CVE-2025-21594

CWE-7544 documents4 sources
Severity
8.7HIGH
EPSS
0.4%
top 39.17%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Juniper Networks Junos OSJuniper Junos
Timeline
PublishedApr 9

Description

An Improper Check for Unusual or Exceptional Conditions vulnerability in the pfe (packet forwarding engine) of Juniper Networks Junos OS on MX Series causes a port within a pool to be blocked leading to Denial of Service (DoS). In a DS-Lite (Dual-Stack Lite) and NAT (Network Address Translation) scenario, when crafted IPv6 traffic is received and prefix-length is set to 56, the ports assigned to the user will not be freed. Eventually, users cannot establish new connections. Affected FPC/PIC nee…

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L

Affected Packages2 packages

▶CVEListV5juniper_networks/junos_os21.4 — 21.4R3-S7+7
▶NVDjuniper/junos8 versions+7

🔴Vulnerability Details

2
CVEList
Junos OS: MX Series: In DS-lite and NAT scenario receipt of crafted IPv6 traffic causes port block↗2025-04-09
▶
GHSA
GHSA-393v-j9q3-p63r: An Improper Check for Unusual or Exceptional Conditions vulnerability in the pfe (packet forwarding engine) of Juniper Networks Junos OS on MX Series↗2025-04-09
▶

📋Vendor Advisories

1
Juniper
CVE-2025-21594: An Improper Check for Unusual or Exceptional Conditions vulnerability in the pfe (packet forwarding engine) of Juniper Networks Junos OS on MX Series↗2025-04-09
▶
CVE-2025-21594 (HIGH CVSS 8.7) | An Improper Check for Unusual or Ex | cvebase.io