteria
cpe:2.3:o:juniper:junos:21.2:r1-s1:*:*:*:*:*:*
21.2CPE matchmatch criteria
cpe:2.3:o:juniper:junos:21.2:r1-s2:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

6.0MEDIUM

CVSS:4.0/AV:A/AC:L/AT:P/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:X/V:X/RE:X/U:X

Attack Vector
ADJACENT
Attack Complexity
LOW
Attack Requirements
PRESENT
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
0.22%
Probability of exploitation in next 30 days
EPSS Percentile
12.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0022 is in the 4th percentile among its peer group of 1,749 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.0 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 / JSA82999
Vendor Advisory